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© 1992 Oxford University Press

RESEARCH-ARTICLE

Root Xylem Influence on the Water Relations and Drought Resistance of Rice

ELIZABETH B. YAMBAO, KEITH T. INGRAM1 and JOSELITO G. REAL

Agronomy, Plant Physiology, and Agroecology Division, International Rice Research Institute P.O. Box 933, 1099 Manila,Philippines

1To whom correspondence should be addressed

In order to determine the importance of root axial resistance to water flow for drought resistance of rice (Oryza sativa L.) aseries of glasshouse and growth chamber studies was conducted from 1985 to 1986. A preliminary study surveyed root distribution and histological characteristics of six cultivars grown in aerobic soil (20x20x90cm boxes) under well–watered ormoisture deficit conditions. Subsequently, four experiments were conducted with plants grown in culture solution. Our results demonstrate that plant breeders can use root thickness as a selection index for xylem size for root diameters up to about 1–2 mm.Using the Poiseuille–Hagen Law for water movement in capillaries, rice root axial resistance explained differences in leaf water potential and transpiration when only one cultivar was used, but did not explain differences among cultivars. Thus, increasing root xylem vessel radii probably will not directly increase drought resistance.

Key words: Rice (Oryza sativa), roots, xylem characteristics, drought resistance


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