Genome-Wide Association Mapping Identifies Novel Panicle Morphology Loci and Candidate Genes in Sorghum

Wang, L and Upadhyaya, H D and Zheng, J and Liu, Y and Singh, S K and Gowda, C L L and Kumar, Rajendra and Zhu, Y and Wang, T and Li, J (2021) Genome-Wide Association Mapping Identifies Novel Panicle Morphology Loci and Candidate Genes in Sorghum. Plant Science (TSI), 12. pp. 1-9. ISSN 1664-462X

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Abstract

Panicle morphology is an important trait in racial classification and can determine grain yield and other agronomic traits in sorghum. In this study, we performed association mapping of panicle length, panicle width, panicle compactness, and peduncle recurving in the sorghum mini core panel measured in multiple environments with 6,094,317 single nucleotide polymorphism (SNP) markers. We mapped one locus each on chromosomes 7 and 9 to recurving peduncles and eight loci for panicle length, panicle width, and panicle compactness. Because panicle length was positively correlated with panicle width, all loci for panicle length and width were colocalized. Among the eight loci, two each were on chromosomes 1, 2, and 6, and one each on chromosomes 8 and 10. The two loci on chromosome 2, i.e., Pm 2-1 and Pm 2-2, were detected in 7 and 5 out of 11 testing environments, respectively. Pm 2-2 colocalized with panicle compactness. Candidate genes were identified from both loci. The rice Erect Panicle2 (EP2) ortholog was among the candidate genes in Pm 2-2. EP2 regulates panicle erectness and panicle length in rice and encodes a novel plant-specific protein with unknown functions. The results of this study may facilitate the molecular identification of panicle morphology-related genes and the enhancement of yield and adaptation in sorghum.

Item Type:	Article
Divisions:	Genebank
CRP:	UNSPECIFIED
Uncontrolled Keywords:	sorghum, panicle morphology, association mapping, mini core, candidate genes
Subjects:	Mandate crops > Sorghum Others > Genetics and Genomics Others > Gene Bank
Depositing User:	Mr Nagaraju T
Date Deposited:	09 Jun 2025 05:58
Last Modified:	09 Jun 2025 05:58
URI:	http://oar.icrisat.org/id/eprint/13132
Official URL:	https://www.frontiersin.org/journals/plant-science...
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	This study was supported by the National Natural Science Foundation of China (31971993), the Anhui Provincial Natural Science Fund (2008085MC73), the Anhui Provincial Key R&D Programs (202004b11020003), and the Key Project of Natural Science Research of the Anhui Provincial Education Department (KJ2019A0811).
Links:	Google Scholar

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