Research Article

Identification and Genetic Characterization of a New d10 Mutated Indica Rice Germplasm  

Liangrong Jiang1 , Bin Xu1 , Rongyu Huang1 , Fangyu Chen1 , Kangmei Dong1 , Yumin Huang1 , Houcong Wang1 , Yi Tao1 , Jingsheng Zheng1 , Xuanjun Fang2,3
1. School of Life Sciences, Xiamen University, Xiamen 361005, China
2. Institute of Life Sciences, Jiyang College of Zhejiang A&F University, Zhuji, 311800, China
3. Hainan Institute of Tropical Agricultural Resources, Sanya, 572025, China
Author    Correspondence author
Plant Gene and Trait, 2015, Vol. 6, No. 6   doi: 10.5376/pgt.2015.06.0006
Received: 27 Nov., 2015    Accepted: 02 Dec., 2015    Published: 05 Dec., 2015
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This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Preferred citation for this article:

Jiang L.R.., Xu B., Huang R.Y., Chen F.Y., Dong K.M., Huang Y.M., Wang H.C., Tao Y., Zheng J.S., Fang X.J., 2015, Identification and Genetic Characterization of a New d10 Mutated Indica Rice Germplasm, Plant Gene and Trait, Vol.6, No.6 1-12 (doi: 10.5376/pgt.2015.06.0006)

 
Abstract

Plant architecture is a determining factor for yield of cereal crop rice. Multi-tiller and dwarf mutants are useful germplasms for the study of rice plant architecture. In this research, we investigated a new multi-tiller and dwarf mutant, Jiahecong’ai (JHCA), and compared its genetic characteristics with 6 other rice varieties or lines. Two F2 populations were developed by crossing JHCA with Gaoliangdao 1 (GLD1) and Guangchang 13 (GC13), which were used for further studies. Our results showed that the extreme dwarf and multitiller phenotype of JHCA was controlled by a recessive locus named xmd(t). The xmd(t) locus was fine mapped to an interval between XMd-SSR4 and XMd-SSR25 marker on chromosome 2, which spans 190 kb in length including 28 annotated genes. Allelic sequence analysis revealed that the xmd(t) of JHCA has a 40-bp deletion in D10 gene, which encodes a carotenoid cleavage dioxygenase 8 (OsCCD8) involved in strigolactone (SL) biosynthesis pathway. Further genetic analysis suggested that JHCA should be a good rice germplasm for studying plant architecture in rice as well as metabolism interactions between gibberellin and strigolactone based on the reinforcement of dwarfing effect by d10 and sd1.

Keywords
Rice (Oryza sativa L.); multi-tiller; dwarf culm; d10 gene; plant architecture
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