Interactive effects of photoperiods and plant growth regulators on the development of flowering spikes and tubers in Chinese yams (Dioscorea opposita) cv. Ichoimo
Y. Yoshida et al., Interactive effects of photoperiods and plant growth regulators on the development of flowering spikes and tubers in Chinese yams (Dioscorea opposita) cv. Ichoimo, J JPN S HOR, 70(3), 2001, pp. 304-309
Citations number
15
Categorie Soggetti
Plant Sciences
Journal title
JOURNAL OF THE JAPANESE SOCIETY FOR HORTICULTURAL SCIENCE
The interaction between photoperiods and plant growth regulators [gibberell
in A(3) 100ppm (GA), uniconazole P 25ppm(Uni), n- propyl dihydro-jasmonate
50ppm (PDJ), and salicylic acid 1000ppm (SA)] on the development of the mai
n shoots, spikes, and aerial and new tubers in Chinese yam (Dioscorea oppos
ita Thunb. cv. Ichoimo) plants was observed. The untreated control plants y
ielded the longest main shoots followed by GA, SA, PDJ, and Uni. Plant, tre
ated with growth regulators, grew more under a 24-hr photoperiod than did t
hose under an 8-hr photoperiod. GA treated plants, grown under the 24-hr ph
otoperiod, developed spikes at a significantly lower node than that similar
ly treated plants grown under an 8-hr photoperiod; whereas the first flower
ing node on the control, GA, SA, Uni, and PDJ treated plants, grown under t
he 24-hr photoperiod, was equally higher than comparable plants, grown unde
r the 8-hr photoperiod. More spikes per plants were initiated under the 24-
hr photoperiod than on plants grown under an 8-hr photoperiod. GA treatment
severely decreased the number of spikes under the 8-hr photoperiod. Aerial
and new tubers developed earlier on plants under the short day than did th
ose under constant light, but the new tubers on the latter treatment weight
ed more than did those on the former. The formation of aerial tubers was se
verely inhibited by GA but promoted by Uni under both photoperiods, while t
he growth of now tubers was significantly promoted by GA. and significantly
inhibited by Uni. PDJ and SA had no effect on the growth of aerial and new
tubers.