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- W2370448087 abstract "China is the origin center of B.campestris L.which is cultivated in a large area and has evolved into several biotypes:spring type,winter type and semi winter type.Spring and winter types are cultivated in the north China while semi winter type is cultivated in the south China.In order to distinguish oil use with vegetable use B.campestris and distinguish different biotypes,spring and winter type cultivated in the north China are named B.campestris var. oleifera while semi winter type cultivated in the south China is named B.chinensis var. oleifera .It is important to study its origin and evolution.Morphological identification and RAPD analysis were carried out on 82 germplasm samples of B.campestris L.originated in different regions of China as well as on the out group germplasm consisting of B.napus,B.juncea,B.alboglabra and B.nigra cy giebra. Based on morphological data,RAPD data and RAPD morphological combined data,genetic distances were calculated by the formula of Sokal and Sneath (1963).Three phylogenetic trees were constructed with MEGA Version 2 1 by UPGMA method in the aim of revealing the evolution and origin of B.campestris L.in China.Average divergence time of spring type,winter type and semi winter type were calculated based on morphological tree,RAPD tree and RAPD morphological tree.It was showed that B.campestris var. oleifera originated earlier than B.chinensis var. oleifera .In B.campestris var. oleifera ,winter type originated earlier than spring type.The germplasm,‘Guanzhongmanjing’,was the oldest among varieties of B.campestris var. oleifera.B.campestris var. oleifera might originate in Shaanxi and evolve into spring type which has been largely cultivated in Gansu and Qinghai etc. B.chinensis var. oleifera might originate in the area of Yunnan,Guizhou,Sichuan and Hubei.This study demonstrated that morphological characters combined with molecular markers can be well employed to study the origin and evolution of B.campestris L." @default.
- W2370448087 created "2016-06-24" @default.
- W2370448087 creator A5022074201 @default.
- W2370448087 date "2003-01-01" @default.
- W2370448087 modified "2023-09-23" @default.
- W2370448087 title "Origins and Evolution of Brassica campestris L.in China" @default.
- W2370448087 hasPublicationYear "2003" @default.
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