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Identification and Gene Mapping of Completely Dominant Earliness in Rice |
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| Authors: | DENG Xiao-jian ZHOU Kai-da LI Ren-duan CHUN Ze LI Ping WANG Wen-Ming ZHAI Wen-Xue ZHU Li-Huang |
| Institution: | 1. Rice Research Institute, Sichuan Agricultural University, Wenjiang 611130;Institute of Genetics, Chinese Academy of Sciences, Beijing 100101 2. Rice Research Institute, Sichuan Agricultural University, Wenjiang 611130 3. Institute of Genetics, Chinese Academy of Sciences, Beijing 100101 |
| Abstract: | The completely dominant earliness was identified in a genic male-sterile and early maturing indica line 6442S-7. F1 progenies from 6442S-7 crossed with thirteen various types of medium- or latematuring varieties, shared the same heading date as 6442S-7. The segregation of heading date in the F2 and B1F1 populations showed that the earliness of 6442S-7 is mainly controlled by two dominant major genes. The local linkage map of one dominant earliness gene harbored in 6442S-7 was constructed with F2 population and four kinds of molecular marker techniques. The results showed that the gene was located between a RFLPmarker C515 and a RAPD marker OPI 11. 557 on the terminal region of short arm of rice chromosome 3,10.9cM and 1.5 cM from C515 and OPI11. 557, respectively. The genetic distances from the target gene to twoSSR markers, RM22 and RM231, and one AFLP marker, PT671, were 3.0, 6.7 and 12.4 cM, respectively. This gene, being identified and mapped first, is designated tentatively as Ef-cd (t). As a new genetic resource of completely dominant earliness, 6442S-7 has splendid future in rice improvement. |
| Keywords: | Oryza sativa L Growth duration Earliness Dominant earliness gene Gene mapping |
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