Gu, Xing-You and Foley, M.E. (2007) Epistatic interactions of three loci regulate flowering time under short and long daylengths in a backcross population of rice. Theoretical and Applied Genetics, 114 (4). pp. 745-754.
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Abstract
The short-day plant rice varies greatly in photoperiod sensitivity (PS) for flowering. The hybrid F1 from a cross between the day-neutral pure line EM93-1 and the weedy rice accession SS18-2 had stronger PS than SS18-2. Some BC1 (EM93-1/F1) segregates were even more sensitive to photoperiod than the F1, as indicated by later flowering or no flowering after 250 days under a 14-h long daylength. A genome-wide scan identified the quantitative trait loci Se7.1, Se7.2 and Se8 for PS from the BC1 population, with all alleles that inhibit flowering derived from SS18-2. These three loci regulate the time of flowering under long daylength through their main effects, and di- and trigenic epistases. Under a 10-h short daylength, the regulation is through Se7.1 and Se8 main effects and digenic epistases involving all three loci. The short daylength not only nullified the main effect of Se7.2, but also changed its epistatic effects from inhibiting flowering under long daylength to promoting flowering. The epistases indicate that genes underlying the three PS loci work in the same pathway for the control of flowering. Many non-flowered BC1s were the trigenic heterozygote; this suggests that the three PS loci are also involved in genetic control of critical daylength.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Plant Science Department, South Dakota State University, Brookings, SD 57007, USA |
| Subjects: | Crop Improvement > Genetics/Genomics Crop Improvement > Plant Breeding |
| Divisions: | Other Crops |
| Depositing User: | Sandhya Gir |
| Date Deposited: | 19 Oct 2010 03:45 |
| Last Modified: | 19 Oct 2010 03:45 |
| Official URL: | http://dx.doi.org/10.1007/s00122-006-0475-z |
| URI: | http://eprints.icrisat.ac.in/id/eprint/137 |
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