Claudio Ezequiel Pandolfo

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• Doctor
• Professor at Universidad Nacional del Sur

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...

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...

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...

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...

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...

Environmental conditions throughout the sunflower life cycle affect its phenological and physiological aspects, influencing growth and development, and ultimately, grain yield and oil content. While numerous studies have clarified the effects of specific environmental factors on sunflower oil yield and its components, a comprehensive understanding...

Environmental conditions throughout the sunflower life cycle affect its phenological and physiological aspects, influencing growth and development, and ultimately, grain yield and oil content. While numerous studies have clarified the effects of specific environmental factors on sunflower oil yield and its components, a comprehensive understanding...

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...

Understanding the emergence patterns of agricultural weeds is paramount for effective management practices. This study investigates the emergence dynamics of feral radish (Raphanus sativus L.), a widespread weed in the Americas, unravelling the intricate interplay of seed attributes-low or no dormancy, darkness requirement, and indehiscent siliques...

We reviewed and performed a quantitative synthesis on herbicide‐resistant weeds from rain‐fed crops in Argentina. Twenty‐four weed species distributed in the main extensive crops (soybean, maize, wheat, barley, oilseed rape, sunflower, chickpea and peanut) have evolved herbicide resistance. Of the total, 54% are grasses, 88% are annual species and...

The adoption of genetically modified (GM) and non-GM Brassica napus herbicide-resistant cultivars, along with the possibility of introgression with B. rapa, has led to the emergence of new weedy biotypes. In Argentina, in 2012, natural populations of transgenic (GM) glyphosate-resistant and non-GM AHAS-inhibiting resistant B. rapa were detected. Th...

Germination and emergence are critical life stages for annual plants and so their understanding is key for managing weed populations. Here, we conducted experiments to investigate the effect of temperature, light, pericarp and dry storage on dormancy and germination, and the effect of depth and irrigation on seedling emergence in the weed Raphanus...

Societal Impact Statement: Given the rapidly increasing drought and temperature stresses associated with climate change, innovative approaches for food security are imperative. One understudied opportunity is using feral crops—plants that have escaped and persisted without cultivation—as a source of genetic diversity, which could build resilience...

Brassica rapa is an annual species cultivated for centuries for food consumption and oil. Its wild form is a common weed in temperate climates around the world, including Argentina, interfering in more than 20 crops. The adoption of genetically modified (GM) and non-GM Brassica napus herbicide-resistant cultivars and the possibility of introgressio...

Agricultural weeds descended from domesticated ancestors, directly from crops (endoferality) and/or from crop–wild hybridization (exoferality), may have evolutionary advantages by rapidly acquiring traits pre‐adapted to agricultural habitats. Understanding the role of crops on the origin and evolution of agricultural weeds is essential to develop m...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

En el sudeste bonaerense se han detectado dificultades en el control de nabón con herbicidas inhibidores de la enzima acetohidroxiácido sintasa (AHAS).

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...

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...

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...

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...