【摘要】 棉花感病品种种植在含氟乐灵除草剂(2ppm)的育苗土中,能明显诱发棉苗对棉枯萎病(Fusarium oxysporum f.sp.vansinfectum)的抗性,抗病效果达70％。试验表明,该化合物无抑制棉枯萎病菌孢子萌发和菌丝生长的作用。经该化合物处理的棉苗受侵染率降低,病菌局限在子叶节以下。处理过的棉苗叶片蛋白图谱及薄层层析分析表明,氟乐灵除草剂诱发了棉苗产生新的抗菌物质。更多还原

【Abstract】 Seeds of susceptible cotton variety were shown into the soil containing Dinitroani-lines. After transplanting the cotton seedlings showed markly increase of the resistance a-gainst Fusarium wilt (caused by Fusarium oxysporum f. sp. vasinfectum , FOV). The index of induction effect for disease resistant reached 70%.Dinitroanilines are nonfungicidal compounds. Experimental results showed that the compounds did not inhibit FOV from growing, but did enhance the conidial germination and hyphal growth in the case of treated cotton seedlings. The rate of infection by FOV was less than that of control, and FOV was confined below the hypocotyl. Protein patters from treated cotton leaves differ from the control. The colour of one of the bands was apparently darker than that in cotrol. It indicates that the quantity of certain protein was increased. Extraction of fungitoxin substances from treated cotton tissue inhibited the pathogenic conidal germination or retarded the growth of the pathogen. The results of I. F. spectra, U. V. fluorescence and TLC stain were all different from those of control.更多还原