Registration of the OS9XQ36 Mapping Population of Wheat (Triticum aestivum L.)

Abstract

The OS9XQ36 wheat (Triticum aestivum L.) mapping population (Reg. No. MP‐2, NSL 465170) is a set of 164 F6–derived recombinant inbred lines (USDA–ARS Germplasm Resources Information Network [GRIN] accession no. through ) from the cross between OS9A (PI 658243), a single plant selection from the cultivar Stephens (CI 17596), and QCB36 (PI 658244), a single plant selection from the elite breeding line OR9900553. This population was developed to investigate the consistently lower grain hardness and superior end‐use quality of OR9900553 compared with Stephens. This population has also been genotyped with diversity array technology (DArT) and simple sequence repeat (SSR) markers resulting in the construction of a 270‐marker linkage map covering 1785 cM at a density of one marker per 7 cM. This F6–derived population is one of 20 mapping populations being used by the WheatCAP consortium (http://maswheat.ucdavis.edu/) for extensive quantitative trait locus analysis and forms part of a publicly available long‐term genetic resource to map complex traits in wheat.

Identification of genetic factors controlling kernel hardness and related traits in a recombinant inbred population derived from a soft × ‘extra-soft’ wheat (Triticum aestivum L.) cross

“…tritici Ericks) (Chen and Line, 1995). QCB36 is a single plant selection from the elite breeding line OR9900553, a high-yielding and facultative semi-dwarf white wheat breeding line, with 'extra-soft' grain kernel texture and superior end-use quality also known to carry the 2N v S-2AS.2AL, 5B:7B, and 1BL.1RS chromosome translocations (Riera-Lizarazu et al 2010). The parents contributed contrasting alleles of two gibberellic acid (GA)-insensitive, semi-dwarfing genes, Rht-B1 and Rht-D1.…”

“…Genotyping, linkage mapping, and QTL analysis The two parents and 164 RILs were genotyped with simple sequence repeat (SSR) and diversity array technology (DArT) markers as described by Riera-Lizarazu et al (2010). In addition, all RILs were genotyped with markers specific for semi-dwarfing alleles at the Rht-B1 and Rht-D1 loci and the vernalization response gene Vrn-B1.…”

Notification of the Release of Annual Ryegrass Genetic Stock IL1

“…Research utilizing homozygous tall fescue DHs to study the inheritance and expression of quantitative traits suggests that selection within homozygous lines could be used for the improvement of tall fescue (Henson and Buckner, 1957; Buckner and Fergus, 1960), because particular alleles governing the quantitative trait loci are fixed, providing a stable and predictable set of characters for breeding improvements. Additional research suggests that homozygous lines are useful in genetic mapping studies focused on the elucidation of a variety of complex genetic traits (Riera‐Lizarazu et al, 2010).…”

Registration of Annual Ryegrass Genetic Stock IL2

“…Research utilizing homozygous tall fescue lines to study the inheritance of palatability suggests that selection within homozygous lines could be used for the improvement of tall fescue (Henson and Buckner, 1957; Buckner and Fergus, 1960). Additional research also indicates that genetic mapping studies focused on the elucidation of a variety of complex genetic traits can be more readily accomplished through the use of homozygous lines (Riera‐Lizarazu et al, 2010). IL2's primary utility is as a genetic stock for the inducement of genome or chromosome loss when used as the maternal parent in the generation of interspecific hybrids with Lolium arundinaceum The release of IL2 provides an alternative to the use of microspore culture for the development of dihaploid lines and could be a potential method for generating improved Lolium cultivars.…”