Publication: Water-deficit tolerant classification in mutant lines of indica rice
Issued Date
2012-03-01
Resource Type
ISSN
1678992X
01039016
01039016
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2-s2.0-84857863145
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Mahidol University
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SCOPUS
Bibliographic Citation
Scientia Agricola. Vol.69, No.2 (2012), 135-141
Suggested Citation
Suriyan Cha-um, Suravoot Yooyongwech, Kanyaratt Supaibulwatana Water-deficit tolerant classification in mutant lines of indica rice. Scientia Agricola. Vol.69, No.2 (2012), 135-141. doi:10.1590/S0103-90162012000200008 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/13489
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Title
Water-deficit tolerant classification in mutant lines of indica rice
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Abstract
Water shortage is a major abiotic stress for crop production worldwide, limiting the productivity of crop species, especially in dry-land agricultural areas. This investigation aimed to classify the water-deficit tolerance in mutant rice (Oryza sativa L. spp. indica) genotypes during the reproductive stage. Proline content in the flag leaf of mutant lines increased when plants were subjected to water deficit. Relative water content (RWC) in the flag leaf of different mutant lines dropped in relation to water deficit stress. A decrease RWC was positively related to chlorophyll a degradation. Chlorophyll a, chlorophyll b, total chlorophyll, total carotenoids, maximum quantum yield of PSII, stomatal conductance, transpiration rate and water use efficiency in mutant lines grown under water deficit conditions declined in comparison to the well-watered, leading to a reduction in net-photosynthetic rate. In addition, when exposed to water deficit, panicle traits, including panicle length and fertile grains were dropped. The biochemical and physiological data were subjected to classify the water deficit tolerance. NSG19 (positive control) and DD14 were identified as water deficit tolerant, and AA11, AA12, AA16, BB13, BB16, CC12, CC15, EE12, FF15, FF17, G11 and IR20 (negative control) as water deficit sensitive, using Ward's method.