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黄萎病严重危害棉花生产。本试验以温室种植31个不同抗性的棉花品种为材料,通过对供试品种的组织结构研究,使用根系扫描法和石蜡切片法,了解棉花对黄萎病的抗性机制。结果如下:棉花根系的吸收根根长密度与相对病指呈显著正相关,相关系数为0.923;抗病品种与耐病品种、感病品种的总长度、总投影面积、总表面积和吸收根根长密度差异显著,但耐病品种与感病品种的这4个指标差异不显著。抗病材料根、茎的组织中薄层细胞密度大于感病材料,耐病品种根、茎的薄层细胞密度介于两者之间;抗病品种的根和茎的导管数最多,导管直径最小,其次是耐病品种,感病品种的根和茎中导管数最少,但是导管直径最大。棉花根系的吸收根根长密度,根和茎的薄层细胞密度,导管数可以作为对黄萎病抗性的检测指标。
Verticillium wilt severely endangers cotton production. In this study, 31 cotton cultivars with different resistances were planted in greenhouse. The mechanism of cotton resistance to Verticillium wilt was studied by studying the tissue structure of the tested cultivars, root scanning method and paraffin section method. The results were as follows: The root length density of cotton root absorption was significantly and positively correlated with relative disease index, and the correlation coefficient was 0.923. The total length, total projection area, total surface area and absorbed root length of resistant varieties and resistant varieties, The difference of density was significant, but there was no significant difference between these 4 indexes of resistant and susceptible varieties. The density of thin layer cells in root and stem tissues of disease-resistant material was higher than that in susceptible materials. The thin-layer cell density of roots and stems of resistant varieties was in between. The diameter of roots and stems of the disease- , Followed by resistant varieties. The susceptible cultivars had the lowest number of catheters in the roots and stems, but the largest in diameter. Cotton root length absorption root length density, root and stem thin layer cell density, the number of catheters can be used as a test of resistance to Verticillium wilt indicators.