Alejandro Presotto

Alejandro Presotto
Universidad Nacional del Sur | UNS · Centro de Recursos Renovables Zona Semiárida (CERZOS)

Dr.

About

60
Publications
6,798
Reads
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366
Citations
Additional affiliations
February 2020 - present
Universidad Nacional del Sur
Position
  • Professor (Associate)
August 2013 - present
Universidad Nacional del Sur
Position
  • Researcher

Publications

Publications (60)
Article
Full-text available
Bird attack is a serious limitation to sunflower yield in several regions of the world, but it could also cause selection. The wild Helianthus annuus, naturalized in several regions of the world, hybridizes with the crop and produces crop–wild offspring. It is unknown how the selective force of seed predation by birds could drive evolution after a...
Article
Agricultural weeds are plants well-adapted to agricultural environments interfering directly and indirectly with crop production and causing important economic losses worldwide. Crop-wild hybridization is one of the main forces that have ruled weed evolution along with adaptation to agricultural (or benign) environments. Considering the competing d...
Article
Full-text available
Brassica rapa L. is an annual Brassicaceae species cultivated for oil and food production, whose wild form is a weed of crops worldwide. In temperate regions of South America and especially in the Argentine Pampas region, this species is widely distributed. During 2014, wild B. rapa populations that escaped control with glyphosate applications by f...
Article
Full-text available
Hybridization is a common phenomenon in plants and can lead to the introgression of alleles from one population into another, generate new hybrid lineages, or cause species extinction. The environmental conditions and the genetic background of the participating populations may influence these outcomes since they can affect the fitness of hybrids, t...
Article
Aims The ability to form persistent seed banks is one of the best predictors of species´ potential to establish in new ranges. Wild sunflower is native to North America where the formation of persistent seed banks is promoted by disturbance and it plays a key role on the establishment and persistence of native populations. However, the role of the...
Article
Hybridization between crops and their wild relatives may promote the evolution of de-domesticated (feral) weeds. Wild sunflower (Helianthus annuus L.) is typically found in ruderal environments, but crop-wild hybridization may facilitate the evolution of weedy populations. Using one crop-specific mitochondrial marker (CMS-PET1) and 14 nuclear SSR m...
Technical Report
Full-text available
RESUMEN: La firma Argentierra S.A. es una empresa bonaerense de origen familiar, que destina una superficie de aproximadamente 13000 ha a la actividad agrícola-ganadera. Alrededor de la mitad de la superficie se reserva para cultivos de cosecha fina, mientras que el resto se reparte entre cultivos forrajeros, girasol y soja. En paralelo con la acti...
Article
Raphanus sativus (feral radish), a cosmopolitan weed, has developed resistance to acetohydroxyacid synthase inhibiting herbicides in several countries of South America. This study reports the effects of season-long interference of feral radish on grain yield and yield components of oilseed rape, wheat, and sunflower as well as on feral radish growt...
Article
Full-text available
El nabón (Raphanus sativus L.) es una maleza problemática ampliamente difundida en las regiones templadas de América que ha desarrollado resistencia a los herbicidas inhibidores de la enzima acetohidroxiácido sintasa (AHAS) debido a la mutación Trp574Leu. Las mutaciones que aportan resistencia a herbicidas inhibidores de AHAS pueden estar asociadas...
Preprint
Full-text available
Hybridization between crops and their wild relatives may promote the evolution of de-domesticated (feral) weeds. Wild sunflower is typically found in ruderal environments, but crop-wild hybridization may facilitate the evolution of weedy biotypes. Using one crop-specific mitochondrial marker (CMS-PET1) and 14 nuclear SSR markers, we studied the ori...
Article
Gene mutations endowing herbicide resistance may have negative pleiotropic effects on plant fitness. Quantifying these effects is critical for predicting the evolution of herbicide resistance and developing management strategies for herbicide‐resistant weeds. This study reports the effects of the acetohydroxyacid synthase (AHAS) Trp574Leu mutation...
Article
Full-text available
Herbicide-resistant oilseed rape (Brassica napus) cultivation in our country entails the risk of gene transfer to related wild species. One of these species is the wild turnip (B. rapa), an important weed of winter crops widely distributed in the Pampas region. Despite hybridization risks, Clearfield ® oilseed rape is available in Argentina. In 200...
Article
• When cultivated and wild plants hybridize, hybrids often show intermediate phenotypic traits relative to their parents, which make them unfit in natural environments. However, maternal genetic effects may affect the outcome of hybridization by controlling the expression of the earliest life history traits. • Here, using wild, cultivated, and reci...
Preprint
Full-text available
Raphanus sativus (feral radish), a cosmopolitan weed, has developed resistance to acetohydroxyacid synthase (AHAS) inhibiting herbicides in several countries of South America. This study reports the effects of season-long interference of feral radish on grain yield and yield components of oilseed rape, wheat, and sunflower as well as on feral radis...
Preprint
Full-text available
Gene mutations endowing herbicide resistance may have negative pleiotropic effects on plant fitness. Quantifying these effects is critical for predicting the evolution of herbicide resistance and developing management strategies for herbicide resistant weeds. This study reports the effects of the acetohydroxyacid synthase (AHAS) Trp574Leu mutation...
Preprint
Full-text available
When cultivated and wild plants hybridize, hybrids often show intermediate phenotypic traits relative to their parents, which make them unfit in natural environments. However, maternal genetic effects may affect the outcome of hybridization by controlling the expression of the earliest life history traits. Here, using wild, cultivated, and reciproc...
Article
The increased incidence of extreme temperature events due to global climate change poses a major challenge for crop production. Ability to increase temperature tolerance through genetic improvement requires understanding of how crops and their wild relatives respond to extreme temperatures. We developed a high-throughput technique to evaluate toler...
Article
Full-text available
Hairy vetch (Vicia villosa ssp. villosa Roth) is native of Europe and Western Asia and it is the second most cultivated vetch worldwide. Hairy vetch is used as forage species in semiarid environments and as a legume cover crop in sub-humid and humid regions. Being an incompletely domesticated species, hairy vetch can form spontaneous populations in...
Poster
Full-text available
Raphanus sativus (nabón), una maleza invasora de los sistemas agrícolas de Sudamérica, ha desarrollado resistencia a herbicidas inhibidores de la enzima acetohidrociácido sintasa (AHAS) debido a la mutación Trp-574-Leu. El objetivo de este trabajo fue determinar si la presencia de esta mutación implica un costo biológico. Se utilizaron dos accesion...
Conference Paper
Full-text available
Aumentos en la variabilidad climática aumentan la ocurrencia de temperaturas extremas, afectando el establecimiento y rendimiento de los cultivos. Los parientes silvestres de los cultivos están adaptados a una amplia variedad de ambientes, por lo tanto representan una excelente fuente de tolerancia a temperaturas extremas (TTE), sin embargo la dive...
Article
The timing of seed germination may determine the success of a weed species in an agroecosystem, and its expression is modulated by environmental conditions, but also by seed physiology and anatomy. The aims of this study were to investigate the roles of light, peri-carp, dry storage and cold stratification on seed dor-mancy and germination in feral...
Article
Full-text available
Invasive plants represent a valuable model system for studying contemporary evolution and predicting evolutionary responses to global climate change. Rapid adaptation to climate during range expansion has been recently recognised as a major factor in biological invasions. In this study, by using complementary approaches (common garden studies and t...
Article
Studying the levels and patterns of genetic diversity of invasive populations is important to understand the evolutionary and ecological factors promoting invasions and for better designing preventive and control strategies. Wild sunflower (Helianthus annuus L.) is native to North America and was introduced, and has become invasive, in several coun...
Data
Twenty-three variables registered on 374 plants from 15 populations
Article
Full-text available
Heat stress (HS) is a major threat to current and future crop production. Crop improvement for HS tolerance is a major tool for dealing with HS and crop wild relatives (CWR) offer the greatest variability for such improvement. Here, we evaluated the HS tolerance on four reproductive traits in cultivated and wild sunflower and tested for local adapt...
Article
BACKGROUND: Feral radish (Raphanus sativus L.) is a problematic weed that has become resistant to AHAS (acetohydroxyacid synthase) inhibitor herbicides due to the Trp-574-Leu mutation. AHAS gene mutation that causes herbicide resistance may present negative pleiotropic effects on plant fitness. This study reports the effects of the Trp-574-Leu muta...
Article
Hybridisation between crops and their wild relativesmay promote the evolution of weeds. Seed germination and dormancy are the earliest life-history traits and are highly influenced by the maternal parent. However, the ecological role of the maternal effect on seed traits in the evolution of crop–wild hybrids has received little attention. In this s...
Article
Full-text available
Wild turnip (Brassica rapa) is a common weed and a close relative to oilseed rape (Brassica napus). The Clearfield® production system is a highly adopted tool which provides an alternative solution for weed management, but its efficiency is threatened by gene transfer from crop to weed relatives. Crop-weed hybrids with herbicide resistance were fou...
Article
Full-text available
The presence of glyphosate-resistant oilseed rape populations in Argentina was detected and characterized. The resistant plants were found as weeds in RR soybeans and other fields. The immunological and molecular analysis showed that the accessions presented the GT73 transgenic event. The origin of this event was uncertain, as the cultivation of tr...
Poster
En el sudeste bonaerense se han detectado dificultades en el control de nabón con herbicidas inhibidores de la enzima acetohidroxiácido sintasa (AHAS).
Conference Paper
Full-text available
La introgresión de genes del cultivo en poblaciones silvestres emparentadas puede acelerar la adaptación de estas a nuevos ambientes, como los agro-ecosistemas. En Argentina, las poblaciones silvestres de girasol se comportan como ruderales y en algunos pocos casos, como malezas de los cultivos. El objetivo del trabajo fue evaluar el efecto de la i...
Article
Full-text available
BACKGROUND: Soon after the commercial release of sunflower cultivars resistant to imidazolinone herbicides (IMI), several uncontrolled feral radish (Raphanus sativus L.) populations were found in southeastern Buenos Aires, Argentina. These populations were studied in field, glasshouse and laboratory experiments aiming to characterize their resistan...
Conference Paper
Full-text available
SUMMARY Brassica rapa L. and B. napus L. are two Brassicaceae species cultivated worldwide. Oilseed rape (B. napus) is one of the most important sources of vegetable oil. Transgenic glyphosate-resistant cultivars are grown in Canada, USA, Australia, Japan and Chile. Wild B. rapa is an invasive species that occurs as a weed in several countries. In...
Article
Male sterile (MS) plants fail to produce functional anthers, pollen, or male gametes. This condition is useful in sunflower hybrid seed production. A MS form identified in an invasive population of H. annuus located in Las Malvinas was characterized by 37 morphological variables, six mitochondrial genes (atpA, atp6, coxIII, orfb, orfB and orfC) ass...
Article
Helianthus annuus is an invasive alien species naturalised in the central region of Argentina where it shares an extended area with the sunflower crop. As this species has also invaded several other sunflower crop growing areas in the world, it severely restricts the use of new technologies, for example herbicide tolerance by genetic modification....
Article
Full-text available
Radish has developed feral and weedy biotypes, which is a concern for agriculture around the world. In Argentina, it is one of the most widespread and troublesome crop weeds. In Brazil, this species has developed herbicide-resistance to acetohydroxyacid synthase (AHAS) inhibiting herbicides. The objective of this study was to record the presence of...
Article
Helianthus annuus subsp. annuus, a biotype of the same species of the domesticated sunflower H. annuus var. macrocarpus, is an emergent noxious weed in several regions of the world. The frequent hybridization that occurs between the two taxa could explain its diffusion in agricultural fields. The invasive dynamics of a weedy biotype was studied in...
Article
Wild sunflower, H. annuus ssp. annuus, is an invasive species widely distributed in several regions of the world, including central Argentina where it shares a large area with domesticated sunflower. The discovery of imidazolinone resistance in a wild sunflower population allowed the development of Clearfield® technology in cultivated sunflower. Th...
Article
Full-text available
As in several regions where sunflower production has moved to areas with limiting water availability, the search for water-stress tolerant genotypes has been intensified. Helianthus annuus ssp. annuus L. constitutes a potential genetic resource because it has naturalized in the semi-arid zone of central Argentina. The assessment of these genetic ma...
Conference Paper
Full-text available
The potential hybridization between oilseed rape Brassica napus (BN) and invasive Brassicaceae species like Raphanus sativus (RS) and B. rapa (BR) could facilitate the evolution of new weed biotypes. We studied the second generation (G2) of two BR and two RS biotypes collected in overlapping flowering with BN (cv. Nexera 8450) at four sites of Buen...
Article
Full-text available
Wild sunflower, Helianthus annuus, is an open-pollinated species that can be a major weed in several crops. If it hybridizes with cultivated sunflower the following generations can generate crop-wild hybrids that could evolve into invasive populations. The objective of this study was to morphologically characterize F1 hybrids between inbred lines a...
Article
Full-text available
The sunflower's wild relative Helianthus annuus L. is a non-native invader in several regions of the world. It was introduced as an experimental forage plant in central Argentina six decades ago where it probably escaped and developed extended populations coexisting with the sunflower crop. If the invasive taxon was diffused without modifications,...
Article
Full-text available
There is a high interest to understand and recreate the invasive process of successful non-native plant invaders. The genetic tools provide scanty information when the invasion is recent and there is gene flow among the invader and its crop relative. The concern about the government and private companies’ responsibilities in the diffusion process a...
Article
Full-text available
Wild Helianthus annuus naturalized in Argentina could be a valuable germplasm source for cultivated sunflower. Five wild populations collected in different environments and with different phenotype expression were evaluated as a genetic resource in a common garden study. The populations showed normal meiosis and produced a good seed set when their...
Article
Full-text available
Wild Helianthus annuus populations naturalized in central Argentina have spread since their Introduction from the center of origin in North America. Phenotypic characterization based on 45 morphological and phenological descriptors of nine populations from different geographic regions of Argentina and 17 populations from the USA provided by the US...
Article
Full-text available
Wild Helianthus annuus naturalized in Argentina constitutes a potential genetic resource for use in sunflower crop breeding. Seed morphology and oil content of nine stable Argentine wild populations were characterized and compared to 17 wild accessions from the US. The achenes were harvested from an experimental field at Bahia Blanca (S 38º41’, W 6...
Article
Full-text available
Since 2000 a research is in progress on wild sunflowers in Argentina, comprising naturalized H. annuus and H. petiolaris populations, and their relationship with cultivated sunflower. The study includes morphological, phe-nological, biochemical and molecular aspects, addressed to explain dispersal and adaptive processes and gene flow within sunflow...

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