Kade Research Ltd.
Abstract
The genetic control of winged seeds in intraspecific and interspecific hybrids of Fagopyrum homotropicum Ohnishi.
Yingjie Wang1, Rachael Scarth2 and Clayton Campbell1
1 Kade Research Ltd. Morden, Manitoba, Canada R6M 1E9. 2 Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
Yingjie Wang, Rachael Scarth and Clayton Campbell. 2002. The genetic control of winged seeds in intraspecific and interspecific hybrids of Fagopyrum homotropicum Ohnishi. Fagopyrum 19: 17-21.
Abstract: The inheritance of winged seeds was studied in intraspecific hybrids of the species F. homotropicum and in interspecific hybrids between F. homotropicum and F. esculentum. Based on the segregation ratios of the F2, F3 and BC1F1 generations, two complementary genes W1 and W2 control winged seed, with winged seed being dominant to non-winged. In F. homotropicum, it is proposed that the genotype of the winged seed type is represented as W1 W1 W2 W2. In the non-winged genotype in F. homotropicum, one locus is fixed as homozygous dominant and the other locus as homozygous recessive W1 W1 w2 w2 or w1 w1 W2 W2 which leads to an inheritance pattern appearing as a single locus. To produce a non-variable non-winged phenotype of F.esculentum, one of the two loci must be fixed as homozygous recessive due to cross-pollination of this species, producing three possible genotypes represented as W1 W1 w2 w2, W1 w1 w2 w2 and w1 w1 w2 w2. These genotypes of F. esculentum would produce the different segregation patterns observed in the interspecific hybrids between F. homotropicum and F. esculentum, leading to either one or two gene inheritance, respectively.
Key words: winged seed, inheritance, F. homotropicum
