Identification of segregation-distortion-neutral alleles to improve pollen fertility of indica-japonica hybrids in rice (Oryza sativa L.) |
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Authors: | CG Lu K Takabatake H Ikehashi |
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Institution: | (1) Research and Development Institute, Rajamangala Institute of Technology, 399 SiSao Tewes Wachira, Dusit, Bangkok, 10300, Thailand;(2) Department of Plant Sciences, The University of Adelaide, Waite Campus, PMB 1, Glen Osmond, SA 5064, Australia;(3) Plant Breeding Institute, The University of Sydney, Woolley Bldg A20, NSW, 2006, Australia |
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Abstract: | The genetics of resistance to Ascochyta blight (Ascochyta fabae f. sp. fabae) was studied in two populations of faba bean (Vicia faba). Plants of a resistant population, ILB 752, and a susceptible one, NEB 463, were screened for their reaction to the pathogen
and the results were quantified on a scale of 0–5. Crosses were made between plants both within and between accessions and
the F1 and F2 generations assessed in a field trial 21 and 45 days after inoculation. Disease scores were greater at 45 days than at 21
days and they were not significantly affected by the presence of susceptible spreader rows in part of the trial. ILB 752 carried
a major dominant gene conferring resistance while NEB 463 carried the recessive allele for susceptibility. Furthermore, a
minority of plants of NEB 463 appeared to carry at least one pair of complementary recessive genes, also conferring resistance.
Most of the plants of ILB 752 were homozygous for the dominant resistance gene and a few were heterozygous. Reciprocal crosses
behaved identically, indicating the absence of maternal effects in the expression of Ascochyta blight resistance in faba beans.
The results show that it is important to confirm the level of heterozygosity for the resistance genes in this partially outbreeding
species before crossing is commenced. The major dominant gene for resistance, identified in ILB 752, has clear potential for
use in breeding for Ascochyta blight resistance. The minor genes identified in NEB 463 also show the potential for accumulating
resistance through mass selection.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Ascochyta blight Ascochyta fabae disease resistance faba bean genetic variation Vicia faba |
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