KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)
- Volume 36 Issue 5
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- Pages.429-444
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- 1991
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- 0252-9777(pISSN)
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- 2287-8432(eISSN)
Physiological Characteristics Related to Cold Injury in Rice
수도 냉해에 관련된 생리적 특성 고찰
Abstract
Cold stress influence plant growth through a wide range of growth characters. Adverse effects of low temperature to plant growth come from results of colligative and complex physiological responses to cold stress. To evaluate more exactly cold tolerance of crop plant, it is needed to observe physiological changes induced by cold stress and to analyze relationships between intraspecific variations in physiological factors related to cold tolerance and the extent of cold tolerance in the field. Therefore, the composition and unsaturation ratio of fatty acids in phospholipid, a constituent of membrane, the transition-temperature in respiratory activity of mitochodria, the chlorophyll fluorescence as a factor related to photosynthesis were investigated in rice plant and data on these factors were compared with the degree of cold tolerance obtained in the field experiment. Also, effects of hardening and Mn++ treatment were evaluated as a method to reduce chilling injuries. The unsaturation ratio of fatty acids, whether rice plants were grown in a natural condition or under the chilling stress, was higher in the cold- tolerant varieties and was significantly correlated with the degree of cold tolerance (1-9) observed in the field experiment. And it was also increased by chilling treatment or hardening treatment, due to a reduction in palmitic acid content and an increase in linolenic acid content. The transition-temperature of respiratory activity of mitochodria isolated from etiolated rice seedlings (
수도품종의 내냉성 관련인자로서, 생체막 구성물질로서 중요한 역활을하는 phospholipid의 지방산조성과 지방산 불포화비율, 생체의 가장 중요한 대사과정의 하나인 호흡에 관련된 특성인 mitochondria의 호흡활성, 광합성된 엽록소 형광강도 등 여러가지 생리적 인자들과 내냉성과의 관계를 검토하고 내냉성 품종선발과 냉해를 경감시킬 수 있는 방법을 모색하고자 관련자료를 종합정리하였다. 1. 지방산의 불포화비율은 저온처리를 함으로서 높아지는 경향을 보였으며, 내냉성정도와 비교하여 볼 때 내냉성이 강한 품종에서 불포화비율이 높고 약한 품종에서 낮아 내냉성 정도와 일치하는 경향이었다. 2. 경화처리에 의하여 인지질의 지방산조성중 palmitic acid는 감소하고 linolenic acid의 함량은 증가되었으며 지방산 불포화비율이 대조구에 비하여 19~24% 증가되어 내냉성을 증가시킨 것으로 생각되었다. 3. 수도 백화묘(
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