Relationship between the initiation of tuber enlargement and changes in the content of endogenous jasmonic acid in water yam (Dioscorea alata L.)
2002
"Kikuno, H. (Kagoshima Univ. (Japan). Faculty of Agriculture) | Onjo, M. | Kusigemati, K. | Hayashi, M. "
"In a previous paper, we outlined how jasmonic acid (JA) and gibberellin-like substances participate in the initiation of tuber enlargement in water yams (Dioscorea alata L). In this study, we examined the relationship between the initiation of tuber enlargement and the changes in the content of endogenous JA in water yams subjected to short-day treatment and exposes to natural day length. Synthesis of JA was activated by short-day length. The time when the JA content became maximum varied in each strain and occurred earlier in the extremely early maturing strains than in the late maturing strains. In each strain, the peak of the JA content coincided with the initiation of tuber enlargement. However, the JA content decreased significantly after the initiation of tuber enlargement in each strain, even though vigorous growth and enlargement of the tuber continued thereafter. The results of this study indicate that JA may be related to the initiation of tuber enlargement in water yam. The JA content of the late maturing strains exceeded that of the extremely early maturing strains, suggesting that the sensitivity to JA varies with the earliness of each strain."
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