Cadmium(Cd)contamination in soil poses a huge threat to plants even at low concentrations;Broussonetia papyrifera has great potential in remediation of soil heavy metal contamination.However,whether exogenous indole-3...Cadmium(Cd)contamination in soil poses a huge threat to plants even at low concentrations;Broussonetia papyrifera has great potential in remediation of soil heavy metal contamination.However,whether exogenous indole-3-acetic acid(IAA)application and arbuscular mycorrhizal fungi(AMF)have synergistic effects on Cd tolerance of B.papyrifera remains unclear.To investigate the effects of AMF inoculation and IAA application on the tolerance of B.papyrifera to Cd stress,two experiments were conducted:the first to investigate the effect of AMF(Rhizophagus irregularis)inoculation on the tolerance of B.papyrifera to Cd stress and the second to investigate the combined effects of AMF inoculation and IAA application on the tolerance of B.papyrifera to Cd stress.Parameters including endogenous hormone concentration,antioxidant defense response,malondialdehyde(MDA)content,and gene expression related to antioxidant enzyme system and hormone were measured.The results indicated that AMF alleviated Cd toxicity of B.papyrifera by reducing MDA content and improving antioxidant enzyme activities and Cd absorption capacity.Furthermore,the combination of AMF inoculation and IAA application had a synergetic effect on the tolerance of B.papyrifera to Cd stress through upregulating BpAUX1 and BpAUX2,which might contribute to root growth and root xylem synthesis,and by upregulating BpSOD2 and BpPOD34 to enhance the antioxidant enzyme system.This work provides a new insight into the application of IAA in the remediation of soil Cd pollution by mycorrhizal plants.展开更多
以芹菜(Apium graveolens)‘六合黄心芹’、‘津南实芹’和‘美国西芹’为试验材料,采用RT-PCR技术分别获得其cDNA序列。序列分析表明:来源于3个芹菜品种的非特异性脂转移蛋白(Non-specific lipid transfer protein,nsLTP)基因核苷酸序...以芹菜(Apium graveolens)‘六合黄心芹’、‘津南实芹’和‘美国西芹’为试验材料,采用RT-PCR技术分别获得其cDNA序列。序列分析表明:来源于3个芹菜品种的非特异性脂转移蛋白(Non-specific lipid transfer protein,nsLTP)基因核苷酸序列高度保守,全长357bp,编码118个氨基酸,起始密码子ATG之后含有27个氨基酸残基的信号肽序列,推测其成熟的蛋白含91个氨基酸残基,预测其蛋白质分子量为11.75kD,pI值为9.36。芹菜的nsLTP蛋白主要由α-螺旋和随机卷曲组成。空间结构上分析显示,芹菜nsLTP蛋白中H1区域明显分为H1a和H1b两个亚区域,而模板碧桃中H1区域为一个连续的螺旋结构,存在明显的差异。进化分析显示,芹菜nsLTP与香石竹、大洋洲滨藜等植物的nsLTP相似性较高,在保守位置具有8个半胱氨酸残基。实时定量PCR表达分析表明,该基因主要在芹菜的茎以及茎尖生长活跃中心表达,具有明显的组织特异性。展开更多
基金supported by the National Natural Science Foundation of China(Nos.32001289 and 32071639)the Laboratory of Lingnan Modern Agriculture Project,China(No.NZ2021025)。
文摘Cadmium(Cd)contamination in soil poses a huge threat to plants even at low concentrations;Broussonetia papyrifera has great potential in remediation of soil heavy metal contamination.However,whether exogenous indole-3-acetic acid(IAA)application and arbuscular mycorrhizal fungi(AMF)have synergistic effects on Cd tolerance of B.papyrifera remains unclear.To investigate the effects of AMF inoculation and IAA application on the tolerance of B.papyrifera to Cd stress,two experiments were conducted:the first to investigate the effect of AMF(Rhizophagus irregularis)inoculation on the tolerance of B.papyrifera to Cd stress and the second to investigate the combined effects of AMF inoculation and IAA application on the tolerance of B.papyrifera to Cd stress.Parameters including endogenous hormone concentration,antioxidant defense response,malondialdehyde(MDA)content,and gene expression related to antioxidant enzyme system and hormone were measured.The results indicated that AMF alleviated Cd toxicity of B.papyrifera by reducing MDA content and improving antioxidant enzyme activities and Cd absorption capacity.Furthermore,the combination of AMF inoculation and IAA application had a synergetic effect on the tolerance of B.papyrifera to Cd stress through upregulating BpAUX1 and BpAUX2,which might contribute to root growth and root xylem synthesis,and by upregulating BpSOD2 and BpPOD34 to enhance the antioxidant enzyme system.This work provides a new insight into the application of IAA in the remediation of soil Cd pollution by mycorrhizal plants.
文摘以芹菜(Apium graveolens)‘六合黄心芹’、‘津南实芹’和‘美国西芹’为试验材料,采用RT-PCR技术分别获得其cDNA序列。序列分析表明:来源于3个芹菜品种的非特异性脂转移蛋白(Non-specific lipid transfer protein,nsLTP)基因核苷酸序列高度保守,全长357bp,编码118个氨基酸,起始密码子ATG之后含有27个氨基酸残基的信号肽序列,推测其成熟的蛋白含91个氨基酸残基,预测其蛋白质分子量为11.75kD,pI值为9.36。芹菜的nsLTP蛋白主要由α-螺旋和随机卷曲组成。空间结构上分析显示,芹菜nsLTP蛋白中H1区域明显分为H1a和H1b两个亚区域,而模板碧桃中H1区域为一个连续的螺旋结构,存在明显的差异。进化分析显示,芹菜nsLTP与香石竹、大洋洲滨藜等植物的nsLTP相似性较高,在保守位置具有8个半胱氨酸残基。实时定量PCR表达分析表明,该基因主要在芹菜的茎以及茎尖生长活跃中心表达,具有明显的组织特异性。
