Morphophysiological responses to water stress of ten varieties of peanut (Arachis hypogaea L.)
1988
Del Rosario, D.A. | Fajardo, F.F. (Philippines Univ., Los Banos, College, Laguna (Philippines). Inst. of Plant Breeding)
Four high yielding peanut varieties, five intermediates and one low yielder previously selected from field screening for drought resistance were planted in the greenhouse and subjected to impose water stress and non-stress conditions during vegetative to reproductive stages. Comparisons were made in terms of plant height, dry matter yield, leaf area, stomatal resistance, transpiration rate, leaf temperature, leaf water potential and water use efficiency. At soil moisture content of 21% (approximately 50% of soil field capacity), significant interaction effect of variety and water regime on stomatal resistance, leaf water potential and root weight was observed. Under non-stress conditions, no significant differences were observed in all parameters except for root weight. However, considering the mean effect of the varieties, significant differences were observed in all parameters except for leaf temperature. Three entries were considered potential drought resistant varieties based on their absolute performance under stress. Acc 847, 55-437 and GNP 1157 performed better than the other entries in terms of morphophysiological characters and seed yield. High yield appeared to be correlated to high leaf area, high leaf water potential, high shoot weight and plant height. Water use efficiency (WUE) was observed to decrease in all entries under stress with a marked decrease exhibited by the low yielders, EG Bunch and TMV2.
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