MOLECULAR AND GENETIC ENHANCEMENT OF ABIOTIC STRESS TOLERANCE IN SORGHUM
Location: Plant Stress and Germplasm Development Research
Title: Registration of the IS3620C/BTx623 recombinant inbred mapping population of sorghum (Sorghum bicolor L. [Moench.])
Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: July 30, 2010
Publication Date: January 1, 2011
Citation: Burow, G.B., Klein, R.R., Klein, P.E., Franks, C.D., Burke, J.J., Xin, Z., Pederson, G.A., Schertz, K.F. 2011. Registration of the IS3620C/BTx623 recombinant inbred mapping population of sorghum (Sorghum bicolor L. [Moench.]). Journal of Plant Registrations. 5(1):141-145.
Interpretive Summary: A large mapping population of a crop species consisting of recombinant inbred (RI) line is one of the most important permanent and valuable resources for establishment of molecular roadmap towards full utilization of genome information. Here, we present the culmination of years of dedicated efforts towards development and analysis of the first recombinant inbred mapping population for sorghum from the cross BTx623/IS3620C through its release and registration, making this vital genomic resource available freely for public use through ARS-GRIN (www.ars-grin.gov). We have analyzed, curated, released and registered an expanded mapping population consisting of 430 RI lines from the cross BTx623/IS3620C. This expanded population is unique and contains wealth of molecular and genetic information that represents a valuable resource for the general research community. The release and registration of the expanded BTx623/IS3620C RI mapping population will afford all scientists free access to this valuable genetic material which will facilitate the exploitation of all genomic resources built upon this genetic platform.
The BTx623 x IS3620C sorghum [Sorghum bicolor (L.) Moench.] mapping population (Reg. No. _______, NSL ____, [represented as BTx623/IS3620C]), is a set of 430 F7 to F9 recombinant inbred lines [RILs](USDA-ARS Germplasm Information Network (GRIN) PI 658758 through PI 659060 and PI 659144 through PI 659271) from a cross between inbreds BTx623 (PI 564163) and IS3620C (PI 533839). This sorghum mapping population was released jointly by the Plant Stress and Germplasm Development Unit, Cropping Systems Research Laboratory, USDA-ARS, Lubbock, TX and the Crop Germplasm Research Unit, USDA-ARS, College Station, TX in 2009. The original 137 RILs of this mapping population served as the basis for construction of landmark high density genetic and physical maps (available at www.gramene.org and http://sorgblast3.tamu.edu verified 3/15/2010), with the integrated genome map subsequently used to aid in assembly of the sorghum genome sequence (www.phytozome.net). This population has been genotyped by a number of investigators with a total of 3348 markers including AFLP, DArT, RFLP, SSR, and INDELS that mapped to ten linkage groups corresponding to the ten sorghum chromosomes. The population has been utilized to map quantitative trait loci (QTL) that underlie various agronomic traits including tillering, floral architecture, plant height, flowering date, grain size, and abiotic stress tolerance. The registration of this recombinant inbred mapping population will allow public access to the genomic and germplasm resources that can facilitate mapping and gene discovery for complex traits in sorghum and related cereal species.