160个春大豆品种豆荚结构及其对食心虫抗性相关分析

为进一步解析大豆品种对大豆食心虫的结构抗虫性机制，明确其量化指标，对160份东北中部春大豆品种的豆荚表观结构特征进行分析，并从中筛选出41个单因子结构特征梯度品种，分别进行大豆食心虫成虫对不同品种荚毛指标的产卵选择性试验和初孵幼虫对不同品种荚皮层钻蛀试验。结果表明：160个品种荚毛密度、荚毛长度、荚皮表皮角质层、皮下厚壁细胞层、中果皮细胞层、内壁细胞组织层厚度的频次分布分别呈现一定规律性。荚毛密度与单荚落卵量呈极显著正相关，荚毛密度越大，豆荚落卵量越多，符合逻辑斯蒂方程y单荚卵量=6.22/1+exp(3.17-0.88x荚毛密度)]；荚毛长度与单荚落卵量呈显著负相关，符合二次曲线方程y单荚卵量=-23.98+27.82x荚毛长度-6.89x2荚毛长度，当荚毛长度大于2.00mm时，随着荚毛长度增加而落卵量减少。表皮角质层和皮下厚壁细胞层厚度与初孵幼虫入荚率之间相关不显著，而中果皮细胞层和内壁细胞组织层厚度与初孵幼虫入荚率之间均呈极显著负相关，分别符合指数函数曲线方程z入荚率=142.94exp(-0.70x中果皮)，逻辑斯蒂方程z入荚率=103.64/1+exp(-5.28+20.29x内壁)]，表明大豆品种荚皮中果皮细胞层和内壁细胞组织层越厚，抗虫性越强。该结果可为选育大豆抗食心虫品种及评价品种抗虫性提供科学依据。 

Structure of soybean pod of 160 spring soybean varieties and analysis of resistance to Leguminivora glycinivorella

In order to further analyze soybean structure mechanism of resistance to soybean pod borer Leguminivora glycinivorella and define its quantitative indicators, 160 spring soybean materials from northeast China were selected to study the characteristics of pod surface structure, forty-one of gradient varieties with single factor structure characteristics were screened. The investigation of oviposition selecting of Leguminivora glycinivorella to soybean varieties with different pod hair and the newly hatched larvae boring in different varieties of pod shell were carried out respectively. The results showed that the frequency distributions of pod hair density, pod hair length, cuticular layer, subcutaneous thick cell layer, middle epidermis cell layer, inner wall cell layer thicknessof 160 breeds showed certain regularities, which can be represented by equation models. Pod hair density had significant positive correlation to single pod egg deposition number. The greater the pod hair density, the more egg of Leguminivora glycinivorella on the pods, which was consistent with the Logistic equation ySingle pod egg loss=6.22/(1+exp(3.17-0.88x)). Significantly negative correlation existed between pod hair length and single-pod egg amount, which was consistent with the quadratic equation ySingle pod egg loss=-23.98+27.82x-6.89x2. When the length of pod hair was more than 2.00mm, the amount of eggs decreased with the increase of the length of pod hair. There was no significant correlation between the thickness of epidermal cuticle and the thickness of the subcutaneous thick-walled cell layer and the pod rate of newly hatched larvae. Though the thickness of mesocarp cell layer and endothecium cell layer was negatively correlated with the boring rate of newly hatched larvae and the exponential function curve equation fitted zMedium peel==142.94exp(-0.70x), Logistic equation zInner wall=103.64/(1+exp(-5.28+20.29x)), respectively. It showed that the thicker the mesocarp cell and endothecium cell layer, the stronger resistance to Leguminivora glycinivorella. The results would provide scientific basis for breeding soybean varieties resistant to soybean pod borer and for evaluating insect resistance.