数字农科院2.0

Heading date gene, dth3 controlled late flowering in O. Glaberrima Steud. by down-regulating Ehd1

文献类型： 外文期刊

作者： Bian, X. F.;Liu, X.;Zhao, Z. G.;Jiang, L.;Gao, H.;Zhang, Y. H.;Zheng, M.;Chen, L. M.;Liu, S. J.;Wan, J. M.;Zhai, H. Q.;Wan, J. M.

作者机构：

关键词： Near-isogenic lines;Days to heading;Flowering regulator;African rice MADS-box

期刊名称： PLANT CELL REPORTS

ISSN： 0721-7714

年卷期： 2011 年 30 卷 12 期

页码：

收录情况： SCI

摘要： Heading date in rice is an important agronomic trait controlled by several genes. In this study, flowering time of variety Dianjingyou 1 (DJY1) was earlier than a near-isogenic line (named NIL) carried chromosome segment from African rice on chromosome 3S, when grown in both long-day (LD) and short-day (SD) conditions. By analyzing a large F(2) population from NIL x DJY1, the locus DTH3 (QTL for days to heading on chromosome 3) controlling early heading date in DJY1 was fine mapped to a 64-kb segment which contained only one annotated gene, a MIKC-type MADS-box protein. We detected a 6-bp deletion and a single base substitution in the C-domain by sequencing DTH3 in DJY1 compared with dth3 in NIL, and overexpression of DTH3 caused early flowering in callus. Quantitative real-time PCR revealed that the transcript level of dth3 in NIL was lower than that DTH3 in DJY1 in both LD and SD conditions. The Early heading date 1 (Ehd1) which promotes the RFT1, was up-regulated by DTH3 in both LD and SD conditions. Based on Indel and dCAPs marker analysis, the dth3 allele was only present in African rice accessions. A phylogenetic analysis based on microsatellite genotyping suggested that African rice had a close genetic relationship to O. rufipogon and O. latifolia, and was similar to japonica cultivars. DTH3 affected flowering time and had no significant effect on the main agronomic traits.

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