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ARS Home » Plains Area » Lubbock, Texas » Cropping Systems Research Laboratory » Plant Stress and Germplasm Development Research » Research » Publications at this Location » Publication #398132
Research Project: Discovery and Improvement of Traits to Enhance Sorghum as a Multiple Purpose Crop

Location: Plant Stress and Germplasm Development Research

Title: Registration of sorghum nested association mapping population in BTx623 background as pre-breeding germplasm for early season cold tolerance

Author
item Burow, Gloria
item CHOPRA, RATAN - University Of Minnesota
item Hughes, Halee
item Hayes, Chad
item Xin, Zhanguo
item BURKE, JOHN - US Department Of Agriculture (USDA)
item MORRIS, GEOFF - Colorado State University
item MARLA, SANDEEP - Kansas State University

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/5/2024
Publication Date: N/A
Citation: N/A

Interpretive Summary: The capture of stable genetic variation in the form of inbred lines is a crucial step for development of easy-to-use plant germplasm resources. Recombinant inbred lines are important tools for overall agronomic, genetic analyses and pre-breeding applications. In this report, 771 recombinant inbred lines of sorghum were aggregated from populations developed from three Chinese sorghums (HongKeZi, NiuShengZui and Kaoliang), and a common parent, BTx623, to gather much needed trait and genetic data for early season cold tolerance. This aggregate of lines is referred to as ARS_BTX623 nested association mapping resource for early season cold tolerance. This genetic resource is highly significant in transferring genetic variation and genotype information from Chinese landraces into practical germplasm lines that can be used as pre-breeding resources. This registration will facilitate public access and wider application of sorghum nested association mapping germplasm for use as pre-breeding resource, especially for early season cold tolerance traits of sorghum.

Technical Abstract: The sorghum (Sorghum bicolor (L.) Moench) nested association mapping population (ARS_BTx623NAM_ESCT; PI 676305 MAP), is a germplasm resource for genetic improvement of early season cold tolerance developed and released by USDA, ARS, Lubbock, TX. The sorghum NAM_ESCT population is composed of 771 recombinant inbred lines (F6-F7 advanced generation) derived from inbred line BTx623 crossed separately to cold tolerant HongKeZi (PI 567946), Niu Sheng Zui (PI568016) and Kaoliang (PI562744). The ARS_BTx623NAM_ESCT was employed as genetic resource for dissection of quantitative trait loci and DNA markers that are useful for improvement of sorghum chilling tolerance. Notably, BTx623NAM_ESCT includes new sorghum germplasm that displayed transgressive segregation compared to founders for enhanced chilling tolerance based on germinability, field emergence and seedling vigor, traits that are needed for early season cold tolerance in production setting. The populations has proven to be useful in validating QTL and for chilling tolerance and served as resource for identification of DNA markers for chilling tolerance that are now being applied for further studies. The current NAM population in the BTx623 background is an enduring approach towards capturing genetic variation and genotype information from Chinese landrace germplasm to introduce, create variation and recombine genes for early season cold tolerance into a usable pre-breeding germplasm resource for downstream improvement of sorghum early season cold tolerance.