R2R3-MYB transcription factors, StmiR858 and sucrose mediate potato flavonol biosynthesis  

作　　者：Sen Lin Rajesh K.Singh Moehninsi Duroy A.Navarre 

机构地区：[1]Irrigated Agriculture Research and Extension Center,Washington State University,Prosser,WA,USA [2]USDA-Agricultural Research Service,Prosser,WA,USA [3]Present address:Department of Biotechnology,CSIR-Institute of Himalayan Bioresource Technology,Palampur,Himachal Pradesh 176061,India

出　　处：《Horticulture Research》2021年第1期378-390,共13页园艺研究（英文）

基　　金：the Northwest Potato Research Consortium,and funding from the USDA-Agricultural Research Service 2092-21220-001-00D.

摘　　要：Flavonols and other phenylpropanoids protect plants from biotic and abiotic stress and are dietarily desirable because of their health-promoting properties.The ability to develop new potatoes(Solanum tuberosum)with optimal types and amounts of phenylpropanoids is limited by lack of knowledge about the regulatory mechanisms.Exogenous sucrose increased flavonols,whereas overexpression of the MYB StAN1 induced sucrolytic gene expression.Heterologous StAN1 protein bound promoter fragments from sucrolytic genes(SUSY1 and INV1).Two additional MYBs and one microRNA were identified that regulated potato flavonols.Overexpression analysis showed MYB12A and C increased amounts of flavonols and other phenylpropanoids.Endogenous flavonol amounts in light-exposed organs were much higher those in the dark.Expression levels of StMYB12A and C were high in flowers but low in tubers.Transient overexpression of miR858 altered potato flavonol metabolism.Endogenous StmiR858 expression was much lower in flowers than leaves and correlated with flavonol amounts in these organs.Collectively,these findings support the hypothesis that sucrose,MYBs,and miRNA control potato phenylpropanoid metabolism in a finely tuned manner that includes a feedback loop between sucrose and StAN1.These findings will aid in the development of potatoes with phenylpropanoid profiles optimized for crop performance and human health.

关 键 词：properties. finding media 

分 类 号：S532[农业科学—作物学]