Relationship of grain length, width and weight to seedling vigor in rice (Oryza sativa L.)
1992
Teng, S. | Vergara, B.S. | Alejar, A.A. (International Rice Research Inst., Los Banos, Laguna (Philippines))
Seedling vigor is an important agronomic trait for crop establishment. The relationship of seed physical traits other than seed weight to seedling vigor in rice is well-known. An experiment was set up to study the above relationship. The seedling-growth of 38 rice varieties with different grain length, width, and weight was measured to determine the relative contribution of these grain physical characteristics to seedling vigor. Grain weight, whether heavy, medium, or light, was positively correlated with seedling leaf area and dry weight, but negatively correlated with germination percentage. This relationship was clearly demonstrated among cultivars (intervarietal) rather than within a single cultivar (intravarietal). The longer, wider, and heavier grains of a given rice cultivar produced taller seedlings that are characterized by larger leaf area and greater dry matter production. The study confirmed that grain weight is the best selection factor to use for producing vigorous seedlings whether within or between cultivars. Grain length and width, to a certain extent, can be used as selection criteria for seedling vigor in different rice varieties as measured by seedling leaf area and germination percentage, respectively
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