Minimum applied ethylene concentration as it affects seedling growth in several legumes
1998
Zheng, S.H. (Kyushu Univ., Fukuoka (Japan). Faculty of Agriculture) | Inouye, J.
The minimum applied ethylene concentrations which have an influence on seedling growth were made clear in six epigeal leguminous species. The lowest ethylene concentration which inhibited hypocotyl elongation (LCe) significantly at 5% level ranged from 0.04 ppm (mung bean) to 0.16 ppm (soybean). On the other hand, the lowest concentration which increased hypocotyl thickness (LCt) significantly at 5% level ranged from 0.04 ppm (mung bean) to 0.38 ppm (soybean). The response of seedling growth to ethylene seemed to be classified into 3types: 1) LCt was lower than LCe in kidney bean and hyacinth bean, 2) LCt was similar to LCe in mung bean, black gram and cowpea, and 3) LCt was higher than LCe in soybean. Neither LCe nor LCt correlated with seed weight or hypocotyl thickness. However, each LCe and LCt correlated positively with the endogenous ethylene production of a seedling (r=0.841 and 0.869, n=9, P0.01). The results suggested that, in the seedlings, the high endogenous ethylene production may be discourage the response to applied ethylene
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