Salinity is a severe abiotic stress that affects plant growth and yield.Salinity stress activates jasmonate(JA)signaling in Arabidopsis thaliana,but the underlying molecular mechanism remains to be elucidated.In this ...Salinity is a severe abiotic stress that affects plant growth and yield.Salinity stress activates jasmonate(JA)signaling in Arabidopsis thaliana,but the underlying molecular mechanism remains to be elucidated.In this study,we confirmed the activation of JA signaling under saline conditions and demonstrated the importance of the CORONATINE INSENSITIVE1(COI1)-mediated JA signaling for this process.Phenotypic analyses reflected the negative regulation of JASMONATE ZIM-DOMAIN(JAZ)repressors during salinity stress-enhanced JA signaling.Mechanistic analyses revealed that JAZ proteins physically interact with ABSCISIC ACID-RESPONSIVE ELEMENT BINDING FACTOR1(ABF1),AREB1/ABF2,ABF3,and AREB2/ABF4,which belong to the basic leucine zipper(bZIP)transcription factor family and respond to salinity stress.Analyses on the ABF3 overexpression plants and ABF mutants indicated the positive role of ABF3 in regulating JA signaling under saline condition.Furthermore,ABF3 overexpression partially recovered the JA-related phenotypes of JAZ1-D3A plants.Moreover,ABF3 was observed to indirectly activate ALLENE OXIDE SYNTHASE(AOS)transcription,but this activation was inhibited by JAZ1.In addition,ABF3 competitively bind to JAZ1,thereby decreasing the interaction between JAZ1 and MYC2,which is the master transcription factor controlling JA signaling.Collectively,our findings have clarified the regulatory effects of ABF3 on JA signaling and provide new insights into how JA signaling is enhanced following an exposure to salinity stress.展开更多
本文以拟南芥ABF3基因编码区上游1631 bp的序列驱动的报告基因GUS的转基因拟南芥为对象,研究了ABF3基因的组织特异性、ABA处理、高盐处理、低渗处理等因素影响下的表达模式。基于启动子顺式作用元件库PLACE对ABF3上游序列的分析显示,该...本文以拟南芥ABF3基因编码区上游1631 bp的序列驱动的报告基因GUS的转基因拟南芥为对象,研究了ABF3基因的组织特异性、ABA处理、高盐处理、低渗处理等因素影响下的表达模式。基于启动子顺式作用元件库PLACE对ABF3上游序列的分析显示,该序列中含有多个与逆境应答、激素信号和光信号相关的顺式作用元件。q RT-PCR结果表明,在50 m M Na Cl处理下ABF3的m RNA含量无显著变化,而100和150 m M处理时,ABF3的m RNA含量升高至对照的3倍左右;50和100 m M山梨醇处理下,ABF3的m RNA含量分别为对照的1.7和2.4倍,处理浓度为150 m M时,ABF3的m RNA含量和对照无显著差异;在ABA处理下,ABF3的m RNA含量显著升高,10μM时ABF3的m RNA含量为对照的17倍。而低温处理下,ABF3的m RNA含量则显著降低,仅为对照的0.2倍。这些结果均表明ABF3在拟南芥苗期响应高盐、低温和ABA等多个过程。展开更多
The drought-escape response accelerates flowering in response to drought stress, allowing plants to adaptively shorten their life cycles. Abscisic acid (ABA) mediates plant responses to drought, but the role of ABA-re...The drought-escape response accelerates flowering in response to drought stress, allowing plants to adaptively shorten their life cycles. Abscisic acid (ABA) mediates plant responses to drought, but the role of ABA-responsive element (ABRE)-binding factors (ABFs) in the drought-escape response is poorly understood. Here, we show that Arabidopsis thaliana ABF3 and ABF4 regulate flowering in response to drought through transcriptional regulation of the floral integrator SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 (SOC1). The abf3 abf4 mutant displayed ABA-insensitive late flowering under long-day conditions. Ectopic expression of ABF3 or ABF4 in the vasculature, but not in the shoot apex, induced early flowering, whereas expression of ABF3 fused with the SRDX transcript!onal repressor domain delayed flowering. We identified SOC1 as a direct downstream target of ABF3/4, and found that SOC1 mRNA levels were lower in abf3 abf4 than in wild-type plants. Moreover, induction of SOC1 by ABA was hampered in abf3 abf4 mutants. ABF3 and ABF4 were enriched at the -1028- to -657-bp region of the SOC1 promoter, which does not contain canonical ABF-ABRE-binding motifs but has the NF-Y binding element. We found that ABF3 and ABF4 interact with nuclear factor Y subunit C (NF-YC) 3/4/9 in vitro and in planta, and induction of SOC1 by ABA was hampered in nf-yc3 yc4 yc9 mutants. Interestingly, the abf3 abf4, nf-yc3 yc4 yc9, and sod mutants displayed a reduced drought-escape response. Taken together, these results suggest that ABF3 and ABF4 act with NF-YCs to promote flowering by inducing SOC1 transcription under drought conditions . This mechanism might contribute to adaptation by enabling plants to complete their life cycles under drought stress.展开更多
The tetragonal distortions of Gd 3+-VB and Gd 3+-M + centers in fluoroperovskites ABF3 （A=K,Rb,Cs;B= Cd,Ca） are studied by calculating the EPR zero-field splitting b 02. From the studies,an interesting trend is foun...The tetragonal distortions of Gd 3+-VB and Gd 3+-M + centers in fluoroperovskites ABF3 （A=K,Rb,Cs;B= Cd,Ca） are studied by calculating the EPR zero-field splitting b 02. From the studies,an interesting trend is found,i.e., when the size of M + ion is close to that of the replaced host ion,the tetragonal distortion ΔR in Gd 3+-M + centers is smaller than that in Gd 3+-VB center,whereas when the size of M + ion is much smaller than that of the replaced host ion,the distortion ΔR becomes larger. The causes of the trend are discussed.展开更多
基金supported by the Natural Science Foundation of China(32270613,31922009,and 31870259)the Yunnan Fundamental Research Projects(202201AS070051,202001AV070009,2019FI006,202001AT070118,and 202101AW070005,202401AT070220)+1 种基金the CAS“Light of West China”Program(to X.H.)the Youth Innovation Promotion Association of the of Chinese Academy of Sciences(Y201973 and 2022399).
文摘Salinity is a severe abiotic stress that affects plant growth and yield.Salinity stress activates jasmonate(JA)signaling in Arabidopsis thaliana,but the underlying molecular mechanism remains to be elucidated.In this study,we confirmed the activation of JA signaling under saline conditions and demonstrated the importance of the CORONATINE INSENSITIVE1(COI1)-mediated JA signaling for this process.Phenotypic analyses reflected the negative regulation of JASMONATE ZIM-DOMAIN(JAZ)repressors during salinity stress-enhanced JA signaling.Mechanistic analyses revealed that JAZ proteins physically interact with ABSCISIC ACID-RESPONSIVE ELEMENT BINDING FACTOR1(ABF1),AREB1/ABF2,ABF3,and AREB2/ABF4,which belong to the basic leucine zipper(bZIP)transcription factor family and respond to salinity stress.Analyses on the ABF3 overexpression plants and ABF mutants indicated the positive role of ABF3 in regulating JA signaling under saline condition.Furthermore,ABF3 overexpression partially recovered the JA-related phenotypes of JAZ1-D3A plants.Moreover,ABF3 was observed to indirectly activate ALLENE OXIDE SYNTHASE(AOS)transcription,but this activation was inhibited by JAZ1.In addition,ABF3 competitively bind to JAZ1,thereby decreasing the interaction between JAZ1 and MYC2,which is the master transcription factor controlling JA signaling.Collectively,our findings have clarified the regulatory effects of ABF3 on JA signaling and provide new insights into how JA signaling is enhanced following an exposure to salinity stress.
文摘本文以拟南芥ABF3基因编码区上游1631 bp的序列驱动的报告基因GUS的转基因拟南芥为对象,研究了ABF3基因的组织特异性、ABA处理、高盐处理、低渗处理等因素影响下的表达模式。基于启动子顺式作用元件库PLACE对ABF3上游序列的分析显示,该序列中含有多个与逆境应答、激素信号和光信号相关的顺式作用元件。q RT-PCR结果表明,在50 m M Na Cl处理下ABF3的m RNA含量无显著变化,而100和150 m M处理时,ABF3的m RNA含量升高至对照的3倍左右;50和100 m M山梨醇处理下,ABF3的m RNA含量分别为对照的1.7和2.4倍,处理浓度为150 m M时,ABF3的m RNA含量和对照无显著差异;在ABA处理下,ABF3的m RNA含量显著升高,10μM时ABF3的m RNA含量为对照的17倍。而低温处理下,ABF3的m RNA含量则显著降低,仅为对照的0.2倍。这些结果均表明ABF3在拟南芥苗期响应高盐、低温和ABA等多个过程。
文摘The drought-escape response accelerates flowering in response to drought stress, allowing plants to adaptively shorten their life cycles. Abscisic acid (ABA) mediates plant responses to drought, but the role of ABA-responsive element (ABRE)-binding factors (ABFs) in the drought-escape response is poorly understood. Here, we show that Arabidopsis thaliana ABF3 and ABF4 regulate flowering in response to drought through transcriptional regulation of the floral integrator SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 (SOC1). The abf3 abf4 mutant displayed ABA-insensitive late flowering under long-day conditions. Ectopic expression of ABF3 or ABF4 in the vasculature, but not in the shoot apex, induced early flowering, whereas expression of ABF3 fused with the SRDX transcript!onal repressor domain delayed flowering. We identified SOC1 as a direct downstream target of ABF3/4, and found that SOC1 mRNA levels were lower in abf3 abf4 than in wild-type plants. Moreover, induction of SOC1 by ABA was hampered in abf3 abf4 mutants. ABF3 and ABF4 were enriched at the -1028- to -657-bp region of the SOC1 promoter, which does not contain canonical ABF-ABRE-binding motifs but has the NF-Y binding element. We found that ABF3 and ABF4 interact with nuclear factor Y subunit C (NF-YC) 3/4/9 in vitro and in planta, and induction of SOC1 by ABA was hampered in nf-yc3 yc4 yc9 mutants. Interestingly, the abf3 abf4, nf-yc3 yc4 yc9, and sod mutants displayed a reduced drought-escape response. Taken together, these results suggest that ABF3 and ABF4 act with NF-YCs to promote flowering by inducing SOC1 transcription under drought conditions . This mechanism might contribute to adaptation by enabling plants to complete their life cycles under drought stress.
文摘The tetragonal distortions of Gd 3+-VB and Gd 3+-M + centers in fluoroperovskites ABF3 （A=K,Rb,Cs;B= Cd,Ca） are studied by calculating the EPR zero-field splitting b 02. From the studies,an interesting trend is found,i.e., when the size of M + ion is close to that of the replaced host ion,the tetragonal distortion ΔR in Gd 3+-M + centers is smaller than that in Gd 3+-VB center,whereas when the size of M + ion is much smaller than that of the replaced host ion,the distortion ΔR becomes larger. The causes of the trend are discussed.
