ISHS Acta Horticulturae 665: II International Symposium on Lychee, Longan, Rambutan and other Sapindaceae Plants
EFFECTS OF PANICLE THINNING AND APPLICATION OF GROWTH REGULATORS ON FRUIT SIZES AND QUALITY OF 'SHIXIA' LONGAN |
| Authors: | H.C. Wang, G. Hu, H.B. Huang, J.G. Li, X.W. Pan |
| Keywords: | uneven-sized fruit, pulp recovery rate, total soluble solid, anthesis, pericarp |
| Abstract:
‘Shixia’, a very popular and high quality longan cultivar in Guangdong and Guangxi of China, has a defect of uneven and small-sized fruit. Flowering panicle thinning and application of growth regulators were tested for their effects on fruit size, pulp recovery rate and total soluble solid (TSS). Removal of 30, 50 or 70% of the flowering panicles showed marked effect on fruit quality compared with the unthinned control. Thinned trees produced larger fruit with higher pulp recovery rate and TSS. Heavier panicle thinning resulted in higher TSS concentration in the pulp, yet such relation was not observed with pulp recovery rate. No difference in fruit size was observed between 50% thinning and 70% thinning, but 30% thinning resulted in smaller fruit size as compared with the two former treatments. None of the growth regulator treatments done at bloom had significant effect on the fruit quality, whereas treatments done on 15 days after anthesis showed varying results among growth regulators. Treatment with 6-benzyl aminopurine (BA) significantly increased fruit size, fruit weight, pulp recovery and TSS. Application of gibberellic acid (GA3) and 1-napphthaleneacetic acid (NAA) showed no effect. The pericarp of control and BA treatment were sampled to study the effect on the pericarp structure. Histological study demonstrated that BA treatment prolonged the duration of cell division and delayed the lignification of pericarp. | |
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