2013 年 57 巻 1 号 p. 23-30
The growth of vine cuttings in water yam was influenced by the time when the cuttings were collected. Since it was considered that endogenous plant hormones affect the growth, we analyzed the fluctuations of the concentrations of endogenous plant hormones in the mother plants and compared them with the growth of vine cuttings. Endogenous plant hormones, GA1, GA4, IAA, ABA, JA, JA-Ile, SA, tZ, DHZ and iP were identified and quantified in water yam leaves and/or leaf axils to observe the fluctuations of their concentrations in the leaves and leaf axils during the plant growth. Moreover, the rate of mini-tuber formation and root development of vine cuttings exhibited a high correlation with the level of GA4 and IAA, respectively. Therefore, it was revealed that the changes in the growth of vine cuttings was affected by the fluctuations of the concentrations of endogenous plant hormones. To our knowledge, this is the first report in which a comparison between the concentrations of endogenous plant hormones and the growth of vine cuttings in water yam was carried out.
