Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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Influence of Thermal Treatments on Germination and Internal Compositions of 'Hongro' and 'Fuji' Apple Trees during Endodormancy

내재휴면기 온도처리가 사과 '홍로' 와 '후지'의 발아와 내부물질 변화에 미치는 영향

  • Cho, Jung Gun (Fruit Research Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Ryu, Suhyun (Fruit Research Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Lee, Seul-Ki (Fruit Research Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Han, Jeom Hwa (Fruit Research Division, National Institute of Horticultural & Herbal Science, RDA) ;
  • Jeong, Jae Hoon (Fruit Research Division, National Institute of Horticultural & Herbal Science, RDA)
  • 조정건 (국립원예특작과학원 과수과) ;
  • 류수현 (국립원예특작과학원 과수과) ;
  • 이슬기 (국립원예특작과학원 과수과) ;
  • 한점화 (국립원예특작과학원 과수과) ;
  • 정재훈 (국립원예특작과학원 과수과)
  • Received : 2019.07.22
  • Accepted : 2019.09.19
  • Published : 2019.10.30
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Abstract

In this study, we investigated the limit temperature range which is effective for dormancy release of 'Hongro' and 'Fuji' apples during the endodormancy period. The germination rate was 50% or more in all treatments except of 'Hongro' $-5^{\circ}C$ treatment. The germination rate of 'Fuji' was 86.3% at the temperature of $-5^{\circ}C$. The concentrations of carbohydrate and mineral components were significantly different between treatments but did not show any tendency or specific change. However, the sorbitol contents of 'Hongro' $-5^{\circ}C$ treatment were higher at 29.62 mg/g than those of 'Fuji', which was not affected for dormancy release. The results of hormone analysis showed that ABA(abscisic acid) and JA(jasmonic acid) in 'Hongro' $-5^{\circ}C$ treatment were respectively 176.48 and 15.72 ng/g. ABA, JA and SA(salicylic acid) contents in 'Fuji' apple tree were significantly lower than those of 'Hongro'. As a result of this study, the limit temperature range effective for dormancy release was different according to the varieties, and 'Hongro' did not affect with 30.3% of germination rate at $-5^{\circ}C$. However, 'Fuji' is 86.3% even at $-5^{\circ}C$ it was suggested that 'Fuji' had a chilling accumulation for dormancy release.

본 연구는 사과나무 '홍로'와 '후지'의 내재휴면 기간 중 휴면타파에 유효한 한계온도 범위를 알아보고자 수행하였다. 저온 축적에 의한 내재휴면 타파 여부를 확인하기 위하여 온도 처리구별로 발아율을 조사한 결과 '홍로' $-5^{\circ}C$ 처리구를 제외한 모든 처리구에서 발아율이 50% 이상으로 나타났다. 또한 '후지'의 온도 처리구별 발아율은 $-5^{\circ}C$ 처리구에서도 86.3%로 휴면이 타파되었다. 탄수화물과 무기성분의 변화는 처리간 유의한 차이는 있었으나 일정한 경향이나 특이한 변화를 나타내지 않았다. 그러나 유리당 분석 결과 sorbitol 함량은 휴면 타파 여부에 따라 휴면이 타파되지 않은 '홍로' $-5^{\circ}C$ 처리구의 경우 29.62mg/g으로 높게 나타났으며, 휴면이 타파된 것으로 판단되는 처리구는 낮은 수준이였다. 호르몬 분석결과 휴면이 타파되지 않은 '홍로' $-5^{\circ}C$ 처리구의 경우 ABA (abscisic acid)와 JA (jasmonic acid)는 각각 176.48, 15.72ng/g으로 높게 나타났으며, 모든 처리구에서 휴면이 타파된 것으로 나타난'후지'의 경우 ABA, JA, SA(salicylic acid) 함량이 '홍로' 품종보다 유의하게 낮게 나타났다. 본 연구 결과 휴면 타파에 유효한 한계온도 범위는 품종에 따라 다르며 '홍로'는 $-5^{\circ}C$에서 발아율이 30.3%로 휴면이 타파되지 않은 것으로 나타났으며, '후지'는 $0^{\circ}C$ 이하인 $-5^{\circ}C$에서도 86.3%로 높게 나타나 저온 축적의 효과가 있는 것으로 판단된다.

Keywords

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