Korean Journal of Agricultural and Forest Meteorology (한국농림기상학회지)

Korean Society of Agricultural and Forest Meteorology (한국농림기상학회)
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Influence of Dormancy Level and Carbon Concentration on Freezing Hardiness in Bourse Shoot of 'Fuji' Apple Tree

휴면 정도 및 탄소 함량이 '후지' 사과나무 과대지의 내동성에 미치는 영향

  • Kweon, Hun-Joong (Apple Research Institute, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • Park, Moo-Yong (Apple Research Institute, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • Song, Yang-Yik (Plant Variety Protection Division, Korea Seed and Variety Service) ;
  • Sagong, Dong-Hoon (Department of Horticulture, Daegu University)
  • 권헌중 (농촌진흥청 국립원예특작과학원 사과연구소) ;
  • 박무용 (농촌진흥청 국립원예특작과학원 사과연구소) ;
  • 송양익 (국립종자원 품종보호과) ;
  • 사공동훈 (대구대학교 원예학과)
  • Received : 2016.08.22
  • Accepted : 2016.09.30
  • Published : 2016.09.30
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Abstract

This study was conducted to find out influence of dormancy level and carbon concentration on freezing hardiness in bourse shoot of 'Fuji' apple tree. Bourse shoot of 'Fuji' adult apple tree grafted on M.26 and M.9 rootstocks were used as experimental materials. Dormancy levels of bourse shoot were categorized according to the periods as follows the internal dormancy (late January), the early days after internal dormancy breaking (early February), the late days after internal dormancy breaking (late February), the bud break (late March), and the full bloom (late April). Chilling temperatures with bourse shoot were ranged from 0 to $-40^{\circ}C$. Also, the freezing hardiness according to carbon concentrations were investigated on 'Fuji'/M.9 apple tree that defoliated severely by Marssonina blotch (defoliation) and that of below the average 20 cm in shoot length through heavy crop load (weakness). Results showed that freezing hardiness of bourse shoot may become weaker after internal dormancy breaking. There was no differences in the carbon concentration of bourse shoot of 'Fuji' apple tree grafted on M.9 and M.26, so may be resulted in no difference in freezing hardiness both of bourse shoot grafted on M.9 and M.26 rootstock. Carbon concentration in bourse shoots with weakness and C/N ratio in bourse shoots with defoliation were lower than that of healthy. It may be shown that the freezing hardiness of defoliation and weakness were weaker than that of healthy.

본 시험은 휴면 정도 및 탄소 함량이 사과나무의 과대지 내동성에 미치는 영향을 밝히고자 실시하였다. 시험재료는 M.26과 M.9에 접목된 성목기 '후지' 사과나무의 과대지였다. 과대지의 휴면 정도는 자발휴면기(1월말), 자발휴면 타파 초기(2월초), 자발휴면 타파 후기(2월말), 발아기(3월말) 및 개화기(4월말)로 구분 하였다. 저온처리 범위는 $0^{\circ}C$부터 $-40^{\circ}C$ 사이였다. 탄소 함량의 차이에 따른 내동성은 갈색무늬병에 의해 낙엽이 심하게 발생한 '후지'/M.9 사과나무(낙엽구)와 과다결실에 의해 평균 신초장이 20cm 이하였던 '후지'/M.9 사과나무(수세가 약한 시험구)를 대상으로 조사하였다. 결과를 살펴보면, 과대지의 내동성은 자발휴면 타파 후에 약해졌다. M.9와 M.26에 접목된 '후지' 사과나무 과대지의 탄소 함량의 차이는 없었으며, M.9과 M.26 대목에 접목한 사과나무 과대지의 내동성 차이는 없었다. 건전구에 비해 낙엽구의 과대지는 C/N율이 낮았고, 수세가 약한 시험구는 탄소 함량이 낮았다. 이러한 결과에 의해 낙엽구와 수세가 약한 시험구의 내동성은 건전구보다 약하였다.

Keywords

References

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