Effect of Concentration and Time of GA₃ Treatment on Flowering and Cut Flower Yield of Limonium spp. 'Ocean Blue'
2009
Chin, Y.D., Flower Research Institute, Gyeongnam Agricultural Research and Extension Services, Changwon, Republic of Korea | An, D.C., Flower Research Institute, Gyeongnam Agricultural Research and Extension Services, Changwon, Republic of Korea | Hwang, J.C., Flower Research Institute, Gyeongnam Agricultural Research and Extension Services, Changwon, Republic of Korea | Song, J.Y., Gyeongsang National University, Jinju, Republic of Korea | Jeong, B.R., Gyeongsang National University, Jinju, Republic of Korea
This study was carried out to investigate effect of GA₃ foliar application on the growth and flowering of Limonium spp. 'Ocean Blue' to develop an effective GA₃ treatment method for a year round commercial production. Plants were treated with different concentrations of GA₃ 0, 100, 200, 400, and 800 mgㆍL-¹ in summer, and 0, 100, 200, and 400 mgㆍL-¹ in winter at seven weeks after transplanting. The effects of GA₃ treatment time (0, 10, 20, 30, 40, and 50 days after planting) and plant age (raising during 3, 5, 7, and 9 weeks) was investigated. The GA₃ treatment advanced bolting and flowering with little difference between the two seasons. In a summer culture the effective concentration of GA₃ ranged from 200 to 400 mgㆍL-¹, while in winter it was found to be 400 mgㆍL-¹. The GA₃ treatment at 10 days after planting significantly reduced days to flowering. However, the greatest cut flower yield was observed in plants treated at 20 days after planting. The GA₃ treatment to different age plants did not show a significant effect, except in the oldest (nine weeks old plants). In conclusion, to induce early flowering in Limonium spp. 'Ocean Blue', the proper concentration and time of application of GA₃ was 400 mgㆍL-¹ GA₃ treated to nine weeks old plants at 20 days after transplanting.
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