Wang Lihua, Upadhyaya Hari D, Zheng Jian, Liu Yanlong, Singh Shailesh Kumar, Gowda C L L, Kumar Rajendra, Zhu Yongqun, Wang Yi-Hong, Li Jieqin
College of Agriculture, Anhui Science and Technology University, Chuzhou, China.
Gene Bank, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheruvu, India.
Front Plant Sci. 2021 Oct 5;12:743838. doi: 10.3389/fpls.2021.743838. eCollection 2021.
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., and , were detected in 7 and 5 out of 11 testing environments, respectively. colocalized with panicle compactness. Candidate genes were identified from both loci. The rice () ortholog was among the candidate genes in . 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.
圆锥花序形态是高粱种族分类中的一个重要性状，并且能够决定高粱的籽粒产量和其他农艺性状。在本研究中，我们利用6,094,317个单核苷酸多态性（SNP）标记，在多个环境下对高粱微型核心种质群体的圆锥花序长度、圆锥花序宽度、圆锥花序紧密度和穗颈弯曲度进行了关联分析。我们在第7和第9号染色体上各定位了一个控制穗颈弯曲度的位点，以及8个控制圆锥花序长度、宽度和紧密度的位点。由于圆锥花序长度与圆锥花序宽度呈正相关，所有控制圆锥花序长度和宽度的位点都共定位。在这8个位点中，第1、2和6号染色体上各有2个，第8和10号染色体上各有1个。位于第2号染色体上的两个位点，即 和 ，分别在11个测试环境中的7个和5个环境中被检测到。 与圆锥花序紧密度共定位。从这两个位点中鉴定出了候选基因。水稻 （）的直系同源基因是 中的候选基因之一。 在水稻中调控穗直立性和穗长，并且编码一种功能未知的新型植物特异性蛋白。本研究结果可能有助于高粱圆锥花序形态相关基因的分子鉴定以及产量和适应性的提高。
