Correlation analysis between structural characteristics of pod skin and stab-sucking damage of Riptortus pedestris
This study aims to explore the piercing-sucking damage preference and mechanism of Riptortus pe-destris Fabricius to pods of different soybean varieties.Forty soybean varieties were planted at the same density in separate nets and inoculated with R.pedestris,and their piercing-sucking damage to pods of different soybean vari-eties was observed.The pierced points per pod,percentage of pierced pods,pierced points per seed,and percentage of pierced seeds were counted.The pod surface characteristics and the anatomical characteristics of pod skin were measured at the seed-filling stage.The correlations of R.pedestris damage with pod surface characteristics(pod hair density and length)and anatomical characteristics of pod skin were analyzed.The results showed that no more than 5%of the 40 test varieties were subjected to too high or too low piercing-sucking frequency of R.pedestris.The pref-erence and damage of R.pedestris varied among different varieties.The density and length of pod hairs and the thick-ness of pod skin and each anatomical layer also varied among different soybean varieties.The pierced points per pod and the percentage of pierced pods had significantly positive correlations with the pierced points per seed and the percentage of pierced seeds,respectively.The pierced points per pod and the percentage of pierced pods had negative correlations with pod hair density,pod hair length,and pod skin thickness and significantly negative corre-lations with the thickness of the inner cell tissue layer of the pod.The relationship between the pierced points per pod and the thickness of inner cell tissue layer was in accordance with the linear equation ypod=4.533-0.015x(F=6.271,P=0.013,r=-0.389)and that between the pierced points per seed and the thickness of inner cell tis-sue layer conformed to the linear equation yseed=1.579-0.005x(F=5.133,P=0.022,r=-0.362).The results indi-cated that the pod skin characteristics of soybean directly affected the piercing-sucking damage degree of R.pedes-tris.The soybean varieties with denser and longer pod hairs and thicker pod skin were generally subjected to milder damage,thus demonstrating stronger resistance.The thickness of the inner cell tissue layer of pod skin was the most significant factor affecting the resistance.The findings can provide a scientific basis for the selection and resistance evaluation of R.pedestris-resistant soybean varieties.
万方数据
维普
