Disentangling the roles of plant water status and stem carbohydrate remobilization on rice harvest index under drought

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dc.creatorDwivedi, Sharad K.
dc.creatorNatividad, Mignon A.
dc.creatorKumar, Santosh
dc.creatorQuintana, Marinell R.
dc.creatorChinnusamy, Viswanathan
dc.creatorHenry, Amelia
dc.date2023-12
dc.date2023-11-03T11:25:44Z
dc.date2023-11-03T11:25:44Z
dc.date.accessioned2026-06-27T04:08:30Z
dc.description"Harvest index is an important component of grain yield and is typically reduced by reproductive stage drought stress in rice. Multiple drought response mechanisms can affect harvest index including plant water status and the degree of stem carbohydrate mobilization during grain filling. In this study, we aimed to dissect the contributions of plant water status and stem carbohydrate mobilization to harvest index. Pairs of genotypes selected for contrasting harvest index but similar biomass and days to flowering were characterized at ICAR-RCER, Patna, India and at IRRI, Philippines. Multiple traits were related with harvest index across experiments, including mobilization efficiency at both sites as indicated by groupings in principal component analysis, and plant water status as indicated by direct correlations. Biomass-related traits were positively correlated with harvest index at IRRI but biomass was negatively correlated with harvest index at ICER-RCER, Patna. We observed that some pairs of genotypes showed differences in harvest index across environments, whereas other showed differences in harvest index only under drought. Of all time points measured when all genotypes were considered together, the stem carbohydrate levels at maturity were most consistently (negatively) correlated with harvest index under drought, but not under well-watered conditions. However, in the pairs of genotypes grouped as those whose differences in harvest index were stable across environments, improved plant water status resulted in a greater ability to both accumulate and remobilize stored carbohydrate, i.e. starch.</jats:p> Conclusion By distinguishing between genotypes whose harvest index was improved across conditions as opposed to specifically under drought, we can attribute the mechanisms behind the stable high-harvest index genotypes to be more related to stem carbohydrate remobilization than to plant water status. The stable high-harvest index lines in this study (Aus 257 and Wanni Dahanala) may confer mechanisms to improve harvest index that are independent of drought response and therefore may be useful for breeding improved rice varieties."
dc.formatapplication/pdf
dc.identifierhttps://hdl.handle.net/10568/132703
dc.identifier.urihttp://hdl.handle.net/123456789/22876
dc.languageen
dc.publisherSpringer
dc.rightsOpen Access
dc.sourceDwivedi, Sharad K., Santosh Kumar, Mignon A. Natividad, Marinell R. Quintana, Viswanathan Chinnusamy, and Amelia Henry. "Disentangling the Roles of Plant Water Status and Stem Carbohydrate Remobilization on Rice Harvest Index Under Drought." Rice 16, no. 1 (2023): 1-13.
dc.subjectrice
dc.subjectbiomass
dc.subjectstarch
dc.subjectharvest index
dc.subjectprincipal component analysis
dc.subjectdrought
dc.subjectmaturity
dc.subjectagronomic characters
dc.subjectcarbohydrate content
dc.subjectplant water relations
dc.titleDisentangling the roles of plant water status and stem carbohydrate remobilization on rice harvest index under drought
dc.typeJournal Article

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Instituto Internacional de Investigación del Arroz (IRRI)