Jose X Chaparro

Jose X Chaparro
University of Florida | UF · Department of Horticultural Sciences

About

136
Publications
12,475
Reads
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1,106
Citations
Introduction
Additional affiliations
June 2004 - present
University of Florida
Position
  • Professor (Associate)
Description
  • Breeding of Stonefruit and Citrus.

Publications

Publications (136)
Article
Full-text available
Aims The effect of flooding on carbohydrate and nitrogen metabolism in leaves of peach (Prunus persica cv. UFSun) trees grafted onto six different Prunus spp. rootstock cultivars with either peach or plum parentage (peach: ‘Flordaguard’, ‘Guardian’, ‘Nemaguard’, ‘P-22’; plum: ‘R5064–5’, and ‘MP-29’) were evaluated. Methods Young peach trees were d...
Article
Full-text available
Traditionally, peach rootstocks are propagated by seeds due to their high availability, low cost, and easy storage and handling. However, stem cuttings allow the propagation of interspecific hybrids and keep the genetic uniformity of heterozygous genotypes. This study compared the effect of four different concentrations of K-IBA (indole-3-butyric a...
Article
Full-text available
The goal of this publication is to provide a practical guideline for irrigation of young (1–3 years old) and adult (>3 years old) peach trees cultivated in Florida. This document is based on field research of peach water uptake conducted by UF/IFAS. The first section describes peach tree growth stages and their respective crop water demand in centr...
Article
Full-text available
Cultivar Flordaguard is suggested as a root-knot nematode (RKN) resistant rootstock for Florida peaches, however, RKN disease has been observed on this rootstock in peach orchards. Our goal was to confirm whether the RKN resistance breaking isolates of M. floridensis and M. arenaria indeed could infect and reproduce on the peach rootstock cv. Flord...
Chapter
Full-text available
North America is a center of diversity for Prunus species. Tree architecture, chilling requirement, heat requirement, fruit development period, fruit size, fruit texture, disease resistance, and adaptive changes to multiple environmental conditions are a few examples of the traits of which tremendous genetic variability is available in the native p...
Article
Low-chill peach [Prunus persica (L.) Batsch] cultivars allow Florida growers to become competitive by offering fruits earlier than northern states for premium prices. Due to the predominance of sandy soils in Florida, irrigation is required to ensure fruit production in peaches. Available irrigation recommendations and peach crop coefficients (Kc)...
Article
In the southern USA, low soil water holding capacity and erratic rainfall patterns create scenarios where plant water stress may occur, reducing early peach tree growth. Therefore, irrigation management is a key component to ensure adequate water supply during early tree growth stages. The objective of this study was to determine water requirements...
Article
Full-text available
The rootstock is an essential element for orchard management, influencing scion growth, nutrient concentration, and fruit quality. Seasonal variations in leaf nutrients of ‘UFSun’ grafted on five different rootstocks (‘Flordaguard’, ‘Barton’, ‘MP-29’, ‘P-22’, and ‘Okinawa’) were investigated during the 2017–18 growing season in Citra, FL. There was...
Article
Full-text available
The primary focus of the stone fruit rootstock program at Byron, GA, has been the development of disease-resistant rootstocks for peach ( Prunus persica L. Batsch). Historically peach tree short life (PTSL), aka bacterial canker complex, and Armillaria root rot (ARR) have been the two most important causes of premature mortality of commercial peach...
Article
The peach root‐knot nematode, Meloidogyne floridensis (MF), infects majority of available nematode‐resistant peach rootstocks which are mostly derived from peach (Prunus persica) and Chinese wild peach (P. davidiana). Interspecific hybridization of peach with its wild relative, Kansu peach (P. kansuensis), offers potential for broadening the resist...
Article
Full-text available
Most commercially important rootstocks for peach [Prunus persica (L.) Batsch] had been selected for resistance to one or more of the root-knot nematode (RKN) species: Meloidogyne incognita, M. arenaria, and M. javanica. The peach root-knot nematode, M. floridensis (MF), is a relatively newly discovered threat to peach and is not controlled by resis...
Article
This 6-page document provides basic information and guidelines on water requirements and irrigation strategies for peaches grown in Florida. Written by C. Zambrano-Vaca, L. Zotarelli, K. Migliaccio, R. Beeson Jr., K. Morgan, J. Chaparro, and M. Olmstead and published by the UF/IFAS Horticultural Sciences Department, April 2018. http://edis.ifas.ufl...
Article
Full-text available
Species in the fungal family Botryosphaeriaceae are significant pathogens of peach. The climatic conditions in the Southeastern USA are conducive to the development of peach fungal gummosis (PFG) with an estimated yield reduction of up to 40% in severe cases. Genotypes with resistance to this PFG were identified in interspecific crosses and segrega...
Article
Full-text available
Breeding programs of cacao (Theobroma cacao L.) trees share the many challenges of breeding long-living perennial crops, and genetic progress is further constrained by both the limited understanding of the inheritance of complex traits and the prevalence of technical issues, such as mislabeled individuals (off-types). To better understand the genet...
Data
Pedigree of trees including off-types in PT08.
Data
96 SNP off-typing markers for cacao.
Article
Full-text available
Prunus phylogeny has been extensively studied using chloroplast DNA (cpDNA) sequences. Chloroplast DNA has a slow rate of evolution, which is beneficial to determine species relationships at a deeper level. The chloroplast-based phylogenies have a limitation due to the transfer of this organelle by interspecific hybridization. This creates difficul...
Patent
Full-text available
‘UFGem’ is a new and distinct variety of peach tree that has an estimated winter chilling requirement of 175 chill units. The tree is of large size and is highly vigorous with a semi-upright growth habit. Flowers are showy and pink and leaf glands are small and reniform. Trees are self-fertile and regularly bear heavy annual crops of early-season f...
Article
Full-text available
To identify and evaluate self-incompatible alleles in almonds and related germplasm, DNAfrom 15 Prunus species was amplified using two degenerate consensus primer pairs flanking first and second S-locus introns (PaConsI-FD-EMPc1ConsRD and EM-Pc2ConsFD-EM-Pc3ConsRD). Twenty-eight amplified PCR products were analyzed by automated sequencer capillary...
Conference Paper
The peach (Prunus persica) cultivar ‘Flordaguard’ is the predominant rootstock for peach production in Florida. It is effective as a rootstock due to its low-chill requirement and ability to withstand infection by the endemic peach root-knot nematode (RKN), Meloidogyne floridensis (Mf). The RMia gene present in the rootstocks ‘Nemared,’ ‘Nemaguard,...
Article
Commercial peach is a highly homozygous self-compatible species with limited diversity. The incorporation of exotic germplasm and breeding of new varieties is hindered by the labor required to generate large segregating populations. Hand pollinations are characterized by a high failure rate with only 25% of pollinations resulting in fruit set. Addi...
Article
The primary focus of the stone fruit rootstock program at Byron, Georgia has been the development of disease resistant rootstocks for peach. Historically peach tree short life (PTSL), aka 'Bacterial Canker Complex', and Armillaria root rot (ARR) have been the two most important causes of premature mortality of commercial peach trees in the southeas...
Article
The Southeastern US peach industry is concentrated in two production areas, i.e., central Georgia/South Carolina (high chill, main season) and the Lower Coastal Plain (moderate chill, early season) along the Gulf coast. These two areas have distinctly different climates and, consequently, require different priorities for the breeding of new peach c...
Patent
Full-text available
A new and distinct variety of peach tree, denominated ‘Gulfsnow’, has a winter chilling requirement estimated at 400 chill units (cu). The tree is medium size, moderately vigorous, and semi-upright in growth habit. It bears showy, pink flowers, and leaves with globose glands. Trees of ‘Gulfsnow’ are self-fertile and regularly bear annual crops of e...
Article
Full-text available
Huanglongbing (HLB) is severely impacting Florida citrus. Productivity declines in many HLB-affected genotypes are often accompanied with thinned canopies, and reduced fruit size and quality. Development of citrus cultivars resistant or tolerant to HLB is the best long-term control solution for this endemic disease in Florida. HLB was assessed in d...
Patent
Full-text available
‘UFBest’ is a new and distinct variety of peach tree which has a winter chilling requirement slightly less than 100 chill units. The tree is of large size and is highly vigorous with a semi-spreading growth habit. Flowers are showy and pink and leaf glands are small and reniform in shape. Trees are self fertile and regularly bear heavy annual crops...
Article
Full-text available
Peach is a self-pollinated species with a high level of linkage disequilibrium (LD) conservation for North American and European commercial varieties, LD~13-15cM. The analysis of the University of Florida peach germplasm founding clones, previous releases, and present selections, constitutes the main objective of this report. A total of 198 peach g...
Conference Paper
Peach production acreage in Central Florida is steadily expanding with the availability of new, high-quality, and low-chill requirement peach cultivars adapted to the region’s subtropical climate. Florida’s well-drained sandy soils are ideal for peach production except that they are also inhabited by plant pathogenic nematodes. ‘Flordaguard’ peach...
Conference Paper
Prunus umbellata is a diploid plum species native to the Southern US with a wide geographic range and adaptation to different soils and environments. Other species native to the Southern US include P. americana Marsh., P. angustifolia Marsh., and P. geniculata Harper. The objective of this research was to evaluate P. umbellata as a model plant for...
Conference Paper
The primary focus of the USDA-ARS stone fruit rootstock program at Byron, Georgia has been the development of disease resistant rootstocks for peach. Historically peach tree short life (PTSL), aka ‘Bacterial Canker Complex’, and Armillaria root rot (ARR) have been the two most important causes of premature mortality of commercial peach trees in the...
Conference Paper
The fresh citrus industry in Florida is currently under strong pressure from diseases such as citrus greening (HLB) and canker. While Citrus scab does not pose as severe a threat to the citrus industry as HLB, it does represent a challenge to fresh fruit producers. Citrus scab disease, characterized by the production of hardened scab like lesions o...
Conference Paper
Most citrus rootstocks are clonally propagated via seed in Florida. Citrus rootstocks are typically selected to have high levels of nucellar embryony, a type ofP apomixis, to ensure that propagation is true to type. The spread of the Huang-Long-Bing disease in Florida has significantly increased the demand of citrus rootstocks for the propagation o...
Conference Paper
Peach trees in the Southeastern United States are damaged by fungal gummosis (incited by Botryosphaeria dothidea [(Moug.:Fr.) Ces. & De Not.] with a fruit yield reduction up to 40% per tree in severe cases. Previous studies indicated a high level of susceptibility in commercially recommended rootstocks and cultivars. The climatic conditions in the...
Conference Paper
The genus Prunus L. constitutes approximately 200 species distributed worldwide. Plums, cherries, almonds, apricots, and peaches belong to this genus. North America is a center of diversity for the genus Prunus. The phylogeny of the North American plums has been previously studied using chloroplast DNA (cpDNA) and internal transcribed spacer region...
Article
Tree size and branching control has gained importance as labor and pruning costs have increased. In addition, the occurrence of blind nodes is a critical factor that affects peach tree architecture and productivity in subtropical climates. Seven backcross families segregating for branching and blind nodes were developed using 'Flordaguard' peach ×...
Conference Paper
North America is a center of diversity for Prunus L. species. The University of Florida Stone Fruit Breeding and Genetics Program in collaboration with the National Germplasm Repository and USDA–ARS (Project No. 5306-21000-018-00D) collected and identified ~400 genotypes of approx. 30 taxa native to the United States. A core collection of 13 specie...
Conference Paper
North America is an important center of diversity for plum species. The North American plums grow in diverse climatic and geographic regions. High levels of variation for plant architecture, fruit size, flesh texture, flesh color, disease resistance, chilling requirement, and other traits, have been reported. The survival of several of these specie...
Article
Dormancy is a condition that delays or inhibits growth in seed, vegetative buds, and floral buds. In peach, seed germination occurs when seed accumulate sufficient stratification and growing degree hours to break dormancy and begin growing. Correlations have been reported between mean seed stratification requirements and mean bud chilling requireme...
Patent
Full-text available
A new and distinct peach rootstock ‘MP-29’, which is an interspecific hybrid rootstock Prunus species hybrid×Prunus persica, which was developed for use as a clonal commercial rootstock under peach cultivars. It is distinguished by its resistance to peach tree short life/bacterial canker complex, Armillaria root rot, and to several species of root-...
Article
Double flowering in peach [Prunus persica (L.) Batsch] has long been thought to be controlled solely by a single recessive gene (Di/di). Several hybrid populations were generated utilizing sources tracing to a single double flowered phenotype. Evidence is presented for two loci controlling double flowers. The first is the known single gene recessiv...
Article
Mapping of traits in peach is hindered by the low heterozygocity encountered in peach × peach crosses. Typical heterozygocity rates in peach × peach crosses are in the range of 25-35% percent. The use of interspecific hybrids greatly increases the number of heterozygous markers in F1 hybrids and facilitates the making of genomic maps without blind...
Article
Dormancy is a condition that delays or inhibits growth in seed, vegetative buds, and floral buds. Growth resumes in vegetative and floral buds after winter bud dormancy has been met by the accumulation of chilling hours and heat units necessary to break endodormancy and ecodormancy, respectively. Seed germination occurs after seed dormancy has been...
Article
Little is known about the genetic diversity of low- and mid-chill peach germplasm. Microsatellite markers offer a powerful tool for measuring genetic diversity. A set of 53 genotypes representing cultivars and selections from the low and mid-chill breeding programs and 5 cultivars from the high-chill peach breeding program at North Carolina State U...
Article
Blind nodes are a common problem in peach cultivars planted in subtropical areas. Little is known about the incidence of blind nodes in interspecific hybrids of peach × almond and peach × P. kansuensis, and the patterns of segregation in subsequent generations. F1, F2 and backcrosses populations were evaluated in regard to blind node frequency in G...
Article
Several populations of peach [Prunus persica (L.) Batsch] seedlings in the Southeastern United States moderate chill peach cultivar development program were observed to produce a stunted phenotype that displayed pre-mature defoliation. Early defoliating seedlings displayed chlorotic leaves which abscised prior to reaching full size. These populatio...
Conference Paper
The Prunus L. genus belongs to the subfamily Amygdaloideae (=Prunoideae) of the Rosaceae family. It is distributed around the world, with approximately 200 species. Species native to southeastern United States include P. americana Marsh., P. angustifolia Marsh., P. geniculata Harper, and P. umbellata Elliot. The existence of several wild plum speci...
Conference Paper
White flower color is controlled by a recessive allele w in peach. To map the W locus, open pollinated seed were collected from two different F1 hybrids. The first hybrid was an F1 between ‘White English’ ww (white flower) and ‘UFSun’ WW (pink flower). The second a hybrid was an F1 between ‘Brooks’ ww (white flower) and ‘UFBeauty’ WW (pink flower)....
Conference Paper
The genus Prunus L. is economically important source of fruit such as plums, cherries, almonds, apricots and peaches. Grafting techniques are commonly used to propagate superior commercial cultivars. The desired scion genotype is grafted onto a rootstock. Native wild Prunus species have been previously used as rootstocks for grafting commercial cul...
Conference Paper
North America is a center of diversity for Prunus species. Tree architecture, endodormancy requirement, heat requirement, fruit development period, fruit size, fruit texture, fruit flesh, disease resistance, and adaptive changes to multiple environmental conditions, are a few examples of the tremendous genetic variability available in the plum germ...
Conference Paper
Evaluation of Taiwan Cherry (Prunus campanulata) germplasm for the breeding of subtropical sweet cherries has identified two Mendelian traits. A genotype possessing standard five petal flowers of white color was hybridized with a pink colored multi-petal (10–25 petals) flowered genotype. All hybrids had pink flowers with approximately half processi...
Conference Paper
The genetic variation in commercial peach germplasm is low. Closely related species such as Prunus dulcis (almond), P. kansuensis (kansu peach) and P. davidiana (davids peach) represent valuable sources of genetic variation. These species have been used to a limited extent in rootstock breeding but have been largely ignored in scion breeding. The r...
Article
Full-text available
Almond is one of the most important nut crops in the world. The origin of almond is central and west Asia. About 30 wild species are identified in this region which represent a rich source of desirable characteristics useful in almond breeding programs. However, almonds express gametophytic self- and cross-incompatibility which affects breeding par...
Article
Full-text available
Wild Almond species are classified in Prunus genus and Amygdalus subgenus and 2 series of Icosandrae and Dodecandra. In the first classifications of Iranian wild almonds, their species were classified based on the thorn characteristics of branches, petiole length and leaf blade shape and size. Wild almond species in different ecological regions pos...
Article
Full-text available
Iran is considered the center of origin for many plant genetic resources of the world. Twenty one wild species of the Amygdalus have been identified in Iran, of which ten are supposed to be endemic species. In the first experiment, GA3 (0, 250, 500, 750 ppm) was applied for 24 hours on four accessions of wild almond seeds and then stratified at 5°C...
Conference Paper
Citrus kinokuni ‘Mukaku kishu’ PI539530 and its progeny were studied to identify RAPD markers associated with seedless trait. A hybrid population consisting of ninety-one F1 [(Robinson op) × C. kinokuni] individuals showed a 1:1 phenotypic segregation ratio between seedless and seeded phenotypes, with seedless behaving as a single dominant gene. Bu...
Conference Paper
The diploid strawberry (Fragaria vesca) is an attractive system for research, but also for teaching students about plant science. It has a tiny sequenced genome, it grows in minimal space, and findings are relatable to other members of the Rosaceae. Most of all, it produces strawberries, small pods of flavor and aroma reminiscent of the familiar de...
Conference Paper
As labor and pruning costs of fruit trees have increased, the importance of size control and tree architecture has gained importance. Tree architecture will continue to increase in importance as a major trait for tree fruit breeders. Numerous growth forms have been described in peach including, dwarf, compact, weeping, and pillar, however, little e...
Conference Paper
Peach is one of a few tree species capable of generating haploids. Haploidy represents an important tool for the rapid generation of homozygous genotypes in peach breeding programs. The potential impact is even greater in the case of peach rootstocks where it takes multiple generations to develop inbred lines that come true to seed. Spontaneous pea...
Conference Paper
Chilling requirement is the primary determinant of a peach cultivar’s zone of adaptation. The chilling requirement is defined as the number of hours below 7 °C needed by flower and vegetative buds to overcome endodormancy. A peach cultivar’s chilling requirement determines its bloom date and cropping potential. Within a location, cultivars with low...
Article
Full-text available
Iran is an important area for the gene pool of almonds. It has been suggested that Amygdalus communis spread from Iran, Caucasia and the South of Turkey to Syria, Lebanon and Jordan. So far, 21 wild species and 7 inter-species hybrids have been identified in Iran, of which ten are supposed endemic species. Wild almond species have been used traditi...
Article
Full-text available
Wild almond species are important genetic resources for resistance to unsuitable condition, especially drought stress. They have been used traditionally as rootstocks in some areas of Iran. So far, 21 wild almond species and 7 inter species hybrids have been identified in Iran. To study seed germination and seedling establishment of some of these s...
Article
Full-text available
Citrus kinokuni 'Mukaku kishu' PI539530 and its progeny were studied to identify random amplified polymorphic DNA (RAPD) primers associated with seedlessness. Ninety-one F1 [(Robinson op) ×C. kinokuni] individuals showed a 1:1 segregation ratio between seedless and seeded phenotypes with seedless as a single dominant gene. Bulked segregant analysis...
Article
Full-text available
Phytophthora capsici causes seedling death, crown and root rot, fruit rot, and foliar blight on squash and pumpkins (Cucurbita spp. L.). A total of 119 C. moschata accessions, from 39 geographic locations throughout the world, and a highly susceptible butternut squash cultivar, Butterbush, were inoculated with a suspension of three highly virulent...
Article
Full-text available
Almond and its related wild species, which are widely distributed in Central and West Asia, have high genetic variation. This is an important source of genetic diversity for crop improvement. In this study a set of 32 SSR and 12 EST-SSR primer pairs were used to determine genetic diversity in 89 accessions of almond and other Prunus species. Most o...
Article
Full-text available
Wild almond genotypes are a rich source of desirable characteristics which can be useful to almond breeding programs. However, almonds express self-incompatibility which affects breeding parent selection. Self-incompatibility is controlled by a multi-allelic, single gene (S-locus). Here, the S-alleles were studied in 96 wild almonds and related Pru...
Article
Full-text available
Trees without excessive branching are desirable for the reduction of pruning costs. Genetic diversity for less twiggy genotypes exists in peach and a branching index was developed for evaluation and selection of genotypes with reduced branching. The index is based on the number of total first-order branches and the number of second-order, third-ord...
Article
'UFOne' peach [Prunus persica (L.) Batsch] is released for grower trials in central and north central Florida by the University of Florida Agricultural Experiment Station. Trees of 'UFOne' produce an attractive, sweet tasting, yellow and non-melting flesh, cling stone fruit intended for the fresh fruit market.
Article
'UFRoyal' nectarine, [Prumus persica (L) Batsch], is released for grower trial in north central Florida by the Florida Agricultural Experiment Station. This nectarine cultivar is intended as a replacement for ''Sunraycer' nectarine. Trees of 'UFRoyal' produce in attractive, sweet tasting. yellow and non-melting flesh. clingstone nectarine intended...
Article
The effect of climate was observed on fruit quality of four low-chill peach cultivars (Flordaprince, Flordaglo, UFGold, and TropicBeauty). The cultivars were evaluated in three locations (north-central, central, and southwest Florida). Soluble solids content (SSC), titratable acidity (TA), SSC:TA ratio, fruit weight, blush, and fruit development pe...
Article
When considering a broad cross section of climates and growing regions, the peach (Prunus persica (L) Batsch) is the most prevalent of the stonefruits, rivaling apple in terms of adaptation. The broad distribution reflects its extensive cultivation, as its prized fruits drove its rapid dissemination and selection for adaptation to new areas. The re...