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Identification of two glycerophosphodiester phosphodiesterase genes in maize leaf phosphorus remobilization

The Crop Journal 2021年第1期9卷 95-108页

作者： Jingxin Wang Wenbo Pan Alexiy Nikiforov William King Wanting Hong Weiwei Li Yang Han jana patton-vogt Jianbo Shen Lingyun Cheng Key Laboratory of Plant-Soil Interactions Ministry of Education/Key Laboratory of Plant NutritionMinistry of AgricultureDepartment of Plant NutritionChina Agricultural UniversityBeijing 100193China State Key Laboratory of Plant Genomics Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China Department of Biological Sciences Duquesne UniversityPittsburghPA 15282USA

Phosphate deficiency is one of the leading causes of crop productivity *** degradation liberates phosphate to cope with phosphate *** phosphodiesterases(GPX-PDEs)hydrolyse the intermediate products of phospholipid catabolism glycerophosphodiesters into glycerol-3-phosphate,a precursor of ***,the function of GPX-PDEs in phosphate remobilization in maize remains *** the present study,we characterized two phosphate deficiency-inducible GPX-PDE genes,ZmGPX-PDE1 and ZmGPX-PDE5,in maize ***-PDE1 and ZmGPX-PDE5 were transcriptionally regulated by ZmPHR1,a well-described phosphate starvation-responsive transcription factor of the MYB *** of the yeast GPX-PDE mutant gde1Δindicated that ZmGPX-PDE1 and ZmGPX-PDE5 functioned as GPX-PDEs,suggesting their roles in phosphate recycling from *** vitro enzyme assays showed that ZmGPX-PDE1 and ZmGPX-PDE5 catalysed glycerophosphodiester degradation with different substrate preferences for glycerophosphoinositol and glycerophosphocholine,***-PDE1 was upregulated during leaf senescence,and more remarkably,loss of ZmGPXPDE1 inmaize compromised the remobilization of phosphorus fromsenescing leaves to young leaves,resulting in a stay-green phenotype under phosphate *** results suggest that ZmGPX-PDE1 catalyses the degradation of glycerophosphodiesters in maize,promoting phosphate recycling from senescing leaves to new *** mechanism is crucial for improving phosphorus utilization efficiency in crops.

关键词： Glycerophosphodiester phosphodiesterases Maize Phosphate deficiency Phosphorus remobilization Phospholipid

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