Project Number: 3096-21000-020-02
Start Date: Apr 01, 2011
End Date: Dec 31, 2012
An evaluation of cold tolerance responses across four locations within the U.S. grain sorghum belt will be performed in this study. Analysis using Quantitative trait loci (QTL) mapping of the BTx623 x PI567946 RIL population multi-location data will be performed to identify genome regions associated with enhanced early season cold tolerance. Determination of effective means of hybrid development for grain sorghum will be conducted through the analysis of F1 hybrids between three sterile versions of Chinese sources of cold tolerance and three elite US A/B lines. Additional new sets of germplasm from China (Stillwater investigator's accessions), the highlands of Sudan (and Ethiopia), and novel mutant lines of BTx 623 will be characterized for their cold tolerance at early stages and at grain filling stages. Detailed study of cold-tolerant lines will be conducted by characterizing disease reactions of sorghum to various seedling pathogens and through studies of linkage drag with other traits such as the association of cold tolerance with colored testa. At the end of various studies, all data will be assembled and analyzed statistically to (1) identify new germplasm of sorghums (eg; landraces and mutant lines) that can be used sources of cold tolerance for various applications, (2) gather genetic data on inheritance of cold tolerance in hybrids and the relative contribution of maternal effects to serve as guide in variety development; and (3) pinpoint DNA marker and phenotypic information that can applied for development of cold tolerant sorghum germplasm.