K. Osumi et al., FRUIT BEARING BEHAVIOR OF 4 LEGUMES CULTIVATED UNDER SHADED CONDITIONS, JARQ. Japan Agricultural Research Quarterly, 32(2), 1998, pp. 145-151
Fruit bearing behavior of 4 legume crops, soybean, mungbean, cowpea an
d lima bean, was observed under various light conditions. Response to
shading varied among the species. In the 4 legumes, the dry weight of
reproductive organs decreased with shading, but the declining pattern
and the reproductive allocation varied with the species. In all the sp
ecies, the dry weight of each sound bean remained almost constant irre
spective of light conditions. Throughout the development from flower t
o fruit, a larger number of flower buds and immature pods underwent ab
ortion under shade conditions than light conditions. Mungbeans and cow
peas, which bear long pods with many ovules, regulated the production
of the number of sound beans by reducing the seed set in a pod as well
as by reducing the fruit set. On the other hand, soybean and lima bea
n, which bear short pods with few ovules, responded mostly by reducing
the fruit set. The regulating pattern of sound bean production by the
suppressed legumes was directly related to the pod structure of the s
pecies.