摘要： 用自然群体取样和同工酶遗传标记的方法对沼生植物野慈姑（Sagittaria trifolia Linn.）及其变型长瓣慈姑［S.trifolia Linn.f.longiloba(Turcz.)Makino］的异交率作了定量研究，3个自然群体的异交率估计值为=91.0％～98.0％，表明该种为异交占绝对优势的交配系统。在野慈姑各群体间未发现异交率的显著差异。
Abstract:The outcrossing rates of Sagittaria trifolia Linn.and S.trifolia Linn.f.longiloba(Turcz.) Makino,a helophyte species and a form under the species,were estimated by sampling from natural habitats and using isozyme locus as genetic marker.According to the values of outcrossing rates in 3 populations( =91.0％～98.0％),the mating system of the species studied was found to be dominated by outcrossing mechanisms.Statistical analysis suggested that there was no significant difference in outcrossing rates among the populations.