在前人研究中,芥菜型黄籽基因被定位到B03连锁群的1.5 c M区域内。本试验利用与B03染色体控制黄籽基因区域紧密连锁的unigene(通过RNA_seq技术获得的芥菜型油菜种皮的非冗余基因)和BESs开发标记,并对芥菜型油菜作图群体亲本紫叶芥BAC文...在前人研究中,芥菜型黄籽基因被定位到B03连锁群的1.5 c M区域内。本试验利用与B03染色体控制黄籽基因区域紧密连锁的unigene(通过RNA_seq技术获得的芥菜型油菜种皮的非冗余基因)和BESs开发标记,并对芥菜型油菜作图群体亲本紫叶芥BAC文库(ZBju H BAC文库)进行筛选,由开发的320对引物共筛到BAC920个,对其中483个BACs进行了末端测序,返回序列860条。构建了6段芥菜型油菜B03染色体黄籽区域BAC重叠群,共计长约3.3 Mb;通过BES blast分析表明,在B03染色体黄籽区域与A03、A09染色体存在高度的重复序列。展开更多
Anthocyanins confer the wide range of colors for plants and also play beneficial health roles as potentially protective factors against heart disease and cancer. Brassica juncea is cultivated as an edible oil resource...Anthocyanins confer the wide range of colors for plants and also play beneficial health roles as potentially protective factors against heart disease and cancer. Brassica juncea is cultivated as an edible oil resource and vegetable crop worldwide, thus elucidating the anthocyanin biosynthetic pathway would be helpful to improve the nutritional quality of Brassica juncea through the breeding and cultivating of high anthocyanin content varieties. Herein, 129 genes in B. juncea were identified as orthologs of 41 anthocyanin biosynthetic genes(ABGs) in Arabidopsis thaliana by comparative genomic analyses. The B. juncea ABGs have expanded by whole genome triplication and subsequent allopolyploidizatoin, but lost mainly during the whole genome triplication between B. rapa/B. nigra and A. thaliana, rather than the allopolyploidization process between B. juncea and B. rapa/B. nigra, leading to different copy numbers retention of A. thaliana homologous genes. Although the overall expansion levels ABGs were similar to the whole genome, more negative regulatory genes were retained in the anthocyanin biosynthesis regulatory system. Transcriptional analysis of B. juncea with different anthocyanin accumulation showed that BjDFR, BjTT19, BjTT8 are significantly up-regulated in plants with purple leaves as compared with green leaves. The overexpression of BjTT8 and these target genes which were involved in late anthocyanin biosynthesis and transport might account for increasing levels of anthocyanin accumulation in purple leaves. Our results could promote the understanding of the genetic mechanism of anthocyanin biosynthesis in B. juncea.展开更多
文摘在前人研究中,芥菜型黄籽基因被定位到B03连锁群的1.5 c M区域内。本试验利用与B03染色体控制黄籽基因区域紧密连锁的unigene(通过RNA_seq技术获得的芥菜型油菜种皮的非冗余基因)和BESs开发标记,并对芥菜型油菜作图群体亲本紫叶芥BAC文库(ZBju H BAC文库)进行筛选,由开发的320对引物共筛到BAC920个,对其中483个BACs进行了末端测序,返回序列860条。构建了6段芥菜型油菜B03染色体黄籽区域BAC重叠群,共计长约3.3 Mb;通过BES blast分析表明,在B03染色体黄籽区域与A03、A09染色体存在高度的重复序列。
基金funded by the National Key Research and Development Program of China(2016YFD0100202)the Natural Science Foundation of Hunan Province,China(2016JJ1010)the Scientific Research Fund of Hunan Provincial Education Department,China(18C0305,17K035,17C0652,and 17C0653)。
文摘Anthocyanins confer the wide range of colors for plants and also play beneficial health roles as potentially protective factors against heart disease and cancer. Brassica juncea is cultivated as an edible oil resource and vegetable crop worldwide, thus elucidating the anthocyanin biosynthetic pathway would be helpful to improve the nutritional quality of Brassica juncea through the breeding and cultivating of high anthocyanin content varieties. Herein, 129 genes in B. juncea were identified as orthologs of 41 anthocyanin biosynthetic genes(ABGs) in Arabidopsis thaliana by comparative genomic analyses. The B. juncea ABGs have expanded by whole genome triplication and subsequent allopolyploidizatoin, but lost mainly during the whole genome triplication between B. rapa/B. nigra and A. thaliana, rather than the allopolyploidization process between B. juncea and B. rapa/B. nigra, leading to different copy numbers retention of A. thaliana homologous genes. Although the overall expansion levels ABGs were similar to the whole genome, more negative regulatory genes were retained in the anthocyanin biosynthesis regulatory system. Transcriptional analysis of B. juncea with different anthocyanin accumulation showed that BjDFR, BjTT19, BjTT8 are significantly up-regulated in plants with purple leaves as compared with green leaves. The overexpression of BjTT8 and these target genes which were involved in late anthocyanin biosynthesis and transport might account for increasing levels of anthocyanin accumulation in purple leaves. Our results could promote the understanding of the genetic mechanism of anthocyanin biosynthesis in B. juncea.
