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用棉花的4个品种(Stoneville 825,CABCS′-1-81,LE~2BOS-1-82和Tamcot CAMD-E)来鉴定从大豆、棉花和花生(编号为MP7,MP9,MP14)上分离到的菜豆球壳孢菌(Macrophomina phaseolina)的致病力。3个分离物对4个棉花品种均能侵染。花生分离物(MP14)致病力较强。受侵棉花幼苗较健株矮。病菌不需经伤口就能侵入。在幼苗阶段,品种TamcotCAMD-E和CABCS′-1-81对MP14更易感病,而品种Stonevill825较其他3个品种抗病。说明品种之间对M.phaseolina的抗性有差别。受害棉株有时表现为死株而不落叶,不严重时肉眼看不出根部伤痕,但主根的中柱部份以及根、主茎下部的木髓部变色,从棕褐色到黑色。从病部能分离到该菌的菌核。
Four varieties of cotton (Stoneville 825, CABCS’-1-81, LE-2BOS-1-82, and Tamcot CAMD-E) were identified for their isolation from soybean, cotton and peanut (codes MP7, MP9, MP14) Pathogenicity of Macrophomina phaseolina. Three isolates were able to infect 4 cotton varieties. Peanut isolate (MP14) is more virulent. Invaded cotton seedlings shorter than healthy plants. Germs can invade without wounds. In seedling stage, varieties TamcotCAMD-E and CABCS’-1-81 were more susceptible to MP14, while variety Stonevill825 was more resistant than the other three varieties. This shows that there is a difference between the varieties of M.phaseolina resistance. Occurred cotton plants sometimes appear dead without deciduous leaves, not the naked eye can not see the root scars, but the main root of the column and roots, the main stem of the Ministry of the Ministry of the Ministry of discoloration, from tan to black. From the disease can be isolated from the bacteria sclerotia.