Soil B deficiency always causes the decrease of the rapeseed (Brassica napus L) yield and quality. Genetic variation exists for B-efficiency among different Brassica napus germplasms. Field experiments were conducte...
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Soil B deficiency always causes the decrease of the rapeseed (Brassica napus L) yield and quality. Genetic variation exists for B-efficiency among different Brassica napus germplasms. Field experiments were conducted to study the genetic control of boron efficiency in oil seed rape by boron efficient coefficient (BEC, ratio of the seed yield at the critical boron level to that at the boron sufficient level) with 657 F lines, which was derived from a cross between a high B-efficiency cultivar, 'Qingyou 10' and a low B-efficiency cultivar, 'Bakow'. Results showed that the parents showed significant differences in both seed yield under boron deficiency treatment and BEC. The distribution of the seed yield of the 657 F lines showed normal distribution (mean=81.88g;SD=20.56) under supplied sufficient boron. Boron deficiency decreased the seed yield of Brassica napus significantly and the distribution of BECs of the F lines showed a bimodal distribution. The 657 F lines were grouped into high boron efficiency lines and low boron efficiency lines depended on the bimodal distribution of BECs. The ratio of high boron efficiency to low boron efficiency lines fitted the expected ratio of 3:1, indicating that one major gene controlled the B-efficiency trait, which further confirmed the results we obtained from a F population with 183 individuals (Xu, 2001). 127 F lines selected randomly in the population, whose distributions of the BEC and seed yield under 2 treatments were similar to the population, could be used to narrow down the target region for fine-mapping the high boron efficiency gene. Abbreviation: B - boron;HWSB - hot water soluble boron;BEC - boron efficiency coefficient;*** - Brassica napus L.
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