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Volume 2 Number 8 August 2020
IMPACT OF CLIMATIC AND EDAPHIC FACTORS ON GERMINATION, GROWTH, PHYSIOLOGICAL AND BIOCHEMICAL RESPONSE OF PIGEON PEA (Cajanus cajan L.)
Pages: 54-84Authors: N. Gandhi*, A. Sree Lekha, S. Priyanka, S. Manoj kumar, A. Archana, Y. Shivani, N. Saishma, P. Sai Raj, M. Rajkumar
Abstract
Growth responses of leguminous plants to minerals like Sodium (Na), Potassium (K), Calcium (Ca) and Fluorine (F) vary considerably among species. Pigeon pea (Cajanus cajan L.) is a sub-tropical crop, grown worldwide particularly in Asia (South Asia) for edible and fodder purposes, while little is known about its temperate and salinity tolerance. In order to investigate the effect of minerals like Sodium (Na), Potassium (K), Calcium (Ca), Magnesium (Mg) and Fluorine (F) on Pigeon pea (Cajanus cajan L.) the laboratory experimental setup established and divided into four different groups i.e. Experiment-1, Experiment-2, Experiment-3, Experiment-4 and Experiment-5. Plant growth was measured using growth analysis parameters [% germination, Relative Growth Rate (RGR), Net Assimilation Rate (NAR), Leaf Area Ratio (LAR), Leaf Weight Ratio (LWR), Specific Leaf Area (SLA), Specific Leaf Weight (SLW), Leaf Area Duration (LAD)], the physiological response to particular mineral stress calculated by measuring % Phytotoxicity, % Inhibition, Tolerance indices, Seed Vigor Index. The biochemical response to particular mineral stress calculated by measuring total carbohydrates, total protein, chlorophyll pigment concentrations and peroxidase enzyme activity. The investigation setup, Experiment-1 done with various concentrations of sodium salts (0.2 to 1.8 gm/2kg soil) to investigate the physiological and biochemical growth response of Pigeon pea (Cajanus cajan L.). The results obtained from the experiment conclude the germination is increased with increase in sodium concentration. Experiments-2 & 3 done with various concentrations of potassium and calcium salts (0.2 to 1.8 gm/2kg soil) to investigate the physiological and biochemical response of pegion pea. The results obtained from experiments conclude the germination rate decreased with increase in potassium concentration and germination rate increased with increase in calcium concentrations. Experiments-4 & 5 done with various concentrations of magnesium and fluoride salts (0.2 to 1.8 gm/2kg soil) to investigate the physiological and biochemical response of pegion pea. The results obtained from the experiments conclude the germination rate high at lower concentrations and at higher concentrations germination rate decreased compare to control treatment in both the cases.
