이 연구는 2012년과 2013년 동절기에 아시아 배 품종인 신고와 추황배를 공시하여 생리화학적인 상태의 변화를 평가하기 위해 실시하였다.
추황배는 줄기에서 높은 수분부족과 수분함량을 보여 신고와 구별되었다. 겨울동안 줄기와 눈에서 화학성분이 다양하게 변화하였으며, 미네랄 성분은 줄기보다 눈에서 높게 나타났다.
두 품종 모두 겨울동안 줄기에서 포도당, 과당, 갈락토오스가 증가하였기 때문에 기관 발달과정에서의 식물의 생장반응과 온도의 변화에 따른 신진대사의 수준이 일정하게 유지되었다.
신진대사의 모든 과정은 상호 연관되며 그들 사이에 접합이 방해하는 이유는 시스템 전체의 안정성을 저하시키는 대사산물을 축적하기 때문으로 판단된다.

This study was conducted to evaluate the physicochemical changes of Asian pear cultivars ‘Niitaka’ and ‘Chuwhangbae’ during the winter of 2012 and 2013. Cultivar ‘Chuwhangbae’ distinguished with high water deficit and water content in shoots as compared with cv. ‘Niitaka’. However, water content of ‘Chuwhangbae’ was higher in buds than ‘Niitaka’. Chemical content in shoots and buds were varied during the winter season. Mineral compositions were higher in buds than in shoots, also values insignificantly varied and showed stable compared to shoots in both cultivars. During cold period in shoots of both cultivars significantly increased of glucose and fructose. Therefore, response of plants and the transition into the new level under action of the minus celsius degrees should be held equally at the all levels of the metabolism depending on the phase of development. All processes are interrelated and the backlog of any of them is the reason that leads to violation of conjugation between them, the accumulation of the metabolic products that reduce the stability of the entire system.

MATERIALS AND METHODS
  Plant materials
  Evaluation for water balance
  Evaluation of chemical composition in shoots andflower buds
  The climatic condition of winter season 2012 - 2013
 RESULTS
  Water potential of pear cultivars
  A chemical property of the pear cultivars during winter
 DISCUSSION
 적 요
 ACKNOWLEDGMENTS
 REFERENCES

• Sherzod Rajametov(National Agrobiodiveristy Center, NAAS, RDA, Jeonju, 560-500, Korea)
• Sam-Seok Kang(Pear Research Station, NIHHS, RDA, Naju 520-821, Korea)
• Yoon-Kyeong Kim(Pear Research Station, NIHHS, RDA, Naju 520-821, Korea)
• Hyung-Jin Baek(National Agrobiodiveristy Center, NAAS, RDA, Jeonju, 560-500, Korea) Corresponding author