CHANGES IN THE ACTIVITIES OF ANTIOXIDANT ENZYMES AND HILL REACTION DURING SEEDLING DEVELOPMENT OF CAJANUS CAJAN (L.) GENOTYPES

Author(s): B. Sujatha*, V. Durga Bhavani, B. Priyadarshini, M.V.V.P. Kumar and L.B. Divya Jyothi

Abstract: Pigeonpea (Cajanus cajan (L.) Millspaugh), the material selected for the present investigation is the second most important pulse crop in India. Twelve genotypes of pigeonpea which were divided into three groups based on the duration for flower initiation i.e. Short duration (ICPL151, ICPL87, ICPL1, ICPL6), Medium duration (T21, HY2 mutant, Pusa agheti, C11) and Long duration (ICPL270, ST1, PDM1, LRG30) were selected and was raised at the Experimental Farm of the Department of Botany, Andhra University, Waltair, Visakhapatnam, A.P., India for the current study on apparent photosynthesis, hill reaction activity, photophosphorylation, organic acids, ascorbic acid content and catalase activity in the 10th leaf. The apparent photosynthesis was observed greater in the ICPL87 of short duration, the T21 of medium duration and the PDM1 of long duration genotypes. The hill reaction activity of the 10th leaf of pigeonpea genotypes ICPL87, Pusa agheti and PDM1 of short, medium and long duration genotypes exhibited greater values in their respective groups. Variation in cyclic and non-cyclic photophosphorylation in ICPL87 and ST1 recorded the greatest and lowest values among all the genotypes studied. Among the genotypes, ICPL6 of short duration, the Pusa agheti of medium duration and the ICPL270 of long duration genotypes exhibited maximum values of free organic acid content in their respective groups. Among all the genotypes studied the PDM1 and T21 showed the maximum and the minimum values of ascorbic acid content and ICPL1 and ICPL6 of short duration genotypes showed a decrease in catalase activity respectively.

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