多组学框架揭示草莓风味基因及其调控元件。
A multi-omics framework reveals strawberry flavor genes and their regulatory elements.
机构信息
Horticultural Sciences Department, University of Florida, IFAS Gulf Coast Research and Education Center, Wimauma, FL, 33597, USA.
Horticultural Sciences Department, University of Florida, Gainesville, FL, 32611, USA.
出版信息
New Phytol. 2022 Nov;236(3):1089-1107. doi: 10.1111/nph.18416. Epub 2022 Aug 20.
Flavor is essential to consumer preference of foods and is an increasing focus of plant breeding programs. In fruit crops, identifying genes underlying volatile organic compounds has great promise to accelerate flavor improvement, but polyploidy and heterozygosity in many species have slowed progress. Here we use octoploid cultivated strawberry to demonstrate how genomic heterozygosity, transcriptomic intricacy and fruit metabolomic diversity can be treated as strengths and leveraged to uncover fruit flavor genes and their regulatory elements. Multi-omics datasets were generated including an expression quantitative trait loci map with 196 diverse breeding lines, haplotype-phased genomes of a highly-flavored breeding selection, a genome-wide structural variant map using five haplotypes, and volatile genome-wide association study (GWAS) with > 300 individuals. Overlaying regulatory elements, structural variants and GWAS-linked allele-specific expression of numerous genes to variation in volatile compounds important to flavor. In one example, the functional role of anthranilate synthase alpha subunit 1 in methyl anthranilate biosynthesis was supported via fruit transient gene expression assays. These results demonstrate a framework for flavor gene discovery in fruit crops and a pathway to molecular breeding of cultivars with complex and desirable flavor.
风味是消费者对食品偏好的关键因素,也是植物育种计划日益关注的焦点。在水果作物中,确定影响挥发性有机化合物的基因有很大的潜力来加速风味的改善,但许多物种的多倍体和杂合性减缓了这一进程。在这里,我们利用八倍体栽培草莓来说明基因组杂合性、转录组复杂性和果实代谢组多样性如何被视为优势,并利用这些优势来揭示果实风味基因及其调控元件。生成了多组学数据集,包括一个包含 196 个不同育种系的表达数量性状位点图谱、一个高度风味的育种选择的单倍型相位基因组、一个使用五个单倍型的全基因组结构变异图谱,以及一个超过 300 个个体的挥发性全基因组关联研究 (GWAS)。将调控元件、结构变异和与 GWAS 相关的等位基因特异性表达与对风味很重要的挥发性化合物的变异进行叠加。在一个例子中,通过果实瞬时基因表达测定,支持了色氨酸合酶α亚基 1 在甲基色氨酸生物合成中的功能作用。这些结果展示了在水果作物中发现风味基因的框架,以及为具有复杂和理想风味的品种进行分子育种的途径。
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