关键词: 烟草品种, 南方根结线虫, 抗病性, 隶属函数, 聚类分析

Abstract: In order to comprehensively evaluate the resistance of tobacco varieties to M.incognita and select the disease resistance index, this study took 20 tobacco varieties as experimental material, measured their relative growth rate and relevant disease resistant indexes 60 d after artificial inoculation with M. incognita by seedling pot cultivation, and analyzed the test data by combining subordinate function with clustering analysis method. The results indicated that there were differences in relative growth rates and disease resistant indexes of 20 tobacco varieties infected by M.incognita. The result of clustering analysis on gall index was very similar to that of the other indexes, and there was less difference from that of clustering analysis on relative growth rates. The results of comprehensive identification on tobacco varieties gained from combining clustering analysis with subordinate function were consistent with the results of the other research method. Synthetically, the gall index can basically reflect the resistant level of tobacco varieties to M.incognita.

Key words: tobacco variety, M. incognita, disease resistance, subordinate function, clustering analysis