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This study was conducted to dissect the genetic basis and to explore the candidate genes underlying one of the important genomic regions on an SBI-10 long arm (L), governing the complex stay-green trait contributing to post-flowering drought-tolerance in sorghum. A fine-mapping population was developed from an introgression line cross-RSG04008-6 (stay-green) × J2614-11 (moderately senescent). The fine-mapping population with 1894 F 2 was genotyped with eight SSRs and a set of 152 recombinants was identified, advanced to the F 4 generation, field evaluated with three replications over 2 seasons, and genotyped with the GBS approach. A high-resolution linkage map was developed for SBI-10L using 260 genotyping by sequencing-Single Nucleotide Polymorphism (GBS-SNPs). Using the best linear unpredicted means (BLUPs) of the percent green leaf area (%GL) traits and the GBS-based SNPs, we identified seven quantitative trait loci (QTL) clusters and single gene, mostly involved in drought-tolerance, for each QTL cluster, viz., AP2/ERF transcription factor family ( Sobic.010G202700 ), NBS-LRR protein ( Sobic.010G205600 ), ankyrin-repeat protein ( Sobic.010G205800 ), senescence-associated protein ( Sobic.010G270300 ), WD40 ( Sobic.010G205900 ), CPK1 adapter protein ( Sobic.010G264400 ), LEA2 protein ( Sobic.010G259200 ) and an expressed protein ( Sobic.010G201100 ). The target genomic region was thus delimited from 15 Mb to 8 genes co-localized with QTL clusters, and validated using quantitative real-time (qRT)-PCR.

Fine-Mapping of Sorghum Stay-Green QTL on Chromosome10 Revealed Genes Associated with Delayed Senescence