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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2021, Vol. 43 ›› Issue (6): 971-981.doi: 10.19802/j.issn.1007-9084.2020288

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Phenotypic diversity analysis of new rapeseed germplasm materials derived from interspecific hybridization between Brassica juncea × B. napus

Feng-ping SONG1(), Jia-qing CHENG1, Zhen-xing LIU2, Zhi-qiang CHENG1, Tian-tian CHENG1, Zu-qing MENG1()   

  1. 1.Tibet Agriculture and Animal Husbandry College,Linzhi 860000, China
    2.Sichuan Academy of Agricultural Sciences, Chengdu 610066, China
  • Received:2020-09-29 Online:2021-12-22 Published:2021-12-23
  • Contact: Zu-qing MENG E-mail:songfengping99@126.com;mengzuqing@126.com

Abstract:

In order to broaden the genetic background of Brassica napus, 54 new lines of B. napus were created by interspecific hybridization between B. juncea and B. napus, and their phenotypic diversity was analyzed. The results showed that, (1) the variation coefficient of 22 quantitative traits ranged from 1.64 to 2.04. The genetic diversity index of 22 morphological traits ranged from 0 to 1.86. Among them, the diversity level of silique length, siliques per plant, seeds weight per plant, growth duration, branch height, protein content and oil content were higher than those of other B. napus reported at home and abroad, which indicated that interspecific hybridization between B. juncea and B. napus could create rich genetic variation and broaden the genetic background of B. napus. (2) Principal component analysis transformed 44 phenotypic traits into 10 comprehensive indexes. The yield and quality related traits such as silique number of the main inflorescence, siliques per plant, seeds per silique, erucic acid , linoleic acid, oleic acid, protein, oil content and other yield and quality related traits were the main indicators reflecting the phenotypic characteristics of new type B. napus. The target line might be obtained by selecting. (3) Affected by the directional breeding of B. napus, the materials tested in this experiment have the phenotypic characteristics biased to B. napus. Cluster analysis integrated 44 phenotypic characteristics, and divided 54 lines into 3 groups, of which 29 lines and parents of B. napus were clustered into one group, representing the parent group of B. napus. The 18 lines were clustered into one group, which was far away from the parent of B. napus group, having less advantage in vegetative growth, and poor comprehensive characteristics with low yield. The 7 lines were clustered into the same group, which was close to B. napus parent, having strong nutritional growth advantage with high yield. For the 7 lines had excellent comprehensive characteristics, they might be used as further breeding objects in this area.

Key words: new rapeseed germplasm, phenotypic diversity, principal component analysis, cluster analysis

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