Abstract
Gibberellin A1 (GA1), GA3 and GA4 inhibited the sprouting of nondormant bulbils of Chinese yam, Dioscorea opposita, where the effectiveness of the GAs was as follows: GA4>GA1+GA3. Uniconazole and prohexadione, plant growth retardants, promoted the sprouting of half-dormant bulbils. By contrast, these retardants inhibited the sprouting of nondormant bulbils. Gibberellin A3 (GA3) and A4 (GA4) which were applied to the stems of the sprouted bulbils, promoted stem elongation, but GAs applied to the bulbous parts inhibited this process. The effectiveness of the GAs on stem elongation was as follows: GA3+GA4 for the promotion and GA4 > GA3 for the inhibition. Uniconazole applied to the stem inhibited the stem elongation of the sprouted bulbils. These results suggest the possible involvement of endogenous GAs in the induction and maintenance of bulbil dormancy of D. opposita, as well as in the bulbil sprouting and subsequent stem elongation.
Published Version
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