Osmotic stress and nitrogen metabolism of two groundnut (Arachis hypogaea L.) cultivars

Deep Saini, A. K. Srivastava

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Abstract

The water status and nitrogen metabolism of the groundnut (Arachis hypogaea L.) cultivars, M-13 and M-145 were examined during a period of water stress and recovery. 10 day old seedlings, grown in controlled environment were exposed to solutions of polyethylene glycol (MW 6000, osmotic potential, −0.5 or −0.8 MPa = −5 or −8 bars) for a week when the stress was relieved by replacing the PEG solution with a nutrient solution. Relative turgidity, total protein and free amino acid concentration and nitrate reductase activity were measured during the period of stress and recovery. Cultivar M-13, despite its lower relative turgidity during stress, was better able to preserve its protein concentration and nitrate reductase activity, and recover to a normal state within three days of the relief of stress. M-145, on the other hand, failed to recover within this period. The results are discussed in the light of the known performance of the two cultivars in the field under drought conditions
Original languageEnglish
Pages (from-to)185-192
Number of pages8
JournalIrrigation Science
Volume2
Issue number3
DOIs
Publication statusPublished - Sep 1981
Externally publishedYes

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