Thumbnail Image

Acharya Narendra Deva University of Agriculture & Technology, Ayodhya

Browse

2014 - 20162
Reset filters
Author: Singh, Alok Kumar × End date: 2019 × Start date: 2010 × Type: Article ×
Reset filters

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    ArticleItemOpen Access
    Biochemical Assimilates Accumulation and Remobilization at Reproduction Stage Drought Stress in Upland Rice (Oryza sativa L.)
    (Environment & Ecology, 2016) Singh, Alok Kumar
    A very week correlation obtained between leaf rolling score and yield, shoot soluble sugar and RWC, respectively. Leaf depth ; score in well correlated with leaf soluble sugar. Plant height is often considered as a factor in plant response to drought stress. Rice accumulates significant amount of carbohydrate before and wide variability exists among genotypes. Improved variety like NDR-97, Vandana and DH line have higher content of total soluble sugar at flowering than do low yielding traditional cultivar like Azucena and Saita correlation study revealed strong positive relationship between grain yield in stress and shoot soluble sugar. Assimilate accumulated prior to flowering are of paramount importance when plant experience drought at later stage. We hypothesized that grain yields of rice crops drought stressed at flowering, directly related to reserve food materials and the ability of the plant to translocate those assimilate.
  • Thumbnail Image
    ArticleItemOpen Access
    Analysis of Correlation and Path Coefficients among Yield and Biochemical Traits under Irrigated and Reproductive Stage Drought Stress in Oryza sativa L.
    (VEGETOS, 2014) Singh, Alok Kumar
    Inter-relationships among yield and fourteen biochemical traits were studied under NS and RSS in eighteen genotypes of upland rice. None of the biochemical traits showed significant phenotypic correlation with grain yield plant-1 under irrigated (NS), while grain yield plant-1 had highly significant and positive correlation with chlorophyll a, chlorophyll b, nitrate reductase, soluble sugar at flowering starch at re-watering and soluble sugar in leaf under reproductive stage drought stress (RSS). This indicated that these biochemical traits were important associates of grain yield under RSS. Out of 124 character pairs, the significant estimates of phenotypic correlations in either direction were shown by nine character pairs in NS and 21 character pairs under RSS. In path analysis, high order positive direct effects was exerted by soluble sugar upper root and starch at re-watering under NS and starch at maturity, followed by leaf starch and chlorophyll a under RSS. Nitrate reductase, soluble sugar at flowering and starch in leaf emerged as most important indirect yield contributors due to their high order positive indirect effects on grain yield under NS.