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GrainGenes Reference Report: HER-86-167

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Reference	HER-86-167
Title	Androgenesis from Festuca pratensis x Lolium multiflorum amphidiploid cultivars in order to select and stabilize rare gene combinations for grass breeding
Journal	Heredity
Year	2001
Volume	86
Pages	167-176
Author	Lesniewska A [ Show all 8 ]
Abstract	Summary: Androgenesis using amphidiploid cultivars of Festuca pratensis x Lolium multiflorum as parents, overcame earlier problems that gave rise to widespread plant sterility amongst androgenic Festulolium populations. Two Festuca pratensis x Lolium multiflorum (2n = 4x = 28) cultivars, Sulino and Felopa, were highly amenable to androgenesis and 10% of plants, including some novel androgenic genotypes, had sufficient fertility to produce progeny and further generations. The genomes of amphidiploid cultivars, which represent the F8 generation, were the result of considerable intergeneric chromosome recombination. Moreover, during cultivar development, natural and breeders' selection pressures had led to the assembly of gene combinations that conferred good growth characters and fertility with the removal of putative deleterious gene combinations. Over 80% of the androgenic plants derived from the amphidiploid F. pratensis x L. multiflorum (2n = 4x = 28) had 14 chromosomes and were likely to be dihaploids with a single genome of Lolium and of Festuca. In contrast, hybrids of F. pratensis x L. multiflorum (2n = 2x = 14) found naturally are invariably sterile. Structural reorganization within the genomes of the androgenic Festulolium plants had restored fertility in genotypes expected to contain the haploid genome of Lolium and Festuca. This provided opportunities for their future incorporation in breeding programmes and the development of fertile diploid Lolium-Festuca hybrids. Amongst the androgenic plants, Festulolium genotypes were recovered that conferred excellent drought resistance or freezing tolerance and were thought to be highly suitable for entry into plant breeding programmes
Keyword	[ Hide all but 1 of 47 ] androgenesis anther culture breeding breeding programme chromosome chromosome number cold tolerance cultivar cultivar development dihaploid diploid dna hybridization drought drought resistance entry fertile fertility festuca festuca pratensis freezing freezing tolerance gene generation genome genotype growth haploid hybrid incorporation infertility intergeneric hybridization lolium lolium multiflorum multiflorum order plant breeding population pratensis progeny rare recombination removal resistance selection selection pressure sterility tolerance

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