小麦品种慢叶锈性及其变异性和专化性研究

SLOW LEAF RUSTING,VARIABILITY AND SPECIFICITY IN WHEAT

本文研究了尤皮2号,黑芒麦,宜安52选,冀麦3号,平原50,阿夫和倌阳751七个小麦品种与小麦叶锈菌(Pucdnia recondita f.sp.tritici)的360、376、60、61四个小种的相互作用。在田间,慢锈品种的病害发展曲线下面积为0.6840—1.4928,而快锈品种尤皮2号的则为3.8499。在室内,慢锈品种与快锈品种相比,在各个抗性组份上均表现出病害发展慢的特性。然而当对品种不同发育阶段和采用不同浓度的菌量进行接种时,则慢锈性又表现出不同程度的变异性.对各组份的双向分组资料进行方差分析,都表明无论在品种间,小种间及两者的相互作用间,都存在着显著的差异。因此慢锈性也有专化性。在选育和利用慢锈品种时应予以高度的注意。

The interactions between seven wheat cultivars,Yupi 2,Heiwangmai,A-fu,Xinyang 751,Jimai 3,Yian 52 Xuan and Pingyuan 50,and four physiologic races 60,61,360,376 of Puccinia recondita f.sp.tritici have been studied.In field ex-periments,the areas under the disease progress curve of the slow rusting cultivars were 0.6840—1.4928,while that of the fast rusting cultivar was 3.8499.In green-house experiment,the slow rusting cultivars compared with the fast rusting cul-tivar showed“slowing”characteristics in every component of resistance.However,variability of slow rusting has been abserved in different developing stages of host and by using different amounts of inoculum.The two-way analysis of vari-ance on components of slow rusting showed that differences were significant ei-ther between cultivars,races,or the interaction between cultivars and eces.These specificities warn that a slow rusting cultivar may turn into fast rusting under different conditions.