猕猴桃品种对细菌性溃疡病的抗性机制

研究了安徽省猕猴桃主栽品种金魁(高抗)、早鲜(中抗)、魁蜜(抗病)、华美2号(感病)、秦美(中感)和金丰(高感)对细菌性溃疡病的抗性机制.结果表明:形态结构抗性方面,感病品种的皮孔密度和长度及气孔密度、长度和宽度都明显高于抗病品种,抗、感品种间皮孔、气孔的排列方式也存在一定差异.相关分析表明,皮孔密度和长度及气孔密度、长度和宽度与品种发病率都有较高的相关性,尤其以皮孔长度和气孔长度相关性最高,r分别为0.9278和0.9794;生理生化抗性方面,品种未感染溃疡病菌前,芽中的POD酶活性与品种抗性存在规律性不强,一年生枝条、叶片中的POD酶活性与品种抗性有密切关系.品种感染溃疡病菌后,POD酶活性均升高,但抗病品种中酶活提高倍数高于感病品种.一年生枝条上病斑越大,POD酶活性越高.POD同工酶谱带表现出与酶活相一致的规律.

Resistance mechanism of kiwifruit cultivars to Pseudomonas syringae pv. actinidae

In order to investigate resistance mechanism of kiwifruit varieties to Pseudomonas syringae pv.ac- tinidae,experiments were conducted with the main cultivars of kiwifruits,Jinkui(HR),Zaoxian(MR), Kuimi(R),Qinmei(S),Huamei 2(MS),and Jinfeng(HS),in Anhui Province.The morphological re- sults showed that branch skin hole density,length and blade stoma density,length and width of susceptible varieties were larger than those of resistant varieties.Meanwhile,they were in correlation with disease inci- dence.There were differences in skin hole and stoma lining situation among the varieties,too.The physiologi- cal and biochemistry results showed that POD activity in bud was not much regular with different varieties, while POD activities in branch of one year and leaf were significantly correlated with different varieties prein- fection.POD activity ascended both in susceptible and resistant varieties postinfection,but it increased faster in resistant varieties than in susceptible varieties.And the bigger the spot was,the higher POD activity was. The changes of POD isozyme were similar to those of POD activity.