Genotypic variation in rice root system distribution and activity in response to short-term soil drought

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dc.creatorKameoka, Emi
dc.creatorMitsuya, Shiro
dc.creatorSuralta, Roel R.
dc.creatorYamauchi, Akira
dc.creatorHenry, Amelia
dc.date2023
dc.date2023-11-04T02:43:42Z
dc.date2023-11-04T02:43:42Z
dc.date.accessioned2026-06-27T04:10:08Z
dc.descriptionIn this study, two experiments were conducted to evaluate the genotypic variation of rice root system distribution and root activity in response to short-term drought conditions. Seven rice genotypes were used, of which one (Rexmont) showed the greatest reduction in shoot biomass under drought, and two (Swarna and KDML105) showed the least reduction in shoot biomass under drought in both experiments. In a phytotron experiment (Experiment 1) in which root hydraulic conductivity (Lpr) of 21-day-old rice plants was evaluated in well-watered (control) and dry down (drought) conditions, the Lpr of Swarna, KDML105, and IRAT109 were significantly lower under drought compared to the control. In a field experiment (Experiment 2) conducted in the 2013 wet season at IRRI, stomatal conductance, bleeding rate, and root surface area density (RSAD) at 0-15, 15-30, 30-45, and 45-60 cm soil depths were measured in an irrigated (control) and rainfed (drought) treatments. Swarna, KDML105, and FR13A showed significant reductions in RSAD at 0-30 cm depth under drought in the field compared to the control, while Rexmont and IRAT109 showed no significant changes. In addition, Rexmont and Swarna both maintained higher bleeding rates than the other genotypes. Based on the root hydraulic and architectural traits of contrasting genotypes, we conclude that the bleeding rate did not explain the genotypic variations in the maintenance of shoot biomass, and that reducing shallow root growth and Lpr in response to drought conferred the best ability to maintain shoot biomass under short-term drought conditions.
dc.formatapplication/pdf
dc.identifierhttps://hdl.handle.net/10568/132717
dc.identifier.urihttp://hdl.handle.net/123456789/23781
dc.languageen
dc.publisherJ-STAGE
dc.rightsOpen Access
dc.sourceKameoka, Emi, Shiro Mitsuya, Roel R. Suralta, Akira Yamauchi, and Amelia Henry. "Genotypic variation in rice root system distribution and activity in response to short-term soil drought." Plant Root 17 (2023): 45-58.
dc.subjectdrought
dc.subjectwet season
dc.subjectexperiments
dc.subjectroot hydraulic conductivity
dc.subjectfield experiment
dc.subjectstomatal conductance
dc.subjectirrigated
dc.subjectrainfed
dc.subjectcontrol
dc.subjectmaintenance
dc.subjectroot systems
dc.subjectoryza sativa
dc.subjectgenotyping
dc.subjectdecompression chambers
dc.titleGenotypic variation in rice root system distribution and activity in response to short-term soil drought
dc.typeJournal Article

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Instituto Internacional de Investigación del Arroz (IRRI)