Gustavo A. Lobos

Gustavo A. Lobos
Universidad de Talca · Department of Horticulture

PhD

About

76
Publications
77,789
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1,322
Citations
Citations since 2016
30 Research Items
1084 Citations
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2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250

Publications

Publications (76)
Article
Full-text available
Latin America and the Caribbean (LAC) has long been associated with the production and export of a diverse range of agricultural commodities. Due to its strategic geographic location, which encompasses a wide range of climates, it is possible to produce almost any crop. The climate diversity in LAC is a major factor in its agricultural potential bu...
Article
Full-text available
Today, blueberries are recognized worldwide as one of the foremost health foods, becoming one of the crops with the highest productive and commercial projections. Over the last 100 years, the geographical area where highbush blueberries are grown has extended dramatically into hotter and drier environments. The expansion of highbush blueberry growi...
Article
A collection of 368 advanced lines and cultivars of spring wheat (Triticum aestivum L.) from Chile, Uruguay and CIMMYT, with good agronomic characteristics were evaluated under the Mediterranean conditions of central Chile. Three different water regimes were assayed: severe water stress (SWS, rainfed), mild water stress (MWS; one irrigation around...
Article
Full-text available
Fresh blueberries are prone to softening and dehydration during postharvest, which limits their competitiveness when reaching the final markets. Commercial cultivars 'Duke' and 'Brigitta' exhibit contrasting softening patterns. Although 'Duke' berries usually show higher firmness levels at harvest as compared to 'Brigitta', they display higher soft...
Chapter
Due to climate change and expected food shortage in the coming decades, not only will it be necessary to develop cultivars with greater tolerance to environmental stress, but it is also imperative to reduce breeding cycle time. In addition to yield evaluation, plant breeders resort to many sensory assessments and some others of intermediate complex...
Article
Full-text available
Studying population structure has made an essential contribution to understanding evolutionary processes and demographic history in forest ecology research. This inference process basically involves the identification of common genetic variants among individuals, then grouping the similar individuals into subpopulations. In this study, a spectral-b...
Article
Harvesting blueberries at an optimal maturity stage, is an important determinant of quality, especially when fruit are intended for long term storage. However, because blueberries set and ripen asynchronously, several pickings are needed. In general, shorter harvest intervals (<4 d) are advised to maximize fruit firmness, but due to labor shortages...
Article
Full-text available
Fresh fruit from northern highbush blueberry ( Vaccinium corymbosum ) and rabbiteye blueberry ( Vaccinium ashei ) are highly perishable, so reaching distant markets while maintaining superior quality and value is a challenge. Although firmness is one of the most critical traits of blueberries ( Vaccinium sp.), most of the industry relies on a subje...
Article
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Plants produce a wide diversity of specialized metabolites, which fulfill a wide range of biological functions, helping plants to interact with biotic and abiotic factors. In this study, an integrated approach based on high-throughput plant phenotyping, genome-wide haplotypes, and pedigree information was performed to examine the extent of heritabl...
Article
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Calyx-end rot, caused by Botrytis cinerea, reduces the production and quality of apples. In this study, isolates of Botrytis obtained from blighted blossoms and fruits with calyx-end rot, were cultured and then morphologically and molecularly characterized. Twenty isolates were classified based on the morphology of their colonies on three culture m...
Article
Water deficit is the most limiting factor for wheat production, so wheat-breeding programmes are currently focused on developing high-performance genotypes under such conditions. Carbon isotope discrimination (∆¹³C) in grains is a trait closely related to yield and stress tolerance. However, conventional measurement of ∆¹³C is expensive, limiting i...
Article
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Natural variation of cyanogenic glycosides, soluble sugars, proline and nondestructive optical sensing of pigments (chlorophyll, flavonols and anthocyanins) were examined in ex situ natural populations of Eucalyptus cladocalyx F. Muell. grown under dry environmental conditions in the southern Atacama Desert, in Chile. After 18 consecutive dry seaso...
Article
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Wheat plants growing under Mediterranean rain-fed conditions are exposed to water deficit, particularly during the grain filling period, and this can lead to a strong reduction in grain yield (GY). This study examines the effects of water deficit after during the grain filling period on photosynthetic and water-use efficiencies at the leaf and whol...
Article
Lucerne (alfalfa, Medicago sativa L.) is grown extensively worldwide owing to its high forage biomass production and nutritional value. Although this crop is characterised as being tolerant to drought, its production and persistence are affected by water stress. Selection of genotypes of high yield potential and persistence after a long period of d...
Article
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Canopy temperature (Tc) by thermal imaging is a useful tool to study plant water status and estimate other crop traits. This work seeks to estimate grain yield (GY) and carbon discrimination (∆ 13 C) from stress degree day (SDD = Tc − air temperature, Ta), considering the effect of a number of environmental variables such as the averages of the max...
Article
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The world’s five Mediterranean-climate regions (MCRs) share unique climatic regimes of mild, wet winters and warm and dry summers. Agriculture in these regions is threatened by increases in the occurrence of drought and high temperature events associated with climate change (CC). In this review we analyze what would be the effects of CC on crops (i...
Article
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In Mediterranean climates soil water deficit occurs mainly during the spring and summer, having a great impact on cereal productivity. While previous studies have indicated that the grain yield (GY) of triticale is usually higher than bread wheat (Triticum aestivum L.), comparatively little is known about the performance of these crops under water-...
Data
Principal component analysis (PCA) of physiological and agronomic traits determined in triticale (Trit) and wheat (Wh) in different environments. Symbols represent the combination of species, water regime (WW, well-watered; WL, water-limited), site (CAU, Cauquenes; SR, Santa Rosa), and year (2015 and 2106). In (A) biplot of the first two principal...
Article
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This paper presents an innovative modified method of K-means clustering based on the set theory together with its application in the processing images of the agroindustry field. Traditional K-means permits the clustering of sets in subsets by means of defining their center according to the distance formula. When the data is concentrated in forms wi...
Article
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To overcome the environmental changes occurring now and predicted for the future, it is essential that fruit breeders develop cultivars with better physiological performance. During the last few decades, high-throughput plant phenotyping and phenomics have been developed primarily in cereal breeding programs. In this study, plant reflectance, at th...
Book
Full-text available
As a consequence of the global climate change, both the reduction on yield potential and the available surface area of cultivated species will compromise the production of food needed for a constant growing population. There is consensus about the significant gap between world food consumption projected for the coming decades and the expected crop...
Article
Full-text available
Fresh Chilean blueberries take in average 20-50 days to reach overseas markets, so a better knowledge of their postharvest behavior would help maintaining their quality for longer periods. Quality of highbush blueberries (Vaccinium corymbosum L. ‘Duke’ and ‘Brigitta’) was assessed at six stages based on color: 100% green (100G), 75% green + 25% pin...
Article
The role of fruit scar on water loss from fresh harvested, fully blue highbush blueberry (Vaccinium corymbosum L.) fruit was studied on three germplasm lines from each of three half-sib families at University of Talca, Chile. The stem scar of half of the harvested fruit was sealed using nail polish and weight loss of sealed and non-sealed fruit det...
Article
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Fresh blueberries are very susceptible to mechanical damage, which limits postharvest life and firmness. Softening and susceptibility of cultivars " Duke " and " Brigitta " to developing internal browning (IB) after mechanical impact and subsequent storage was evaluated during a 2-year study (2011/2012, 2012/2013). On each season fruit were careful...
Article
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Phenotyping, via remote and proximal sensing techniques, of the agronomic and physiological traits associated with yield potential and drought adaptation could contribute to improvements in breeding programs. In the present study, 384 genotypes of wheat (Triticum aestivum L.) were tested under fully irrigated (FI) and water stress (WS) conditions....
Article
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This article describes public, free software that provides efficient exploratory analysis of high-resolution spectral reflectance data. Spectral reflectance data can suffer from problems such as poor signal to noise ratios in various wavebands or invalid measurements due to changes in incoming solar radiation or operator fatigue leading to poor ori...
Article
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Aims: Long exposure to high temperatures or UV-radiation may induce negative effects on vine physiology and grape composition. Here, the effects of two methods to moderate radiation and temperature in the fruit zone of a Cabernet Sauvignon vineyard were evaluated against a control. Methods and results: The treatments assessed were: (a) periodical s...
Article
Full-text available
Plant breeding based on grain yield (GY) is an expensive and time-consuming method, so new indirect estimation techniques to evaluate the performance of crops represent an alternative method to improve grain yield. The present study evaluated the ability of canopy reflectance spectroscopy at the range from 350 to 2500 nm to predict GY in a large pa...
Article
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Preventing young blueberry (Vaccinium corymbosum L.) plants from fruiting can increase their vegetative growth. In previous studies, gibberellin (GA) applications reduced flowering in high bushblueberry, but the response was variable and cultivar dependent and was studied mostly using potted nursery plants. The purpose of this work was to determine...
Article
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Plant water status is an important factor to be quickly and accurately assessed temporally and spatially to maintain yield and quality standards in a changing environment. The pressure chamber is the most common method to measure midday stem water potential (MSWP), which is used as an accurate indicator of plants water status. However, the use of t...
Article
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Water stress periods are commonly used in olive orchards, specifically in regulated deficit irrigation (RDI) to improve oil quality. However, unplanned changes in the plant water status could alter a number of physiological processes, inducing reductions in yields, oil accumulation, vegetative growth and flower induction. In commercial orchards it...
Article
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Irrigation scheduling is critical for olive orchards, since it affects both fruit yield and olives composition. Regulated deficit irrigation (RDI) strategies have been applied with positive results in the past. However, to successfully regulate stress levels, it is necessary to have accurate measurements of plant water status, which is usually done...
Article
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The Austral papaya (Vasconcellea chilensis) is an endangered species that has valuable characteristics for introgression into other papaya species. These characteristics include disease resistance, cold tolerance and latex with low proteolytic activity. It is a species that grows under extreme environmental conditions of drought, salinity and tempe...
Conference Paper
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In edible fruit, pathways for the synthesis of esters and other important aroma compounds are still being elucidated. Recent evidence points to the formation of ester precursors de novo, rather than strictly via catabolic processes degrading previously formed molecules. To evaluate whether fatty acid biosynthesis via the ubiquitous 2-carbon elongat...
Chapter
The global demand for berry fruits has increased significantly in recent years across all the main crops, partly due to the perceived health benefits derived from their consumption and also because of changes in agronomic techniques that have widened the availability and distribution of these crops. As a result, berry fruits can be purchased virtua...
Article
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The Vineyard of the Future initiative is a multinational project that aims to establish a fully instrumented vineyard using wireless connectivity and automated data gathering and analysis. It also aims to be a test-bed for new technology and a trial site for investigating the potential effects of climate change on viticulture in Australia, Chile, U...
Article
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Applications of N-(2-chloro-4-pyridyl)-N'-phenylurea (CPPU) can increase blueberry (Vaccinium corymbosum L.) yield and fruit size, but their impact on postharvest is unknown. We studied repeated CPPU applications effects on yield and quality (harvest, postharvest), over 2 yr on mature 'Duke' plants in South-Central Chile. The first year, 5 or 10 mL...
Article
Chlorophyll and anthocyanin content provide a valuable indicator of the status of a plant's physiologybut to be more widely utilized it needs to be assessed easily and non-destructively. This is particularly evident in terms of assessing and exploiting germplasm for plant breeding programmes. We report,for the first time,experiments with Fragaria c...
Article
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Chile has become a major actor in the blueberry industry as the most important supplier of off-season fresh fruit for the northern hemisphere. Blueberry exports passed from US$ 30 million (around 4,000 tons) in 2000 to US$ 380 million (94,000 tons) in 2011. The characteristics of the major blueberry growing regions (North, Central, South-central an...
Article
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The application of CPPU increases fruit size and weight in blueberries, but the impact of CPPU on postharvest life of blueberry fruits has not been studied. A greater fruit size could reduce wax deposits on the fruit and diminish postharvest life. In this research the effect of CPPU on the quality and postharvest life of highbush blueberry fruit wa...
Article
Full-text available
The use of modified atmosphere in the packaging of fresh blueberries (Vaccinium corymbosum L. 'Brigitta') was studied as a function of harvest time and moment of bag sealing. In trial 1, four treatments were established considering harvest time (morning: am or afternoon: pm), and moment of bag sealing: before or after cooling at 0°C. In trial 2, th...
Article
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This research was carried out during the 2010/11 growing season to establish the effect of different types and times of harvest on the quality of fresh blueberries. The 6 treatments consisted of 3 harvest types (hand, automotive or shaker) and two harvest times (morning: 9-11 am; afternoon: 3-5 pm). Ten-year-old 'Brigitta' and 'O'Neal' plants, from...
Article
Full-text available
Chile, the major exporter of blueberries in South America, grows two species commercially, the highbush blueberry (Vaccinium corymbosum L.) and the rabbiteye blueberry (Vaccinium ashei Reade). Considering the increasing demands for this fruit, it is necessary to have reliable methods for genotyping and genetic traceability of the commercially grown...
Conference Paper
Full-text available
Blueberry (Vaccinium corymbossum L. cv. Brigitta) fruit were harvested at commercial maturity (> 80% blue) from two different farms in the Maule region of Chile on January 9 and 10, 2013, and packaged the over the next two days using several different packaging strategies that included perforated and non-perforated films and fumigation with SO2. Fr...
Article
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The cultivated strawberry of South America, the octoploid Fragaria chiloensis L. has a long and interesting history. While the origin of the species in Chile cannot be completely determined, it is suspected to be an introduction from North America by birds. After making landfall in Chile, the species spread from the coast into the mountains develop...
Article
This study analyzed the light quality and quantity under colored shading nets, together with their effects on physiological and morphological traits for Vaccinium corymbosum L. cv. Elliott. Different spectral ranges and shade intensities (25%, 50% and 75%) were produced using colored netting (black, red and white) along with a control (full sun). T...
Article
Full-text available
Research was carried out to study the mode of action of diphenylamine (DPA) and 1-methylcyclopropene (1-MCP), on control of superficial scald of Granny Smith apples (Malus domestica Borkh.), and its relation with chemical compounds. Fruit was harvested from a commercial orchard in Chile, 182 and 189 days after full bloom and received the following...
Article
Full-text available
Research was carried out to study the mode of action of diphenylamine (DPA) and 1-methylcyclopropene (1-MCP), on control of superficial scald of Granny Smith apples (Malus domestica Borkh.), and its relation with chemical compounds. Fruit was harvested from a commercial orchard in Chile, 182 and 189 days after full bloom and received the following...
Article
Full-text available
A study was carried out to determine the effects of two cooling systems and the application of 1-methylcyclopropene (1-MCP, SmartFreshTM) on the incidence of superficial scald in apples (Malus domestica Borkh.) cv. Granny Smith. Fruit were collected from a commercial orchard (Colbún, Maule Region, Chile) during 2004-2005 season. A completely random...
Article
Full-text available
Blueberries are an understory species. Light interception and distribution within the canopy impact on fruit quantity and quality. The aim of this experiment was to characterize light distribution in rabbiteye blueberries cv. Choice and determine its impact on flower bud formation. Fourteen-year-old plants growing in a commercial planting in Coihue...