Abstract: vigna radiata l. (mungbean) is one of the most important pulse crops for protein supplement in a subtropical zone of the world, as it is the best alternative to meet the food needs of the large population of developing countries due to its nutritional superiority. The performance of two mungbean genotypes sml-668 and mh-318 to potassium fertilization 0.00, 1.54, 2.31and 3.08 mmol dm-3 in addition to the existing level of 1.32 mmol dm-3 in the soil medium was investigated under water stress conditions on nitrogen fixation and its attributes. Water stress (soil moisture contents 4.5 ± 0.5 %) was created by withholding irrigation at different growth stage. Water stress resulted in marked decrease in leghemoglobin and the activity of enzymes of nitrogen assimilation i.e. Nitrate reductase (nra) and nitrite reductase (nira) activity in both the genotypes. The nitrogen fixation were least affected when crop was stressed at the vegetative stage. Potassium treated plants maintained higher values for number of nodules, leghemoglobin content, nitrogenase, nitrate and nitrite reductase activity. The nitrogen fixation were least affected when crop was stressed at the vegetative stage. The reduction was relatively more in mh-318 genotype as compared to sml-668. This study provides direct evidence of the beneficial functions of potassium fertilization in mitigating the adverse effects of water stress on nitrogen fixation and its attributes.
Keywords: Leghemoglobin, Nitrogenase, Nitrate reductase, Potassium, Vigna radiata L., Water stress
Title: Interactive effect of different level of potassium on characters related to nitrogen fixation in Vigna radiata (L.)Wilczek under water stress
Author: Nisha Kataria, Narender Singh
International Journal of Life Sciences Research
ISSN 2348-3148 (online), ISSN 2348-313X (Print)
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