QTLs mapping for agronomic traits in RIL of japonica cultivar x japonica weedy rice.

摘要

A population of recombinant inbred lines derived from a cross between Ilpumbyeo, a blast-susceptible japonica cultivar of high eating-quality and high yield potential, and GL33, a blast-resistance japonica weedy rice was used to identify quantitative trait loci (QTLs) affecting important agronomic traits in rice. A total of 14 putative QTLs were identified, 9 of which were from the Ilpumbyeo alleles, and 5 from the GL33 alleles. The percentage of phenotypic variance accounted for by each QTL ranged from 6.4 to 30.2%, with an average of 12.5%. Of 3 QTLs detected for number of days to heading, qhd3 and qhd7 from GL33 functioned to shorten the days to heading time. Three QTLs, qsnpp7 for spikelet number per panicle, qpgr6 for percentage of grain ripening and qyi11 for yield have not been detected in the previous QTLs studies. The QTL qcl1 for culm length accounted for 23.6% of the phenotypic variation on chromosome 1 at the sd-1 region of the gene. Some QTLs, especially for yield component traits on chromosome 1, 3, 6 and 7 were clustered together forming QTL blocks. These QTL blocks seemed useful for marker-assisted selection in japonica rice breeding programme..