Qtl mapping of some morphological traits of rice in a RILS population derived from Hashemi and modified Nemat varieties hybrid

Abstract

In this study, QTLs controlling traits related to crop and grain yield were mapped using 140 recombinant inbred lines (F9 and F10) along with 4 control genotypes in anaugment experiment based on a randomized complete block design in 2consecutive years. Population linkage map was consisted of 170 SSR3 / 2132 centimorgan (cM) markers of rice genome, and mean distance between adjacent markers was equal to 12.47 centimorgan (cM). Composite Interval Mapping analysis was done for studying number of days to flowering in the first year, a QTL was identified on chromosome 3 and in the second year, three QTLs were identified on chromosomes 2, 3, and 7, which were common on chromosome 3 in both years. Regarding plant height in the first and second years, a QTL was mapped on chromosome 1, which was similar in both years. In terms of number of tillers in the first year, four QTLs were identified on chromosomes 4 and 12 and in the second year two QTLs were identified on chromosomes 11 and 12, and regarding panicle length in the first year, one QTL was identified on chromosome 6 and in the second year two QTLs were identified on chromosomes 2 and 4, and in terms of flag leaf length in the first year, two QTLs were identified on chromosomes 6 and 7 and in the second year two QTLs were identified on chromosome 7.With respect to flag leaf width in the first year, two QTLs were identified on chromosomes 1and 3, and in the second year, one QTL was identified on chromosome 11, and in relation to Panicle exertion in the first year, three QTLs were identified on chromosomes 1, 2, and 8, and in the second year, two QTLs were identified on chromosomes 1 and 2.In regard to yield in the first year, one QTL was identified on chromosome 2 and in the second year, two QTLs were identified on chromosome 2. Also, clusters of genes were identified by Interval Mapping in the population with respect to different traits on chromosomes 1 (two cases) and 12 (one case).