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dc.contributor.authorMier y Teran, Jorge C. Bernypt_BR
dc.contributor.authorKonzen, Enéas Ricardopt_BR
dc.contributor.authorPalkovic, Antoniapt_BR
dc.contributor.authorTsai, Siu Muipt_BR
dc.contributor.authorRao, Idupulapati M.pt_BR
dc.contributor.authorBeebe, Stephenpt_BR
dc.contributor.authorGepts, Paulpt_BR
dc.date.accessioned2020-01-29T04:08:46Zpt_BR
dc.date.issued2019pt_BR
dc.identifier.issn1471-2229pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/205053pt_BR
dc.description.abstractBackground: Common bean is the most important staple grain legume for direct human consumption and nutrition. It complements major sources of carbohydrates, including cereals, root crop, or plantain, as a source of dietary proteins. It is also a significant source of vitamins and minerals like iron and zinc. To fully play its nutritional role, however, its robustness against stresses needs to be strengthened. Foremost among these is drought, which commonly affects its productivity and seed quality. Previous studies have shown that photosynthate remobilization and partitioning is one of the main mechanisms of drought tolerance and overall productivity in common bean. Results: In this study, we sought to determine the inheritance of pod harvest index (PHI), a measure of the partitioning of pod biomass to seed biomass, relative to that of grain yield. We evaluated a recombinant inbred population of the cross of ICA Bunsi and SXB405, both from the Mesoamerican gene pool, to determine the effects of intermittent and terminal drought stresses on the genetic architecture of photosynthate allocation and remobilization in pods of common bean. The population was grown for two seasons, under well-watered conditions and terminal and intermittent drought stress in one year, and well-watered conditions and terminal drought stress in the second year. There was a significant effect of the water regime and year on all the traits, at both the phenotypic and QTL levels. We found nine QTLs for pod harvest index, including a major (17% of variation explained), stable QTL on linkage group Pv07. We also found eight QTLs for yield, three of which clustered with PHI QTLs, underscoring the importance of photosynthate remobilization in productivity. We also found evidence for substantial epistasis, explaining a considerable part of the variation for yield and PHI. Conclusion: Our results highlight the genetic relationship between PHI and yield and confirm the role of PHI in selection of both additive and epistatic effects controlling drought tolerance. These results are a key component to strengthen the robustness of common bean against drought stresses.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofBMC Plant biology. London. Vol. 19, no. 171 , (April 2019), p. 1-15.pt_BR
dc.rightsOpen Accessen
dc.subjectPhaseolus vulgarispt_BR
dc.subjectFeijãopt_BR
dc.subjectEstresse hídricopt_BR
dc.subjectArquitetura genéticapt_BR
dc.subjectSegurança alimentarpt_BR
dc.titleEffect of drought stress on the genetic architecture of photosynthate allocation and remobilization in pods of common bean (Phaseolus vulgaris L.) : a key species for food securitypt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001108597pt_BR
dc.type.originEstrangeiropt_BR


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