Publication: Water deficit stress in the reproductive stage of four Indica rice (Oryza sativa L.) genotypes
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Issued Date
2010-10-01
Resource Type
ISSN
05563321
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2-s2.0-78649817962
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Mahidol University
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SCOPUS
Bibliographic Citation
Pakistan Journal of Botany. Vol.42, No.5 (2010), 3387-3398
Suggested Citation
Suriyan Cha-Um, Suravoot Yooyongwech, Kanyaratt Supaibulwatana Water deficit stress in the reproductive stage of four Indica rice (Oryza sativa L.) genotypes. Pakistan Journal of Botany. Vol.42, No.5 (2010), 3387-3398. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/28449
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Title
Water deficit stress in the reproductive stage of four Indica rice (Oryza sativa L.) genotypes
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Abstract
Relative water content (RWC) in the leaf of different rice cultivars dropped significantly in relation to reduced soil water content (SWC), especially in PT1 and IR20. In contrast, the proline content in the leaf-blade and leaf-sheath increased when plants were subjected to 7% SWC. The RWC was positively related to chlorophyll degradation. Chlorophyll a, chlorophyll b, total chlorophyll, total carotenoids, maximum quantum yield of PSII, stomatal conductance and water use efficiency in rice grown under water-deficit conditions declined significantly in comparison to the control group, leading to a reduction in net-photosynthetic rate. In addition, when exposed to water-deficit, panicle length and fertile grains in KDML105 and NSG19 were stabilized, leading to greater productivity than in PT1 and IR20. These data were utilized as effective criteria for the classification of water-deficit tolerance. From the results, KDML105 and NSG19 were identified as water deficit-tolerant, and PT1 and IR20 as water deficit-susceptible.