【摘要】 使用全国鉴定的18个抗病品种:特特普、砦糖、赤块矮选、农试4号、窄叶青8号、宁晚1号、晚付1号、谷农13、城堡1号、温选10号、大艮鱼、矮脚白米籽、红脚占、湘矮早9号、红410、金围矮、顺良早2号、珍龙13和1个感病品种朝六早。幼苗追施不同量的氮肥,分别接种菌株75-49和75-49-2,结果表明可将品种分为三类:第一类抗供试菌株,且不随氮肥水平发生任何变化。如前12个品种对2个供试菌株的反应和红脚占对75-49的反应,这些品种对供试菌株可能有主效抗性基因。第二类品种感供试菌株,但低氮水平发病轻,病情随施氮水平增加而加重。如湘矮早9号、红410、金围矮、顺良早2号和珍龙13对2个供试菌株的反应。这类品种虽无主效抗性基因,但可能有微效抗性基因。第三类品种对供试菌株感染,不论低氮和高氮水平发病都重,如朝六早对2个菌株的反应。这类品种可能无抗性基因。前两类品种γ-氨基丁酸和果糖、葡萄糖含量比朝六早多,而丙氨酸、谷氨酸、谷氨酰胺、天冬氨酸和天冬酰胺含量则较少。这些成份可能与微效基因控制的低水平抗性有关。更多还原

【Abstract】 Eighteen resistant varieties with one susceptible check were grown at different nitrogen levels and inoculated with blast fungus (strains 75-49 and 75-49-2) at Seedling stage.According to the influence of nitrogen levels on resistance to blast, the resistance of varieties tested,were classified into 3 groups. Group 1:12 varieties were resistant to the strains tested and showed no difference in reaction at various nitrogen levels. The varieties included Tetep, Zhai-tang, Chi-Kuai-ai-xian, Nong-shi 4, Zhaiye-qing 8, Ning-wan 1, Wan-fu 1, Gu-nong 13, Toride 1, Wen-xiaa 10, Da-gen-yu and Ai jiao-bai-mi-zi. The variety Hong-jiao-zhan was resistant to strain 75-49. The resistance might be controlled by major gene(s). Group 2:5 varieties, Xiang-ai-Zao 9, Hong410,Jin-wei-ai, shun-liang Zao 2 and Zhen-long 13, were comparatively susceptible to 2 strains, wtile Hong-jiao-zhan only susceptible to strain 75-49-2, their susceptibilities wcre increased as the nitrogen level increased. These varieties were considered to possess minor resistance genes. Group 3: only one variety (Chao-liu-zao)was severely susceptible at whatever nitrogen levels. It contained no resistant: gene to the test strains. The content of γ-aminobutyric acid, glucose and fructose of group 1 and 2 varieties was more than that of group 3,whereas group 1 and 2 contained less alanine, asparatic acid, asparagine, glutamic acid and glutamine than group 3.更多还原