Vol. 15 No. 3
Comparative physiology of salinity, drought and heavy metal stress during seed germination in ricebean [Vigna umbellata(Thunb.) Ohwi and Ohashi]
Abiotic stresses, likely salinity, drought, heavy metals, temperatures (high or low), and other environmental extremes are the primary factors that causes of low crop yields and reduced plant growth in the biome. Such type of abiotic stress may cause metabolic impairment, nutrient imbalance, reduced synthesis of photosynthetic pigments which are closely related with biomass production in plant, thus, causing serious loss in crop productivity. The present experiment was undertaken to study the biochemical and physiological effects of salinity, drought and heavy metal (copper and lead) stress on seed germination in ricebean variety Bidhan 1. For studying the effect of iso-osmotic potential of salinity and drought stress solutions of NaCl and PEG 6000 with -0.2, -0.4 and -0.8 MPa osmotic potential were used whereas the solutions of 50, 100 and 200 μM Cu and Pb supplemented in the form of CuSO4. 5H2O and Pb(NO3)2 were used to study the effects of equimolar concentrations of copper and lead. Drought was found to produce more adverse effects on speed of germination, reserve mobilization by germinating seeds as well as radicle and plumule growth in the seeds of ricebean. The proline content in cotyledon increased under all the treatments of salinity, drought stress as well as metal stress. The highest intensity of salinity stress was found to produce more adverse effects than drought in respect of lipid peroxidation in germinating seeds of ricebean in the present experiment. The presence of lead in the germinating medium produced more detrimental effects than equimolar concentrations of copper.
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