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Sri Karan Narendra Agriculture University, Jobner


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  • ArticleItemOpen Access
    Field efficacy of exogenously appliie putrescine in wheat ( triticum aestivum ) under water stress conditions: Indian Journal of Agriculture Sciences ;(2011) ;81(6); 516-9; Email nkgupta.pphy.rari@sknau.ac.in
    (Indian Journal of Agricultural Sciences, 2011) Gupta, Sunita; Gupta, N K
    A field experiment was conducted during winter ( rabi ) season of 2005–06 and 2006–07 taking wheat ( Triticum aestivum L. emend Fiori. & Paol.) genotype ‘HD 2329’ to investigate the efficacy of putrescine under water stress condition. Putrescine (0.01, 0.1 and 1.0 mM concentrations) was applied as seed treatment, one or two foliar sprays. For water stress treatment, the number of irrigations was reduced to three as compared to six in control. Putrescine application enhanced plant height, leaf area, grain number, grain weight, grain yield and biological yield under non-stress as well as under water stress conditions. Exogenous application of 0.1 mM putrescine was found the best in most of the observations. Among mode of applications, two foliar sprays of putrescine at the time of anthesis and post anthesis performed best over seed treatment and one foliar spray of putrescine
  • ArticleItemOpen Access
    Effect of post anthesis high temperature stress on growth, physiology and antioxidative defense mechanisms in contrasting wheat genotypes: Ind J Plant Physiol; ( 2015)
    (Indian Journal of Plant Physiology :An International Journal of Plant Physiology, 2015) Gupta, N K
    An experiment was conducted to study the effect of post anthesis high temperature stress on morphophysiological characters, antioxidants and yield of four wheat genotypes. Seeds were sown in the field under normal (15th November) and late sown (15th December) condition. High temperature stress caused significant reduction in photosynthetic parameters, relative water content, membrane stability and chlorophyll content in all the genotypes, with variable magnitude. Activities of superoxide dismutase, catalase, peroxidase and ascorbate peroxidase increase as a consequence of high temperature conditions. Higher enhancement in activities of antioxidant enzymes under late sown condition was observed in RAJ 4083. There were general reduction in yield and yield contributing parameters but the tolerant genotypes RAJ 4083 and RAJ 4037 maintained higher yield by maintaining relatively higher grain weight and grain number. The effect of high temperature was variable among four wheat genotypes but RAJ 4083 performed the best. It is suggested that heat tolerance of RAJ 4083 could be due to enhanced photosynthetic efficiency, chlorophyll retention, membrane stability and antioxidative defense mechanism under late sown condition. The study also underlines the protective role played by antioxidant enzymes under heat stress and their significance as the basis of the tolerance to high temperature