Abstract: Dongxiang wild rice regenerated by ratooning from nodes of lodged and burried stems, no seedlings were found in spring based on several investigations on its natural population. And it showed mainly the characteristics of perennial O. rufipogon at life-historical traits, indicating that it is a exclusively perennial type. The principal component analysis of plants characters within its natural population showed the trend to differentiate into annual and perennial types accompanying with the change of water condition in its niche. Moreover, there are some differences of some characters between two subpopulations Linchang and Shuitao Tree. ReplaceFont('ChDivSummary','对东乡野生稻自然群体内植株的形态性状及生态进行调查，发现东乡野生稻完全是靠休眠芽（地下茎节或未枯死的地上茎节处）来进行无性繁殖，没有种子苗的出现，在生活史性状上也表现为多年生普通野生稻的特征，这表明东乡野生稻确为多年生类型的普通野生稻。然而其性状的主成分分析却揭示出它处于多年生—一年生分化的初始阶段，这种分化可能与其生境中的水分变化有关。生境中的水分状况还与植株的生长习性和芒的颜色有密切关系，匍匐、倾斜类型及具红色长芒的野生稻倾向于生长在常年有一定积水的地方。另外，林场和水桃树下两个群落之间在一些性状上存在相当的差异。');ReplaceFont('EnDivSummary','Dongxiang wild rice regenerated by ratooning from nodes of lodged and burried stems, no seedlings were found in spring based on several investigations on its natural population. And it showed mainly the characteristics of perennial O. rufipogon at life-historical traits, indicating that it is a exclusively perennial type. The principal component analysis of plants characters within its natural population showed the trend to differentiate into annual and perennial types accompanying with the change of water condition in its niche. Moreover, there are some differences of some characters between two subpopulations Linchang and Shuitao Tree.');if(document.getElementById('ChDivSummary') != null && document.getElementById('ChDivSummary').innerHTML!=""){CutSpan('ChDivSummary',500);DisplaySpanDiv('ChDivSummary');ClearSummaryOnLoad('SummaryLinkChID','SummaryLinkEnID');} if(document.getElementById('EnDivSummary') != null && document.getElementById('EnDivSummary').innerHTML!=""){CutSpan('EnDivSummary',1000);DisplaySpanDiv('EnDivSummary');ClearSummaryOnLoad('SummaryLinkEnID','SummaryLinkChID');}ReplaceChar1('ChDivSummary');ReplaceChar('ChDivSummary');ReplaceChar1('EnDivSummary');ReplaceChar('EnDivSummary');

Key words: annual, character variation, differentiation, natural population, perennial, wild rice

摘要： 对东乡野生稻自然群体内植株的形态性状及生态进行调查，发现东乡野生稻完全是靠休眠芽(地下茎节或未枯死的地上茎节处)来进行无性繁殖，没有种子苗的出现，在生活史性状上也表现为多年生普通野生稻的特征，这表明东乡野生稻确为多年生类型的普通野生稻。然而其性状的主成分分析却揭示出它处于多年生—一年生分化的初始阶段，这种分化可能与其生境中的水分变化有关。生境中的水分状况还与植株的生长习性和芒的颜色有密切关系，匍匐、倾斜类型及具红色长芒的野生稻倾向于生长在常年有一定积水的地方。另外，林场和水桃树下两个群落之间在一些性状上存在相当的差异。

关键词: 野生稻, 自然群体, 多年生, 一年生, 分化, 性状变异