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柑桔抗寒性与其膜脂脂肪酸组分的关系研究

STUDIES ON THE FATTY ACIDS COMPOSITION OF THE CITRUS CELL MEMBRANE AND ITS RELATIONSHIP WITH THE COLD RESISTANCE

  • 摘要: 作者采用气相色谱法对5年生宜昌橙、本地早、国庆一号、锦橙、沙田柚枳砧嫁接树,在抗寒锻炼过程中叶片的膜脂脂肪酸含量的变化进行了研究.结果表明:在日均温为24℃左右时,柑桔叶片开始积累不饱和脂肪酸,冬季叶片不饱和脂肪酸含量最高,比夏季要高60%以上,春季解除抗寒锻炼时,叶片膜不饱和脂肪酸含量下降,饱和脂肪酸含量上升.膜不饱和脂肪酸的积累与气温呈负相关关系.冬季叶片、茎韧皮部和叶绿体等组织器官的膜脂脂肪酸不饱和度、亚麻酸与亚油酸的比值,以及种子中亚油酸与棕榈酸含量之比,均与柑桔品种的抗寒性成正相关.

     

    Abstract: Using 5 yearsold grafted trees of Citrus ichangensis, Bendizao Tangering (C.regiculata), and Jincheng sweet orange (C.sinensis) to study their cold resistance and their fluctuation of the fatty acid composition in the leaf lipids in winter, experimental results showed that in the average diurnal temperature of 24℃, citrus leaves began to accumulate unsaturated fatty acids. When temperature droped from 13℃ to 7℃, the content of the unsaturated fatty acids in the citrus leaves had a rapid increace. The amount of unsaturated fatty acid in winter was about 60% higher than that in the summer. During spring, the amount of unsaturated fatty acids was decreasing, while that of saturated fatty acids was increasing. It seemed that there was a certain correlation between the unsaturated fatty aeids and cold resistance in the citrus species. The amount of unsaturated fatty aeids of these species in the leaves and seeds were coindental correlated with the cold resistance of the species.

     

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