Disentangling the roles of plant water status and stem carbohydrate remobilization on rice harvest index under drought
"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 stu...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Springer
2023
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| Online Access: | https://hdl.handle.net/10568/132703 |
| _version_ | 1855517446582042624 |
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| author | Dwivedi, Sharad K. Natividad, Mignon A. Kumar, Santosh Quintana, Marinell R. Chinnusamy, Viswanathan Henry, Amelia |
| author_browse | Chinnusamy, Viswanathan Dwivedi, Sharad K. Henry, Amelia Kumar, Santosh Natividad, Mignon A. Quintana, Marinell R. |
| author_facet | Dwivedi, Sharad K. Natividad, Mignon A. Kumar, Santosh Quintana, Marinell R. Chinnusamy, Viswanathan Henry, Amelia |
| author_sort | Dwivedi, Sharad K. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| 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." |
| format | Journal Article |
| id | CGSpace132703 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | Springer |
| publisherStr | Springer |
| record_format | dspace |
| spelling | CGSpace1327032025-12-08T09:54:28Z Disentangling the roles of plant water status and stem carbohydrate remobilization on rice harvest index under drought Dwivedi, Sharad K. Natividad, Mignon A. Kumar, Santosh Quintana, Marinell R. Chinnusamy, Viswanathan Henry, Amelia rice biomass starch harvest index principal component analysis drought maturity agronomic characters carbohydrate content plant water relations "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." 2023-12 2023-11-03T11:25:44Z 2023-11-03T11:25:44Z Journal Article https://hdl.handle.net/10568/132703 en Open Access application/pdf Springer Dwivedi, 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. |
| spellingShingle | rice biomass starch harvest index principal component analysis drought maturity agronomic characters carbohydrate content plant water relations Dwivedi, Sharad K. Natividad, Mignon A. Kumar, Santosh Quintana, Marinell R. Chinnusamy, Viswanathan Henry, Amelia Disentangling the roles of plant water status and stem carbohydrate remobilization on rice harvest index under drought |
| title | Disentangling the roles of plant water status and stem carbohydrate remobilization on rice harvest index under drought |
| title_full | Disentangling the roles of plant water status and stem carbohydrate remobilization on rice harvest index under drought |
| title_fullStr | Disentangling the roles of plant water status and stem carbohydrate remobilization on rice harvest index under drought |
| title_full_unstemmed | Disentangling the roles of plant water status and stem carbohydrate remobilization on rice harvest index under drought |
| title_short | Disentangling the roles of plant water status and stem carbohydrate remobilization on rice harvest index under drought |
| title_sort | disentangling the roles of plant water status and stem carbohydrate remobilization on rice harvest index under drought |
| topic | rice biomass starch harvest index principal component analysis drought maturity agronomic characters carbohydrate content plant water relations |
| url | https://hdl.handle.net/10568/132703 |
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