小麦品种对赤霉病抗扩展类型抗性组分的探索分析

本文探索了一种较客观地反映小麦品种对赤霉病抗扩展性的方法——抗性组分分析法。对13个品种双列杂交的后代,按 Griffing 方法Ⅱ模式Ⅰ研究了6个抗性组分的配合力。结果表明:供试品种各抗性组分真实存在,不同抗病品种阻止病菌扩展的方式不同;主穗轴发病和田间接种后15及25天的病级这三个组分可作为衡量品种抗扩展性的主要指

THE EXPLORING ANALYSIS OF THE RESISTANCE COMPONENTS TO THE RATE OF SPREADING OF SCAB IN WHEAT VARIETIES

Based on the process of scab extension,six resistance components wereset up in this paper.These components were those from inoculation toappearance of symptoms,from inoculated site to spikelet axis,the spreading of disease from spikelet axis to the head axis,and degree of thedisease of 15,20 and 25 days after inoculating.Results indicated thatthe resistance components of scab extension were present in varieties.The mode of inhibiting the pathogen was various in different resistantvarieties.The days of scab fungus spreading from inoculation site tomain head axis and degree of disease 15 and 25 days after inoculatingwere three important criteria in measuring the rate of spreading of disease.These resistance genes can be accumulated using the parents withdifferent good resistance components.This analysis method of resistance components to scab in wheat was a new approach to study the inheritance of resistance and to screen and utilize varieties with characterizing difference resistance components.