植物磷转运蛋白1(phosphase transporter protein 1,PHT1)家族在植物磷吸收和转运中发挥着重要作用。为研究大麦PHT1基因家族成员的特性,利用生物信息学方法在全基因组范围内对大麦PHT1家族成员进行鉴定,结果共鉴定到14个大麦PHT1(HvPT1...植物磷转运蛋白1(phosphase transporter protein 1,PHT1)家族在植物磷吸收和转运中发挥着重要作用。为研究大麦PHT1基因家族成员的特性,利用生物信息学方法在全基因组范围内对大麦PHT1家族成员进行鉴定,结果共鉴定到14个大麦PHT1(HvPT1~HvPT14)基因,分布在2H、4H、5H和7H染色体上。根据系统发育关系、基因结构和保守蛋白基序,可将14个大麦PHT1基因分为3个亚群。基于RNA-seq数据对大麦品种GN121(磷高效基因型)根和叶片中12个PHT1基因的表达模式进行分析,发现在低磷胁迫处理下,根中HvPT1、HvPT7、HvPT10和HvPT12基因以及叶片中HvPT13基因均上调表达。进一步利用荧光定量PCR技术对大麦品种GN121和GN42(磷低效基因型)根中10个PHT1基因的表达模式进行分析,发现两个品种根中HvPT7、HvPT8、HvPT10、HvPT12和HvPT14基因在磷恢复后第3 d的表达量均显著低于低磷处理第22 d的表达量,推测这5个基因在低磷胁迫下参与磷的吸收和转运;此外HvPT5基因在磷恢复后第3 d的GN42根中表达量显著下降,而在GN121根中的表达量显著上升,说明HvPT5基因的表达与品种类型有关。展开更多
Phosphorus,an essential macroelement for plant growth and development,is a major limiting factor for sustainable crop yield.The Rho of plant(ROP)GTPase is involved in regulating multiple signal transduction processes ...Phosphorus,an essential macroelement for plant growth and development,is a major limiting factor for sustainable crop yield.The Rho of plant(ROP)GTPase is involved in regulating multiple signal transduction processes in plants,but potentially including the phosphate deficiency signaling pathway remains unknown.Here,we identified that the rop6 mutant exhibited a dramatic tolerant phenotype under Pi-deficient conditions,with higher phosphate accumulation and lower anthocyanin content.In contrast,the rop6 mutant was more sensitive to arsenate(As(V))toxicity,the analog of Pi.Immunoblot analysis displayed that the ROP6 protein was rapidly degraded through ubiquitin/26S proteasome pathway under Pi-deficient conditions.In addition,pull-down assay using GST-RIC1 demonstrated that the ROP6 activity was decreased obviously under Pi-deficient conditions.Strikingly,protein-protein interaction and two-voltage clamping assays demonstrated that ROP6 physically interacted with and inhibited the key phosphate uptake transporters PHT1;1 and PHT1;4 in vitro and in vivo.Moreover,genetic analysis showed that ROP6 functioned upstream of PHT1;1 and PHT1;4.Thus,we conclude that GTPase ROP6 modulates the uptake of phosphate by inhibiting the activities of PHT1;1 and PHT1;4 in Arabidopsis.展开更多
基金This research was funded by a grant from Northwest A&F University(Z111021604 to CW)the National Natural Science Foundation of China(31770289 to CW,31900218 to HLG)partly supported by open funds of the State Key Laboratory of Plant Physiology and Biochemistry(SKLPPBKF1902 to HLG).
文摘Phosphorus,an essential macroelement for plant growth and development,is a major limiting factor for sustainable crop yield.The Rho of plant(ROP)GTPase is involved in regulating multiple signal transduction processes in plants,but potentially including the phosphate deficiency signaling pathway remains unknown.Here,we identified that the rop6 mutant exhibited a dramatic tolerant phenotype under Pi-deficient conditions,with higher phosphate accumulation and lower anthocyanin content.In contrast,the rop6 mutant was more sensitive to arsenate(As(V))toxicity,the analog of Pi.Immunoblot analysis displayed that the ROP6 protein was rapidly degraded through ubiquitin/26S proteasome pathway under Pi-deficient conditions.In addition,pull-down assay using GST-RIC1 demonstrated that the ROP6 activity was decreased obviously under Pi-deficient conditions.Strikingly,protein-protein interaction and two-voltage clamping assays demonstrated that ROP6 physically interacted with and inhibited the key phosphate uptake transporters PHT1;1 and PHT1;4 in vitro and in vivo.Moreover,genetic analysis showed that ROP6 functioned upstream of PHT1;1 and PHT1;4.Thus,we conclude that GTPase ROP6 modulates the uptake of phosphate by inhibiting the activities of PHT1;1 and PHT1;4 in Arabidopsis.
