National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The present study was carried out in sixteen genotypes having different aptitude for tolerance to stress. Drought stress was imposed at early reproductive phase of growth. Despites of reduction in plant height and number of tillers, genotypes have shown least reduction in the grain yield under drought stress. Interestingly, genotypes like Sabour Sampann, Sabour Ardhjal and BRR-0028 showed higher adaptive responses with least reduction in plant height of less than 10% under drought than open field. Also, the number of tillers in BR-0028 and BRR-0063 were remained same in both the situation suggesting specificity of genotypic responses. Moreover, genotype BRR-0028, Sabour Sampann and Sabour Ardhjal showed higher yield retention with least reduction in the yield of only 25%, 30% and 31% respectively under drought stress. It implied the persuasion of accumulated CHO at unambiguous phase of growth period. CHO accumulated higher in leaf sheath (176.5 mg-1 g fresh wt) at 45 days of growth which gradually decreased (93.29 mg-1 g fresh wt) with increasing days in genotype Sabour Ardhjal at 75 days of growth. The same genotype revealed alter CHO accumulation in plant parts with highest in Culm (83.38 mg-1 g fresh wt), three fold higher than the leaf blade and leaf sheath during drought stress. The result also supported by the higher LAI/LAD during the early reproductive phase between 45 to 60 days of growth and suggested to explicit longer period for assimilates accumulation and sink development for better grain yield in rice under reproductive drought.
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