Water retention of excised rice leaves
1988
Bueno, F.F.D. | Ingram, K.T. (International Rice Research Inst., Los Banos, Laguna (Philippines). Dept. of Agronomy)
Water retention of excised leaves has been used to characterize drought resistance of wheat genotypes, but has never been tested in rice (Oryza sativa L.). This study was conducted to determine the water retention characteristics of excised leaves for six rice varieties and to assess the applicability of the method as a screening technique for drought-resistance in rice. Rices were grown in the greenhouse and subjected to five water treatments: Continuously saturated, no rice applied at 25-35, 35-45, 50-60, and 85-95 days after seeding. Excised leaves were weighed after 0, 1, 3, 5 and 7 h of drying and again after 24 h oven drying at 80 deg C. Water content was calculated from these weights. Weighing leaf samples after 1-3 hrs of drying provided the greatest varietal differentiation. Kinandang Patong, a drought resistant variety, almost always maintained higher leaf water content than IR20, a drought susceptible variety. Results suggest the possibility of using water retention capability to screen for drought tolerance under non-stressed conditions.
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