小麦品种抗条锈性多样化的选择利用

RESEARCH ON THE SELECTION AND UTILIZATION OF DIVERSITY OF WHEAT RUST RESISTANCE

用云南省小麦条锈菌优势菌系条中23号、条中25号、25—1及25—2分别在59个小麦品种(系)的苗期及成株期进行人工接种.排除苗期及成株期对四个菌系表现高度抗病的品种(系)之后,其余品种根据成株期的抗性公式作抗性分类,每一类型以其成株抗性公式中的抗毒性指数为指标进行筛选,抗毒性指数值≥0.5的类型均可入选.对入选类型进行抗性多样化的组配,按菌系计算每一组配毒性公式中的毒性指在任一组配中凡四个菌系的毒性指数值均≤O.5时即可入选.计算入选组配在每一菌系内成株感染苗期菌源的关系指数,关系指数值最小的组配被认为是抗性多样化的较佳组配.

The resistance to stripe rust of 59 wheat cultivars or lines had been identified by inoculation cultures CS23, CS25, 25-1, and 25-2 of Puccinia striiformis. By excluding cultivars resistant to the whole of tested cultures both in seedling and adult stage, other cultivars were classified into several types based on the reaction of resistance and susceptibility in adult stage. The reaction of any type that the adult had a ≥0.5 index value of antivirulence to these cultures was selected. Diversified combination could be combined by 3-5 various resistance types arbitrarily and then selected based on the index value of virulence for cultures CS23, CS25, 25-1 and 25-2; Each combination of diversity possessing b≤0.5 index value of virulence was selected. The relation indexes of adult infected with germs come from seedling stage were calculated one by one within selected sets. It suggested that cultivar combinations possessing the smaller telation indexes are theoietically one for resistance diversity.