Associated physiological mechanisms during reproductive stage in lines of Swarna rice (Oryza sativa) pyramided with major drought yield quantitative trait loci qDTY1.1 and qDTY3.1

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dc.creatorHizon, Rona Joy Motas
dc.creatorTorres, Rolando O.
dc.creatorRamaiah, Venuprasad
dc.creatorSwamy, Mallikarjuna B. P.
dc.creatorDixit, Shalabh
dc.creatorSta.Cruz, Pompe C.
dc.creatorAllusion, Antonio G.
dc.creatorHernandez, Jose E.
dc.creatorHenry, Amelia
dc.date2026-02-09
dc.date2026-04-01T01:17:46Z
dc.date.accessioned2026-06-27T04:09:48Z
dc.descriptionDrought is a major abiotic stress that limits rice (Oryza sativa) production. Millions of hectares of rainfed lowland and upland rice in Asia are affected by drought stress yearly, which results in considerable yield reduction. Evaluation of the physiological characteristics that aid rice plants in maintaining yield under drought stress conditions may contribute to the development of potential drought-tolerant varieties. This study assessed the physiological characteristics of drought-tolerant lines with different combinations of qDTY3.1 and qDTY1.1 in the genetic background of Swarna, a popular, high-yielding but drought susceptible rice variety. Specifically, these lines were ‘qDTY3.1 lines’ (introgressed with qDTY3.1 alone), ‘qDTY1.1 lines’ (introgressed with qDTY1.1 alone), and ‘pyramided lines’ (introgressed with both qDTY3.1 and qDTY1.1). qDTY3.1 lines exhibited faster peduncle elongation rate, lower peduncle elongation breakpoint values, and longer final peduncle length under drought stress. qDTY1.1 lines presented more negative leaf osmotic potential and cooler canopy temperatures than Swarna that indicated better leaf hydration under drought. Pyramided lines produced higher panicle numbers, longer mean peduncle length, and higher grain yield under drought. These characteristics associated with qDTY3.1 and qDTY1.1 indicated that the plants performed better under drought stress than would be expected from the sum of the individual qDTY effects.
dc.identifierhttps://hdl.handle.net/10568/182326
dc.identifier.urihttp://hdl.handle.net/123456789/23596
dc.languageen
dc.publisherFunctional Plant Biology
dc.rightsLimited Access
dc.sourceHizon, Rona Joy, Rolando Torres, Venuprasad Ramaiah, Mallikarjuna Swamy, Shalabh Dixit, Pompe Sta Cruz, Teresita Borromeo, Antonio Lalusin, Jose Hernandez, and Amelia Henry. "Associated physiological mechanisms during reproductive stage in Swarna rice lines pyramided with major drought yield quantitative trait loci qDTY1. 1 and qDTY3. 1." Functional Plant Biology (2026): FP25062.
dc.subjectoryza sativa
dc.subjectdrought tolerance
dc.subjectrainfed farming
dc.subjectwater stress
dc.subjectquantitative trait loci
dc.subjectplant physiological processes
dc.subjectplant breeding
dc.subjectgenetic improvement
dc.titleAssociated physiological mechanisms during reproductive stage in lines of Swarna rice (Oryza sativa) pyramided with major drought yield quantitative trait loci qDTY1.1 and qDTY3.1
dc.typeJournal Article

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Instituto Internacional de Investigación del Arroz (IRRI)