Evaluation of rhizobial isolates for physiological responses in mungbean (Vigna radiata L. wilczek) under rainfed conditions
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Date
2017
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CCSHAU
Abstract
The study entitled, “Evaluation of rhizobial isolates for physiological responses in mungbean
(Vigna radiata L. wilczek) under rainfed conditions” was conducted during kharif season of 2016 at
drought plots of Crop Physiology field area, Department of Agronomy, CCS Haryana Agricultural
University, Hisar. The experiment was laid out in factorial RBD consisting of two irrigation levels, i.e.,
rainfed (no post sowing irrigation) and two irrigations one each at pre-flowering and pod formation
stage and four rhizobial isolates i.e. Recommended dose of fertilizer (RDF), RDF + Rhizobium sp.
(Vigna) 703 + PSB strain P-36, RDF + MR 63, RDF + MR 54, RDF + MB 17a and RDF + MH 8b2
with three replications. Drought stress decreased the growth of mungbean in terms of plant height, dry
matter accumulation and nodule number. However, treatment with rhizobial isolates increased the
growth parameters under drought stress. All the plant water status parameters such as leaf water
potential, RWC and CTD decreased under drought stress. Application of rhizobial treatments improved
the plant water status under both environments. Gaseous exchange studies mainly rate of
photosynthesis; transpiration and stomatal conductance get reduced under drought stress. Rhizobial
treatments were more effective to brought consecutive improvement in gaseous exchange under
drought. Membrane injury and canopy temperature enhanced under drought stress but rhizobial
inoculation increased the membrane stability and decreased the canopy temperature. Biochemical
metabolite such as chlorophyll, MSI (%) and leghaemoglobin declined under drought stress. Rhizobial
treatments improved all the above biochemical metabolites. The nutrient composition i.e. nitrogen and
phosphorus decreased in seed and straw under drought stress. Seed and biological yield reduced
significantly due to decreased number of pods, number of branches and test weight under drought
stress. Rhizobial treatment improved the yield and its attributes by maintaining plants water status and
various physiological and biochemical processes. Rhizobial isolates MR 63 and MB 17a proved to be
relatively more effective over other rhizobial strains under drought in mungbean.
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