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作物学报 ›› 2009, Vol. 35 ›› Issue (5): 839-847.doi: 10.3724/SP.J.1006.2009.00839

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

芥菜型油菜黄籽性状的遗传、基因定位和起源探讨

刘显军，袁谋志，官春云，陈社员，刘淑艳，刘忠松   

  1. 湖南农业大学油料作物研究所，湖南长沙410128
  • 收稿日期:2008-10-14 修回日期:2009-01-17 出版日期:2009-05-12 网络出版日期:2009-03-23
  • 通讯作者: 刘忠松
  • 基金资助:

    本研究由国家自然科学基金项目（30471098），国家高新技术研究发展计划（863计划）项目（2006AA10A113）资助。

Inheritance，Mapping and Qrigin of the Yellow-Seeded Traits in Brassica juncea

LIU Xian-Jun，YUAN Mou-Zhi**，GUAN Chun-Yun，CHENille She-Yuan，LIU Shu-Yan，LIU Zhong-Song   

  1. Oilseed Research Institute，Hunan Agricultural University， Changsha 410128，China
  • Received:2008-10-14 Revised:2009-01-17 Published:2009-05-12 Published online:2009-03-23
  • Contact: LIU Zhong-Song

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被引次数

66

摘要：

油菜种皮颜色既是一个形态指示性状, 又与种子休眠和品质有关。以芥菜型油菜种皮颜色分离的2个BC6F2群体为作图群体，用微卫星(SSR)等标记进行连锁定位, 并用定位标记对22份材料进行关联分析, 通过反转录-聚合酶链反应(RT-PCR)分析12份材料种皮中4-二氢黄酮醇还原酶(DFR)、花色素合酶(ANS)和花色素还原酶(ANR)基因的表达, 对6份黄籽材料的种皮颜色基因等位性进行测定, 结果将芥菜型油菜控制种皮颜色的2个基因位点分别定位到A9和B3连锁群, 并找到其两侧紧密连锁标记, 发现黄籽材料种皮颜色基因位点附近0.9 cM和1.5 cM区域高度保守, 所有黑色种皮中DFR、ANS和ANR基因均表达, 所有黄色种皮中DFR和ANS均不表达，但ANR基因表达或不表达，黄籽材料的种皮颜色基因等位。根据这些结果结合前人研究, 认为芥菜型油菜种皮颜色基因是调控基因，黄籽为单一起源。

关键词: 芥菜型油菜, 种皮颜色, 基因定位, 关联分析, 等位性测定, 基因表达

Abstract:

Seed coat color is not only a morphological indicator but also association with dormancy and quality of seed in Braasica. The seeds of Brassica species are divided into such categories as black, brown or yellow according to their coat color. The emphasis has been put on breeding for the yellow-seeded rapeseed in recent years. Most genetic studies showed that seed coat color is controlled by two duplicate loci in Brassica juncea. Chemical analysis and DMACA (p-dimethylaminocinnamaldehyde) staining confirmed that the yellow seed coat does not contain any proanthocyanidins while the black or brown seed coat does. Dihydroflavonol 4-reductase (DFR), anthocyanidin synthase (ANS), and anthocyanidin reductase (ANR) are the key enzymes of flavonoid biosynthetic pathway leading to production of proanthocyanidins. As revealed by RT-PCR, the genes encoding DFR, ANS and ANR are not expressed in the transparent testa of B. juncea yellow seeds. The two BC6F2 populations, derived from crossing and backcrossing the yellow-seeded parent Sichuan yellow to the black-seeded Purple-leaf mustard and comprised 143 or 141 individual plants, were used to map the loci controlling seed coat color in B. juncea by using SSRs and SCARs. The twenty-two B. juncea accessions collected from all over the world were genotyped for association analysis using the markers mapped. The expression of the genes encoding DFR, ANS, and ANR in seed coat at 20 days after pollination was investigated by RT-PCR in the twelve accessions. The allelism test was carried out by a diallel cross for the six yellow-seeded accessions from China, Canada, India or Russia. We mapped the two loci A and B controlling seed coat color on the linkage groups A9 and B3, receptively, and found the 22 linked markers flanking these loci. The closest markers flanking the locus A on A9 were the co-dominant markers SCM08 and Ni4-C09, which are 0.5 and 1.6 cM far from the locus, respectively. Although the marker CB10298 on one side of the locus B on B3 was also a co-dominant SSR marker with 0.8 cM from locus B, on the other side a RAPD marker S1096-700 with 3.3 cM apart. The 0.9 and 1.5 cM-long chromosomal regions around these loci were revealed by association analysis to be conserved in all the yellow-seeded accessions genotyped. The expression of the genes DFR and ANS was not detected by RT-PCR in the yellow-seeded accessions investigated although these genes were found to be expressed in seed coat of all the black-seeded ones. The gene ANR was strongly expressed in all the black-seeded accessions studied, and not or weakly expressed in the yellow-seeded accessions. The F1 plants of the fifteen combinations from diallel crossing of the six yellow-seeded accessions all produced yellow seeds, indicating the loci for seed coat color were allelic to each other in these parents. It is proposed from these results and previous studies that the gene controlling seed coat color is a transcription-factor-coding gene and all the yellow-seeded accessions derive from a single origin in Brassica juncea.

Key words: Brassica Juncea, Seed coat color, Genetic mapping, Association analysis, Allelism, Gene expression


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