论文部分内容阅读
为探索同化产物分配利用与苜蓿耐蓟马的关系,本试验以扦插的抗蓟马苜蓿无性系R-1和感蓟马苜蓿无性系I-1为材料,研究不同虫口牛角花齿蓟马为害对苜蓿的抗性、根、茎和叶生长特性及可溶性糖含量的影响.结果表明:随着虫口压力的增大,R-1和I-1苜蓿的受害指数升高;在相同虫口压力下,R-1苜蓿的受害指数显著低于I-1.受蓟马为害后,R-1和I-1苜蓿株高降低、叶面积减少、茎秆变细、节间长变短、节间数增加,根颈和主根直径加粗、侧根增多.在低虫口密度下,随虫口压力增大,R-1和I-1苜蓿地上部生物量增加,根冠比下降,分配到茎的生物量比例升高;在高虫口密度下,地上部生物量随虫口压力增大而减少,根冠比增加,分配到根系的生物量比例升高;R-1根冠比和茎生物量比例随虫口压力变化曲线的拐点均为每枝条5头,I-1根冠比和茎生物量比例随虫口压力变化曲线的拐点均为每枝条3头.在低虫口压力下,R-1苜蓿茎和叶中的可溶性糖含量随虫口压力增加而升高;在高虫口压力下,茎和叶中的可溶性糖含量随虫口压力增加而下降;根中可溶性糖含量随虫口压力增加持续下降.I-1根、茎和叶中的可溶性糖含量均随虫口压力增加持续下降.牛角花齿蓟马为害后,R-1根、茎和叶的农艺性状及抗性比I-1好,对同化产物的分配利用率高.
In order to explore the distribution of assimilation products and the relationship between alfalfa and thrips, we studied the effects of different anti-thrips alfalfa clones R-1 and sense-thrips alfalfa clones I-1 On the growth of alfalfa, the growth characteristics of roots, stems and leaves and the content of soluble sugar.The results showed that the damage index of alfalfa with R-1 and I-1 increased with the increase of the pressure in the mouth; , And the damage index of R-1 alfalfa was significantly lower than that of I-1.After the thrips were damaged, the plant height of R-1 and I-1 alfalfa decreased, the leaf area decreased, the stems became thinner, the internodes became shorter, Under the low insect population density, with the increase of insect population pressure, the aboveground biomass of R-1 and I-1 alfalfa increased, the root-shoot ratio decreased, and the biomass distributed to the stem The biomass of shoots increased with the increase of insect population pressure. The root-shoot ratio increased and the proportion of biomass distributed to the roots increased. The ratio of root-shoot ratio and stem biomass of R-1 The inflection point of the pressure curve of insect mouth was 5 heads per branch. The inflection point of the ratio of I-1 crown and stem biomass with the pressure curve of insect mouth was Each branch 3. Under low insect pressure, soluble sugar content in stems and leaves of R-1 alfalfa increased with the increase of insect population pressure; under high strain pressure, soluble sugar content in stem and leaves increased with insect pressure , And the content of soluble sugar in root decreased continuously with the increase of insect population pressure.The content of soluble sugar in roots, stems and leaves of I-1 all decreased with the increase of insect population pressure.After root damage, Leaf agronomic traits and resistance better than I-1, the assimilation product distribution and utilization of high.