GA(3)와 Thidiazuron 처리가 ‘거봉’ 포도의 무핵화와 과실품질에 미치는 영향

초록

This experiment was conducted to find the effects of a GA(3) and thidiazuron (TDZ) on seedless rate, harvest time, fruit cracking and fruit quality in 'Kyoho' grapes over two years from 2008 to 2009. In 2008, fruit clusters were dip treated with GA(3) 25.0 mg.L-1 twice at full bloom (FB) and 14 days after full bloom (DAFB) in a combination with TDZ 0 or 2.5 mg.L-1. Berry seedless rate and berry enlargement were slightly improved only when TDZ was added to the second GA(3) treatment at 14 DAFB, compared to GA(3) + TDZ treatments at both FB and 14 DAFB. However, berry cracking rate was significantly increased by any plant growth regulator (PGR) treatments compared to non treatment. In 2009, GA(3) at 12.5 mg.L-1 and 25.0 mg.L-1 was dip treated twice at FB and 14 DAFB while TDZ 2.5 mg.L-1 was treated only at 14 DAFB. Berry cracking rate was depended on the concentration of GA(3) applied. The higher concentration at 25.0 mg.L-1 significantly increased berry cracking rate while the lower concentration at 12.5 mg.L-1 had no effect. Also, the addition of TDZ to GA(3) 25.0 mg.L-1 at 14 DAFB, substantially decreased the cracking rate to the level of untreated control. Although all PGR treatments advanced fruit maturity, the most significant advance occurred when TDZ was added to GA(3) 12.5 mg.L-1 only at the second dip. Considering the overall aspects related to fruit maturity and quality, we concluded that the double applications of 12.5 mg.L-1 GA(3) at FB and 14 DAFB with addition of 2.5 mg.L-1 TDZ only at 14 DAFB was appropriate to produce about 400-500 g size of seedless 'Kyoho' grape cluster having 35-40 berries.

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