Growth and seed production in wild and weed azuki beans under shading conditions

Yasuda Kentaro, Yamaguchi Hirofumi

doi:10.3719/weed.51.61

In order to obtain fundamental knowledge of habitat management for the in-situ conservation of wild and weed azuki beans as genetic resources, we investigated their growth including plant architecture change, dry weight, and seed production under three shading conditions (50%, 70%, and 100% in relative light intensity). Under the strong shading condition, the leaf size, total stem length, number of branches on the main stem, main stem circumference, dry weight, and total number of seeds all decreased in the wild and weed azuki beans, however, the inter-node length of the main stem increased. The strong shading slightly decreased the main stem length in wild azuki, however, it lengthened the main stem length or futile in weed azuki. This phenotypic plasticity is assumed to enhance a plant's success in gaining access to the top of vegetation crown when it is shaded by other plants during the seedling stage. The wild azuki bean had a high ability compared to the weed azuki bean in the expansion of the main stem under the light-limiting condition, suggesting that the wild azuki bean is better adapted to competitive environments. The reduced seed productivity in both the wild and weed azuki beans under the shaded conditions implies that they require much more light intensity at least during the late growing stage.

Growth and seed production in wild and weed azuki beans under shading conditions

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