Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo, 183-8509, Japan.
Food Resources Education and Research Center, Graduate School of Agricultural Science, Kobe University, 1348 Uzurano-cho, Kasai, Kobe, 675-2103, Japan.
Sci Rep. 2020 Nov 16;10(1):19855. doi: 10.1038/s41598-020-76949-8.
Lodging can reduce grain yield and quality in cereal crops including rice (Oryza sativa L.). To achieve both high biomass production and lodging resistance, the breeding of new cultivars with strong culms is a promising strategy. However, little is known about the diversity of culm strength in temperate japonica rice and underlying genetic factors. Here, we report a wide variation of culm strength among 135 temperate japonica cultivars, and some landraces having the strongest culms among these cultivars. The genome-wide association study (GWAS) identified 55 quantitative trait loci for culm strength and morphological traits, and revealed several candidate genes. The superior allele of candidate gene for culm thickness, OsRLCK191, was found in many landraces but had not inherited to the modern improved cultivars. Our results suggest that landraces of temperate japonica rice have unutilized superior alleles for contributing future improvements of culm strength and lodging resistance.
lodging 会降低包括水稻（Oryza sativa L.）在内的谷类作物的产量和品质。为了实现高生物量生产和抗倒伏，培育具有强壮茎秆的新品种是一种很有前途的策略。然而，人们对温带粳稻茎秆强度的多样性及其潜在的遗传因素知之甚少。在这里，我们报告了 135 个温带粳稻品种之间茎秆强度的广泛差异，以及这些品种中一些具有最强茎秆的地方品种。全基因组关联研究（GWAS）鉴定出 55 个与茎秆强度和形态特征相关的数量性状位点，并揭示了几个候选基因。候选基因 OsRLCK191 与茎粗有关，其优异等位基因存在于许多地方品种中，但没有遗传到现代改良品种中。我们的研究结果表明，温带粳稻地方品种具有未被利用的优异等位基因，可以为未来提高茎秆强度和抗倒伏能力做出贡献。
