Effect of homoeologous pairing ph 1-locus of Triticum aestivum L. on its F-1 - Bridge hybrids with the species (2x, 4x, 6x) Triticum L., (2x, 4x) Aegilops L., and (2x, 4x) Lolium L. genera

Pilch, J.

Plant Breeding and Seed Science 54: 53-63

2006


Accession: 015607905

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Abstract
Mono-5B Chinese Spring, mono-5B Jara, mono -5B Favorit exhibiting the deficiency of 5B-chromosome, the mutant -Ph Chinese Spring (ph 1b, ph 1b), mono-5A Chinese Spring, mopno-5D Chinese Spring with the genotype Ph 1, Ph 1 and the varieties Chinese Spring, Jara, Favorit with the genotype Ph 1 Ph 1 were used in the crosses with 7 species of Triticum, 5 species of Aegilops and one species of Lolium genera to investigate the effect of the Ph1 - locus on F I - bridge hybrids. Altogether, 117 cross-combinations were made and 98 259 florets were pollinated. The effectiveness of the locus Ph 1 was judged by the percentage of seed set of F-1-bridge hybrids. Wide variation of seed set was observed in F-1-bridge hybrids for all cross-combinations made. The deficiency of 5B chromosome exhibited higher effectiveness (10.7% - 4.2%) than the recessive gene ph1b (3.2%). Out of the monosomics of 5B-chromosome, mono-5B Chinese Spring exhibited the stronger effectiveness on seed set of F - bridge hybrids (10.7%) probably due to the presence of the recessive crossability genes. Among the sources of the genotype Ph1 Ph 1, mono-5A, -5D of the variety Chinese Spring showed higher percentage of seed set (2.4% and 1.9%), respectively than the disomic varieties Chinese Spring, Jara and Favorit (0.8%, 0.4% and 0.4%, respectively. Of the related species, three genotypes were identified as highly effective: T nionococcum L., T. dicoccoides Korn., and Ae. speltoides Taush. for obtaining, the high fertile F-1-bridge hybrids and complementary to the deficiency of 5B-chromosome and the recessive gene ph 1b.