小麦不同生育期抗蚜机制研究

利用组织切片、氨基酸自动分析技术和因子分析方法对田间抗蚜性能稳定的4个小麦品种（系）不同生育期的抗蚜机制进行了初步研究。结果表明，小麦抗蚜性能在返青后至灌浆期与受害部位表层细胞外壁厚度成正相关，在抽穗期与细胞密度成正相关，而与细胞间隙、细胞层厚度相关不同生育阶段的氨基酸组成比例和特征氨基酸不同，酷氨酸、蛋氨酸、组氨酸、苏氨酸、丝氨酸、异亮氨酸、亮氨酸等含量抗蚜性呈正相关，但有阶段性变化。在中高抗蚜品种中以蛋氨酸、组氨酸、酪氨酸组为稳定，且保持长期相对抗或感虫品种的水平，可作为判别抗性强弱的依据。

Comparative Study on Winter Wheat Resistance to Aphids in Different Developmental Stage

The winter wheat resistance mechanism to aphids in different developing stage was studied in 4 winter wheat varieties of different resistance level in fields by means of anatomy and hydroxanomic acids analysis.Ths result showed that wheat resistance to aphids has objective relevance with the surface layer thickness of exterior cell in all test developing stage and the sites that aphids spite more likely,but no relationship between resistance and the gap or the thickness of exterior cells.In the stage of ear emerging,objective relevance also existed with density of exterior cells.The composition of amino acid and the feature amino acids were different in different wheat developing stages.Generally the content of Tyr,Met,His,Thr,Ser,Ile,Leu etc. has objective relevance with wheat resistance.Among them the ratio of Met,Tyr,His kept higher and steady in high resistant wheat varieties,which could be used as standards of resistance of winter wheat in the utilization of resistant genetic materials.