抄録
Existence of considerable amounts of gibberellins in crop residual was detected in rice and barley straw, bean pericarps after full ripening and abscind bean cotyledons. Gibberellin activity was detected even when the straw of rice and barley, and full ripened bean pericarps were air-dried for a long time before the extraction of gibberellins. The gibberellin activity in the rice straw was found only in the acidic ethylacetate fraction and no activity was detected in the acidic n-butanol fraction (Fig. 1). On the other hand, in the barley straw and the bean pericarps, the activity was detected in both fractions (Fig. 2). In the kidney bean, the full ripened and then air-dried pericarps contained almost the same amount of gibberellins in both fractions as the developing one (Fig. 3). The abscind bean cotyledons were also found to contain almost the same amount of gibberellin in both fractions as in the cotyledons at their early stage of germination (Fig. 4). It may be concluded from these results that gibberellins are widely detected in the crop residuals that already accompanying no growth. Moreover, gibberellins may play certain roles not only in their own growth of the organs that containing those gibberellins but also in other physiological phenomena such like as translocation of nutrients. It is also speculated that if these crop residuals are returned into the field, the gibberellins in the residuals would also be returned into the soil.
