ผลของกรดจิบเบอเรลลิคและปุ๋ยสูตร 16-16-16 ต่อการเจริญเติบโตและระดับจิบเบอเรลลินของต้นมังคุด

Abstract

The objective of this study was to investigate the effect of gibberellic acid (GA3) concomitant with 16-16-16 fertilizer on growth and gibberellins of grafted and seedling mangosteen. Treatment was weekly spray with GA3 at 1,000 mlL1 with 16-16-16 fertilizer at 6 gram per pot for six months. It was found that the GA, treatments significantly accelerated growth of young mangosteen and resulted in the increase of plant height when compared to the untreated controls. Treatments of GA3 + fertilizer promoted shoot branching of grafted tree more than seedling mangosteen. All treatments had no effect on internode and leaf number and leaf size. However, the levels of gibberellins-like substances were not associated with the increase of tree height. Expression of GA20-oxidase was relatd to the increase height of mangosteen seedling treated by GA3+ fertilizer. In conclusion, application of GA, and fertilizer may be an approach to early terminate juvenile period in mangosteen seedling.