Acoording the ploidy analysis of chromosome, sequences and the survey of cultivation in field, Opisthopappus is primarily divided into two species.
结合这两个种的染色体倍性鉴定、序列分析和栽培观察实验，初步确定划分为两个种。
The single chromosome obtained in the study is rice field eel chromosome 3;
杂交结果显示，本研究所获得的单条染色体是黄鳝3号染色体；
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