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期 刊 ：植物保护学报 2005年

关键词：猕猴桃溃疡病；糖分；木质素；抗病性；

Keywords:Kiwifruit bacterial canker, soluble sugar, lignin, resistance,

摘 要 ：以安徽省猕猴桃主栽品种金魁、早鲜、魁蜜和金丰为研究对象,于展叶孕蕾期分别取发病的枝条、叶片,以未发病的健株相应组织为对照,采用生理生化的方法,分析枝条、叶片中木质素和可溶性糖的含量变化以及与抗溃疡病的关系。结果表明:抗病品种金魁健株枝条、叶片中可溶性糖及木质素含量显著高于感病品种金丰。自然发病后,抗感病品种枝条、叶片中可溶性糖含量都降低,感病品种降低更多,金魁叶片可溶性糖含量下降4.20%,金丰叶片可溶性糖含量下降55.35%;木质素含量都升高,且抗病品种金魁叶片中的木质素含量比感病品种金丰高得多,其变化率分别为7.17%、3.01%,枝条中的木质素含量变化率分别为110.39%、68.98%,其差异达到显著水平。相关分析表明,枝条中木质素、可溶性糖含量与品种发病率也呈负相关,r分别为-0.9583和-0.9282;叶片中木质素、可溶性糖含量与品种发病率呈负相关,r分别为-0.8099和-0.8266。从而说明枝条、叶片中可溶性糖及木质素含量与品种抗性呈正相关。抗感品种淀粉含量无明显规律性变化,与品种抗性关系不大。

Abstract:By means of methods for physiology and biochemistry, the content of lignin and soluble sugar in twig and foliage of kiwifruit cultivars, Jinkui, Zaoxian, Kuimi and Jinfeng, with different levels of resistance to kiwifruit bacterial canker infected by Pseudomonas syringae pv. actinidiae were compared in conditions of infection or not. The results showed that the contents of lignin and soluble sugar in the annual twig and foliage of healthful resistant cultivars were significantly higher than those in susceptible cultivars before natural infection. After natural infection, the content of soluble sugar decreased in the annual twig and foliage of both resistant and susceptible cultivars, and content of soluble sugar in susceptible cultivars decreased much more than those in resistant cultivars, the content of lignin increased in the annual twig and foliage of both resistant and susceptible cultivars, and the content of lignin in resistant cultivars increased much more than those in susceptible cultivars. The decrease percentage of the content of soluble sugar in the foliage of Jinkui and Jinfeng was 4.20% and 55.35%, respectively. The increase percentage of lignin content in foliage of Jinkui and Jinfeng was 7.17% and 3.01%, respectively. The increase percentage of lignin content in twig of Jinkui and Jinfeng was 110.39% and 68.98% , respectively. The means are significantly at 5% level. Related coefficient between content of lignin and soluble sugar in twig of kiwifruit cultivars and incidence were -0.9583 and -0.9282, respectively, and in foliage was -0.8099 and -0.8266, respectively, These data indicated the cultivars resistance related to the contents of lignin and soluble sugar in the annual twig and foliage. But the contents of starch were no significant disciplinary changes in the annual twig and foliage between resistant and susceptible cultivars in pre and post natural infection, and it was not necessarily associated with the resistance level.

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