Registration of a Hard Red Winter Wheat Genetic Stock Homozygous for ph1b for Facilitating Alien Introgression for Crop Improvement

Abstract

Wild relatives of common wheat (Triticum aestivum L.) are important sources of disease and pest resistance that can be exploited in wheat improvement. However, in wheat-alien species hybrids the pairing homeologous gene, Ph1, suppresses the pairing and recombination of wheat and alien chromosomes and no alien genetic transfer can occur. However, in plants nullisomic for the Ph1 gene, and in ph1b mutant stocks, having a large deletion at the Ph1 locus, homeologous wheat and alien chromosomes can pair and recombine. The original ph1b mutant stock is in Chinese Spring background, which has poor agronomic characteristics, and several backcrosses with adapted wheat cultivars are necessary before the agronomic performance of recombinants can be evaluated. The present report describes the transfer and characterization of the ph1b mutant allele into an adapted Kansas winter wheat, which was released as KS12WGGRC55 (TA5092) (Reg. No. GS-170, PI 663870), which will accelerate the evaluation and utilization of wheat alien recombinants in cultivar improvement.

Introgressiomics: a new approach for using crop wild relatives in breeding for adaptation to climate change

“…In other cases, recombination in the hybrids between chromosomes of the cultivated species and the CWR is supressed or reduced, which makes introgression more difficult (Bedő and Láng, 2015). In this way, in wheat the gene Ph1 suppresses pairing and recombination of wheat and alien chromosomes; however, in plants that are nullisomic for the Ph1 gene, or in ph1b mutant stocks, homoelogous wheat and alien chromosomes can pair and recombine, which facilitates introgression from CWR in the cultivated wheat (Friebe et al, 2012).…”

Genetics and Genomics of Cultivated Eggplants and Wild Relatives

“…In this way, in wheat the gene Ph1 suppresses pairing and recombination of wheat and alien chromosomes; however, in plants that are nullisomic for the Ph1 gene, or in ph1b mutant stocks, homoelogous wheat and alien chromosomes can pair and recombine, which facilitates introgression from CWR in the cultivated wheat (Friebe et al, 2012).…”