Exogenous effect of gibberellins and jasmonate on tuber enlargement of Dioscorea opposita
¹Institute for Bioresources Research, Gyeongbuk Provincial Agricultural Technology Administration, Andong 760-891, Korea
²Division of Plant Biosciences, Kyungpook National University, Daegu 702-701, Korea; e-mail: firstname.lastname@example.org
³Korea Tobacco and Ginseng Central Research Institute, Daejon 305-805, Korea
The authors (S. K. Kim and J. T. Kim) have equally contributed to this study.
We have examined the single and combinational effect of gibberellins (GA3, GA4+7) and jasmonic acid (JA) on enlargement of Chinese yam tubers in field. In a single treatment, gibberellin promoted the tuber enlargement by one time application, whereas the lowest concentration (100ppm) led to the highest tuber yield rather than accumulative application. The effect of GA4+7 enhancing tuber yield was only recognised at the highest concentration by a single treatment. Tuber weight was decreased at the highest JA concentration, otherwise the lowest concentration of JA (5 ppm) significantly promoted the tuber weight by a single treatment (FS1). The combination of GA 50 ppm plus JA 5ppm enhanced remarkably the tuber weight by a single treatment (FS1). It is suggested that the combined treatment of yam plants with both gibberellic acid and jasmonic acid has promoted tuber yield.