Abstract
IMPACT OF WATER STRESS ON LIPID PEROXIDATION, ASCORBIC ACID AND ULTRASTRUCTURAL CHANGES IN MESOPHYLL CELLS OF PIGEONPEA (CAJANUS CAJAN (L.) MILLSPAUGH) SEEDLINGS

S. Punyasheela Devi* and B. Sujatha

ABSTRACT

Responses of lipid and ascorbic acid content to water stress induced by PEG6000 were studied in two pigeon pea [Cajanus cajan (L.) millspaugh] cultivars. Water stress condition was stimulated in three levels of osmotic stress of 0Mpa (control), -0.3Mpa,-1.1Mpa and -2.3Mpa. Polyethylene glycol-6000 is used for initiation of water stress in seedlings of pigeonpea. The study was performed in two pigeonpea varietie; ICPL-85063(Laxmi) a short duration and short cultivar and ICPL -87119 (Asha) medium duration and tall cultivar were studied. The aim of this study is to understand the levels of both the lipid peroxidation and ascorbic acid. The results depicted higher values in all the treatments when compared to controls in both the cultivars. The activities of lipid peroxidation and ascorbic acid levels were registered lower values in all the treatments when compared to their controls. The level of ascorbic acid content is high in cv ICPL-85063 than in cv ICPL-87119 in response to polyethylene glycol treatments. The cv ICPL-85063 is less sensitive to water stress and polyethylene treatments compared to cv. ICPL-87119. The results from the comparative analyses of the lipid peroxidation and ascorbic acid in short and tall varieties are discussed in terms of their possible involvement in conferring resistance to water stress.

Keywords: Cajanus cajan; drought; pigeonpea; lipid peroxidation; ascorbic acid.


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