[Genetic dissection of cooked rice elongation in rice (Oryza sativa L.)]

QTLs for milled rice length (MRL), cooked rice length (CRL) and cooked rice elongation (CRE) were identified by using a population of 127 DH lines derived from a cross between ZYQ8 and JX17. Totally, 14 QTLs for rice elongation traits were detected on chromosomes 1, 2, 3, 5, 6, 7, 10, 11 and 12. Two putative QTLs for MRL were mapped on chromosomes 2. Seven putative QTLs for CRL were mapped on chromosomes 1, 6, 7, 10, 11 and 12. Five putative QTLs for CRE were mapped on chromosomes 5, 6, and 10. The regions of G249-G164 on chromosome 3, G30-RZ516 on chromosome 6 and G1082-GA223 on chromosome 10 were detected simultaneously for affecting cooked rice length and cooke rice elongation. LODs of the QTLs related to rice elongation varied from 2.26 to 9.25, and their explained variations from 5.31% to 17.21% . It is indicated that cooked rice elongation was controlled by polygene and Wx-gene located on the same region with qCRE-6 was important to cooked rice elongation.