Effects of rhizome soaking with gibberellin solution prior to planting on growth and development of Curcuma alismatifolia Gagnep
2009
Khuankaew, T., Niigata Univ. (Japan) | Ohyama, T. | Ruamrungsri, S.
Rhizomes of Curcuma alismatifolia Gagnep. were soaked with 100 mg/L GA3 for 0, 3, 6, 12, 24 and 48 hours prior to planting on 17 March 2005 at Chiang Mai University, Thailand. The results showed that the rhizome soaking with GA3 solution delayed the emergence of shoot. The GA3-untreated control plants sprouted at 43 days after planting (6 weeks after planting (WAP)) while rhizomes soaked with GA3 for 3, 6, 12, 24 and 48 hours prior to planting sprouted at 55 (8 WAP), 57 (8 WAP), 50 (7 WAP), 63 (9 WAP) and 70 days after planting (10 WAP), respectively. The application of GA3 delayed the sprouting of shoot thus the increase in plant height, the production of leaves and the flowers were also delayed in the early stage. However, after 14 WAP the plant height and the number of leaves per a shoot became constant and those were not significantly different with the control plants. The rhizomes soaked with GA3 for 48 hours gave the latest flowering at 122 days after planting (17.4 WAP) about 34 days (5 WAP) later than the GA3-untreated control plants flowered at 88 days (12.5 WAP). The flower stalk and flower were elongated when the rhizomes are soaked in GA3 solution prior to planting. During flowering stage for each treatment, the N, P and K content of the aboveground part and the underground part organs were determined. Result, shows that rhizomes soaking with GA3 had effect on the amount of K in aboveground part and P in underground part. By soaking rhizomes for 48 hours, the amount of K in the aboveground part was highest at 654 mg, while the amount of P in the underground part is highest at about 120 mg when the rhizomes were soaked for 24 hours.
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