在江西婺源的浙江红山茶天然林分里发现少量的白花变异植株,花色在White Group NN155B~C之间。白花变异植株树型、叶型、果型与浙江红山茶原种整体差别不大。为鉴定这类变异植株是新物种亦或是原种变种或变型,本文利用RPB2低拷贝核基...在江西婺源的浙江红山茶天然林分里发现少量的白花变异植株,花色在White Group NN155B~C之间。白花变异植株树型、叶型、果型与浙江红山茶原种整体差别不大。为鉴定这类变异植株是新物种亦或是原种变种或变型,本文利用RPB2低拷贝核基因标记开展红山茶组与油茶组主要近缘种的分子甄别。研究结果显示,各山茶属物种的kimur2-parameter平均距离为0.019,与各近缘种比较,浙江红山茶与油茶组的越南油茶、普通油茶有更近的亲缘关系。浙江红山茶原种与白花变异kimur2-parameter距离仅为0.005,远小于各近缘种间距离。系统发育树显示包括白花变异的浙江红山茶不同个体能按同一物种聚成一类与其他物种分离,结果支持白花变异作为浙江红山茶变异类型进行归并。研究将浙江红山茶与其近缘种区分出来,进一步为生产应用中浙江红山茶种真实性甄别提供了可靠的研究方法,同时也为浙江红山茶白花新品种考证提供了重要的分子依据。展开更多
Coryloideae consists of four genera: Corylus, Ostryopsis, Carpinus, and Ostrya. While both molecular and non-molecular data support the close relationship of Carpinus and Ostrya, the monophyly of the two genera has re...Coryloideae consists of four genera: Corylus, Ostryopsis, Carpinus, and Ostrya. While both molecular and non-molecular data support the close relationship of Carpinus and Ostrya, the monophyly of the two genera has remained controversial. In this study, sequences of the nuclear nitrate reductase (Nia) were used to test the naturalness of the two genera. Ostrya species form a robust clade, supporting the monophyly of the genus. The clade, however, is located between Carpinus cordata and the remaining species of Carpinus, indicating that Carpinus is paraphyletic, and Ostrya has evolved from within Carpinus. Within Carpinus, section Distegocarpus is polyphyletic, whereas section Carpinus is a clade where subsections Polyneurae and Carpinus are more closely related to each other than either is to subsection Monbeigianae.展开更多
文摘在江西婺源的浙江红山茶天然林分里发现少量的白花变异植株,花色在White Group NN155B~C之间。白花变异植株树型、叶型、果型与浙江红山茶原种整体差别不大。为鉴定这类变异植株是新物种亦或是原种变种或变型,本文利用RPB2低拷贝核基因标记开展红山茶组与油茶组主要近缘种的分子甄别。研究结果显示,各山茶属物种的kimur2-parameter平均距离为0.019,与各近缘种比较,浙江红山茶与油茶组的越南油茶、普通油茶有更近的亲缘关系。浙江红山茶原种与白花变异kimur2-parameter距离仅为0.005,远小于各近缘种间距离。系统发育树显示包括白花变异的浙江红山茶不同个体能按同一物种聚成一类与其他物种分离,结果支持白花变异作为浙江红山茶变异类型进行归并。研究将浙江红山茶与其近缘种区分出来,进一步为生产应用中浙江红山茶种真实性甄别提供了可靠的研究方法,同时也为浙江红山茶白花新品种考证提供了重要的分子依据。
文摘Coryloideae consists of four genera: Corylus, Ostryopsis, Carpinus, and Ostrya. While both molecular and non-molecular data support the close relationship of Carpinus and Ostrya, the monophyly of the two genera has remained controversial. In this study, sequences of the nuclear nitrate reductase (Nia) were used to test the naturalness of the two genera. Ostrya species form a robust clade, supporting the monophyly of the genus. The clade, however, is located between Carpinus cordata and the remaining species of Carpinus, indicating that Carpinus is paraphyletic, and Ostrya has evolved from within Carpinus. Within Carpinus, section Distegocarpus is polyphyletic, whereas section Carpinus is a clade where subsections Polyneurae and Carpinus are more closely related to each other than either is to subsection Monbeigianae.