首页|SlDELLA interacts with SlPIF4 to regulate arbuscular mycorrhizal symbiosis and phosphate uptake in tomato

SlDELLA interacts with SlPIF4 to regulate arbuscular mycorrhizal symbiosis and phosphate uptake in tomato

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Arbuscular mycorrhizal symbiosis(AMS),a complex and delicate process,is precisely regulated by a multitude of transcription factors.PHYTOCHROME-INTERACTING FACTORS(PIFs)are critical in plant growth and stress responses.However,the involvement of PIFs in AMS and the molecular mechanisms underlying their regulator functions have not been well elucidated.Here,we show that SlPIF4 negatively regulates the arbuscular mycorrhizal fungi(AMF)colonization and AMS-induced phosphate uptake in tomato.Protein-protein interaction studies suggest that SlDELLA interacts with SlPIF4,reducing its protein stability and inhibiting its transcriptional activity towards downstream target genes.This interaction promotes the accumulation of strigolactones(SLs),facilitating AMS development and phosphate uptake.As a transcription factor,SlPIF4 directly transcriptionally regulates genes involved in SLs biosynthesis,including SlCCD7,SlCDD8,and SlMAX1,as well as the AMS-specific phosphate transporter genes PT4 and PT5.Collectively,our findings uncover a molecular mechanism by which the SlDELLA-SlPIF4 module regulates AMS and phosphate uptake in tomato.We clarify a molecular basis for how SlPIF4 interacts with SLs to regulate the AMS and propose a potential strategy to improve phosphate utilization efficiency by targeting the AMS-specific phosphate transporter genes PTs.

Lan Li、Shibei Ge、Liqun He、Ruicheng Liu、Yuhong Mei、Xiaojian Xia、Jingquan Yu、Yanhong Zhou

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Department of Horticulture,Zijingang Campus,Zhejiang University,866 Yuhangtang Road,Hangzhou 310058,China

Tea Research Institute,Chinese Academy of Agricultural Science,Hangzhou 310008,China

Hainan Institute,Zhejiang University,Sanya 572025,China

Key Laboratory of Horticultural Plant Growth and Development,Ministry of Agriculture and Rural Affairs of China,Hangzhou 310058,China

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2024

10.1093/hr/uhae195

园艺研究(英文)

园艺研究(英文)

CSTPCD
ISSN：
年,卷(期)：2024.11(9)