PJB-2019-905
Assessment of Rice (Oryza sativa L.) Genotypes for Water Stress Tolerance using Morpho-Physiological indices as a Screening Technique
Asma.
Abstract
Water stress negatively affects the plant growth and causes substantial decline in crop yield worldwide. Rice is an economically main cereal crop affected by water stress. In this study, twenty-one rice genotypes including 19 mutants (M5 generation) of super basmati and 2 varieties were subjected to different levels of PEG-600 (10% and 15%) at seedling stage to explore the mechanism of water stress tolerance. PEG-6000 induced water stress, caused a substantial decline in growth attributes and relative water contents (RWC), and increase the levels of electrolyte leakage (EL), hydrogen peroxide (H2O2) and malondialdehyde (MDA) contents in all rice genotypes. A significant difference among the tested rice genotypes was recorded on the basis morpho-physiological indices. Based on higher level of RWC along with higher shoot length, root length fresh and dry weights stress indices of rice seedlings, and less EL, MDA and H2O2 contents, 21 genotypes including eleven mutants are moderate tolerant, 3 mutants and two varieties were recognized as drought tolerant, while five mutants performed poorly were identified as drought sensitive/moderately drought sensitive. In brief, these tested morpho-physiological indices were suitable to screen rice germplasm for drought tolerance at seedling stage. Moreover, in screening experiments, HTT-138, Super bas, HTT-29 and HTT-51 can be used as drought tolerant check and HTT-39 as drought sensitive check at seedling stage. Keywords: Cluster analysis; Polyethylene glycol; Physiological indices; Rice; Water stress
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