两种生物型江都杂草稻不同栽播密度对水稻生长的影响及其与栽培稻的亲缘关系

 以两种生物型的江都杂草稻为材料，考查了杂草稻的生物学性状并对其进行了SSR分析, 旨在确定江都杂草稻的生物类型、遗传特性以及对栽培稻产量的影响。结果表明：杂草稻可分为两个生物型，一类是矮秆类型，包括JDWR A和JDWR C;一类是高秆类型，包括JDWR B。两种类型的杂草稻均属于籼型杂草稻。JDWR A与JDWR C亲缘关系较近，矮秆类型的杂草稻与高秆类型的杂草稻亲缘关系较远，而与杂交稻不育系亲本珍汕97A的亲缘关系较近。杂草稻与栽培稻的田间竞争实验表明，矮秆类型的杂草稻对栽培稻产量因子的影响更为严重。

Effect of Two Biotypes of Jiangdu Weedy Rice at Various Transplanting Densities on Growth of Cultivated Rice and Their Genetic Relationship

To explore biotypes,genetic characteristics of weedy rice in Jiangdu,Jiangsu Province,China,and their genetic effect on yield of cultivated rice,morphological characteristics were detected and cluster analysis was conducted based on SSR markers.The results showed that the weedy rice materials can be divided into two biotypes: One is dwarf,including JDWR-A and JDWR-C,the other one is tall,including JDWR-B;the two biotypes of weedy rice belong to indica,JDWR-A was most related to JDWR-C,the dwarf type of weedy rice was distantly related to the tall type,and closely related to indica male sterile line Zhenshan 97A.The competition test between weedy rice and cultivated rice indicated that the dwarf type of weedy rice more significantly influenced on yield factors of cultivated rice.