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植物通过根的分泌物和根的脱落细胞对土壤微生物产生根际效应。这种效应因植物种类、生长发育阶段和土壤环境条件而不同。据报导,许多作物的抗病品种根际土传植物病原菌的数量比感病品种少得多,这可能与其根分泌物不利于病原菌孢子发芽有关。目前,抗枯萎病的棉花品种已在我国大面积推广种植。据反映,连种几年抗病棉后再种感病棉,棉枯病的发病率显著减轻。为探明抗病棉对土壤中棉枯病菌消长的影响,我们对具不同抗性的棉花品种根部和根际土壤中棉枯病菌的发育和数量进行了分析研究,结果如下。
Plants produce rhizospheric effects on soil microorganisms by the exudates of roots and exfoliated roots. This effect varies by plant species, stage of growth and development and soil environmental conditions. It is reported that the number of rhizosphere soil-borne pathogens in many crops is much less than that in susceptible varieties, which may be related to the fact that root exudates are not conducive to spore germination of pathogenic bacteria. At present, cotton varieties resistant to Fusarium wilt have been popularized in large areas in our country. According to reports, even a few years after the disease-resistant cotton and then a variety of susceptible cotton, the incidence of cotton blight significantly reduced. In order to find out the effect of disease-resistant cotton on the growth and decline of soil bacterial blight in soil, we analyzed and studied the development and quantity of the cotton bacterial blight in roots and rhizosphere soils with different resistance. The results are as follows.