Effect of Lead (Pb2+) on Different Morpho-Physiological and Yield Traits of Mungbean (Vigna Radiata L. Wilzeck) under Water Deficit Conditions
Effect of Lead (Pb2+) on Different Morpho-Physiological and Yield Traits of Mungbean (Vigna Radiata L. Wilzeck) under Water Deficit Conditions
Fiaz Ahmad1, Mumtaz Hussain2, Ghulam Abbas1, Muhammad Jawad Asghar1 and Muhammad Rizwan3*
ABSTRACT
Plant growth and development are adversely affected by different abiotic stress especially lead and water stress. Therefore, present study was conducted with the aim to investigate the response of two mungbean varieties to three different Pb2+ concentrations under two water stress conditions. Different morpho-physiological and yield traits were studied. Both varieties showed gradual reduction in morphological traits at increasing concentration of lead and water stress. Moreover, morphological traits were more severely affected by combined lead and water stress treatment (80 mg Pb2+ 50% FC) as compared to single lead (40 mg Pb2+ 100% FC and 80 mg Pb2+ 100% FC) and single water stress treatment (0 mg Pb2+ 50% FC). The negative effect of Pb2+ and water stress on growth of shoot, root length, shoot, and root fresh and dry weight was observed more during 2nd harvest interval as compared to the 1st harvest interval. Highly significant differences were observed among treatments for all physiological and yield traits except chlorophyll b. Shoot phosphorus contents, shoot sodium contents and number of pods/plant also showed significant differences among varieties. All physiological and yield parameters showed gradual reduction with increasing concentration of lead and water stress. Uptake of Na+, K and P was reduced significantly in all treatments but lead accumulation in shoot was increased in single lead treatment (80 mg Pb2+ 100% FC) as compared to combined lead and water stress treatment. Combined lead and water stress treatment (80 mg Pb2+ 50% FC) showed adverse effects on plant growth and development as compared to other stress treatments. Comparison between varieties showed that AZRI Mung 2006 performed better than NM 2006 under heavy metal (Pb2+) and water deficit conditions. Therefore, AZRI Mung 2006 proved to be a useful germplasm source against lead and water stress.
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