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ISSN : 1229-3571(Print)
ISSN : 2287-819X(Online)
Korean Journal of Organic Agricultue Vol.23 No.2 pp.267-280
DOI : https://doi.org/10.11625/KJOA.2015.23.2.267

Growth of ‘Wonhwang’ Pear Trees and Regrowth Rates of StemCuttings in Vitro as Affected by Time and Degree of Defoliation

Byeong-Sam Kim***, Kyung-Chul Cho***, Bong-Ki Yun***, Seok-Kyu Jung****, Hyun-Sug Choi**, Jeom-Hwa Han*****

* 본 연구는 전남농업기술원의 기후변화 대응 과수 안전재배지대 설정 연구(PJ008224)를 위한 시험사업으로 수행되었으며 대구가톨릭대학교 원예학과의 지원에 의하여 이루어진 것임.

* Corresponding author, 대구가톨릭대학교 원예학과(hchoiuark@gmail.com)
March 5, 2015 March 10, 2015 March 10, 2015

Abstract

The study was conducted to evaluate effects of time and degree of defoliation on growth of ‘Wonhwang’ pear (Pyrus pyrifolia Nakai) trees managing with low pesticides as well as regrowth of cuttings in vitro. Treatments included degree of defoliation (20% and 60%) with time of defoliation (Early-Aug, End-Aug, and Early-Sep); Early-Aug (20%), Early-Aug (60%), End-Aug (20%), End-Aug (60%), Early-Sep (20%), Early-Sep (60%), and No defoliation. No defoliation and Early-Sep (20%) defoliation increased growth of water sprouts and new shoots, which were improved by delayed defoliation or 20% of defoliation. Total-C, total-N, B, and free sugar contents increased in No defoliation-shoots but decreased in End-Aug (60%)-shoots. Delayed defoliation increased total-C, total-N, and free sugar in shoots, with high contents of C, K, Ca, Mg, and B observed for 20% of defoliation-trees. Fruit yield and weight or fruit length increased in No defoliation, End-Aug (20%) defoliation, and Early-Sep (20%) defoliation, but reduced in End-Aug (60%). Fruit soluble solids content reduced in defoliation in August. Time of defoliation did not affect the fruit yield and fruit quality, while degree of defoliation influenced yield and fruit weight and length. Defoliation at End-Aug (60%) mostly increased the leakage rates of the stem cuttings at –18℃ and –21℃ in vitro and reduced the germination rates at –24℃ and –27℃. Under comparison of time and degree of defoliation, the Early-Sep defoliation increased germination rates of the stem cuttings at –27℃ in vitro, and 60% of defoliation decreased the germination rates compared to the 20% of defoliation.


적엽시기와 수준에 따른 ‘원황' 배나무의 수체생장과기내 삽수의 재생장율 비교*

김병삼***, 조경철***, 윤봉기***, 정석규****, 최현석**, 한점화*****
**대구가톨릭대학교 원예학과
***전남농업기술원
****대구가톨릭대학교 원예학과
*****원예특작과학원 과수과

초록


    Rural Development Administration
    PJ008224

    Figure

    Table

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