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Li J, Chen Y, Zhou G, Li M. Phytohormones and candidate genes synergistically regulate fruitlet abscission in Areca catechu L. BMC PLANT BIOLOGY 2023; 23:537. [PMID: 37919647 PMCID: PMC10623784 DOI: 10.1186/s12870-023-04562-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 10/26/2023] [Indexed: 11/04/2023]
Abstract
BACKGROUND The fruit population of most plants is under the control of a process named "physiological drop" to selectively abort some developing fruitlets. However, frequent fruitlet abscission severely restricts the yield of Areca catechu. To reveal the physiological and molecular variations in this process, we detected the variation of phytohormone levels in abscised and non-abscised fruitlets in A. catechu. RESULTS The levels of gibberellin acid, jasmonic acid, salicylic acid, abscisic acid and zeatin were elevated, while the indole-3-acetic acid and indole-3-carboxaldehyde levels were declined in the "about-to-abscise" part (AB) of abscission zone (AZ) compared to the "non-abscised" part (CK). Then the differentially expressed genes (DEGs) between AB and CK were screened based on transcriptome data. DEGs involved in phytohormone synthesis, response and transportation were identified as key genes. Genes related to cell wall biosynthesis, degradation, loosening and modification, and critical processes during fruit abscission were identified as role players. In addition, genes encoding transcription factors, such as NAC, ERF, WRKY, MADS and Zinc Finger proteins, showed differentially expressed patterns between AB and CK, were also identified as candidates. CONCLUSIONS These results unraveled a phytohormone signaling cross talk and key genes involved in the fruitlet abscission process in A. catechu. This study not only provides a theoretical basis for fruitlet abscission in A. catechu, but also identified many candidate genes or potential molecular markers for further breeding of fruit trees.
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Affiliation(s)
- Jia Li
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Crops, Hainan University, Haikou, 570228, China
- Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang, 571339, Hainan, China
| | - Yunche Chen
- Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang, 571339, Hainan, China
| | - Guangzhen Zhou
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Crops, Hainan University, Haikou, 570228, China
| | - Meng Li
- College of Life Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan, 410004, P. R. China.
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Yue P, Jiang Z, Sun Q, Wei R, Yin Y, Xie Z, Larkin RM, Ye J, Chai L, Deng X. Jasmonate activates a CsMPK6-CsMYC2 module that regulates the expression of β-citraurin biosynthetic genes and fruit coloration in orange (Citrus sinensis). THE PLANT CELL 2023; 35:1167-1185. [PMID: 36530163 PMCID: PMC10052374 DOI: 10.1093/plcell/koac363] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Carotenoids are natural pigments that influence the color of citrus fruit. The red-colored carotenoid β-citraurin is responsible for the peel color in "Newhall" orange (Citrus sinensis). Although jasmonates are known to regulate the biosynthesis and accumulation of carotenoids, their effects on β-citraurin biosynthesis in citrus fruit remain unclear. Here, we determined that treatment with methyl jasmonate (MeJA) significantly promotes fruit coloration and β-citraurin production in "Newhall" orange. A MeJA treatment induced the expression of CsMYC2, which encodes a transcription factor that serves as a master regulator of jasmonate responses. CsMYC2 bound the promoter of the gene that encodes carotenoid cleavage dioxygenase 4b (CsCCD4b), the key gene for β-citraurin biosynthesis, and the promoters of genes that encode phytoene synthase (CsPSY), lycopene β-cyclase (CsLCYb), and β-carotene hydroxylase (CsBCH) and induced their expression. In addition, CsMYC2 promoted CsMPK6 expression. Notably, we found that CsMPK6 interacted with CsMYC2 and that this interaction decreased the stability and DNA-binding activity of CsMYC2. Thus, we conclude that negative feedback regulation attenuates JA signaling during the jasmonate-induced coloration of citrus fruit. Together, our findings indicate that jasmonates induce β-citraurin biosynthesis in citrus by activating a CsMPK6-CsMYC2 cascade, thereby affecting fruit coloration.
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Affiliation(s)
| | - Zhenghua Jiang
- Key Laboratory of Horticultural Plant Biology of MOE (Ministry of Education), Huazhong Agricultural University Wuhan, Hubei 430070, China
| | - Quan Sun
- Key Laboratory of Horticultural Plant Biology of MOE (Ministry of Education), Huazhong Agricultural University Wuhan, Hubei 430070, China
| | - Ranran Wei
- Key Laboratory of Horticultural Plant Biology of MOE (Ministry of Education), Huazhong Agricultural University Wuhan, Hubei 430070, China
| | - Yingzi Yin
- Key Laboratory of Horticultural Plant Biology of MOE (Ministry of Education), Huazhong Agricultural University Wuhan, Hubei 430070, China
| | - Zongzhou Xie
- Key Laboratory of Horticultural Plant Biology of MOE (Ministry of Education), Huazhong Agricultural University Wuhan, Hubei 430070, China
| | - Robert M Larkin
- Key Laboratory of Horticultural Plant Biology of MOE (Ministry of Education), Huazhong Agricultural University Wuhan, Hubei 430070, China
| | - Junli Ye
- Key Laboratory of Horticultural Plant Biology of MOE (Ministry of Education), Huazhong Agricultural University Wuhan, Hubei 430070, China
| | - Lijun Chai
- Key Laboratory of Horticultural Plant Biology of MOE (Ministry of Education), Huazhong Agricultural University Wuhan, Hubei 430070, China
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Zou X, Sun H. DOF transcription factors: Specific regulators of plant biological processes. FRONTIERS IN PLANT SCIENCE 2023; 14:1044918. [PMID: 36743498 PMCID: PMC9897228 DOI: 10.3389/fpls.2023.1044918] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 01/03/2023] [Indexed: 06/12/2023]
Abstract
Plant biological processes, such as growth and metabolism, hormone signal transduction, and stress responses, are affected by gene transcriptional regulation. As gene expression regulators, transcription factors activate or inhibit target gene transcription by directly binding to downstream promoter elements. DOF (DNA binding with One Finger) is a classic transcription factor family exclusive to plants that is characterized by its single zinc finger structure. With breakthroughs in taxonomic studies of different species in recent years, many DOF members have been reported to play vital roles throughout the plant life cycle. They are not only involved in regulating hormone signals and various biotic or abiotic stress responses but are also reported to regulate many plant biological processes, such as dormancy, tissue differentiation, carbon and nitrogen assimilation, and carbohydrate metabolism. Nevertheless, some outstanding issues remain. This article mainly reviews the origin and evolution, protein structure, and functions of DOF members reported in studies published in many fields to clarify the direction for future research on DOF transcription factors.
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Affiliation(s)
- Xiaoman Zou
- Key Laboratory of Protected Horticulture of Education Ministry, College of Horticulture, Shenyang Agricultural University, Shenyang, China
| | - Hongmei Sun
- Key Laboratory of Protected Horticulture of Education Ministry, College of Horticulture, Shenyang Agricultural University, Shenyang, China
- National and Local Joint Engineering Research Center of Northern Horticultural Facilities Design and Application Technology, Shenyang, China
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Li J, Jia X, Yang Y, Chen Y, Wang L, Liu L, Li M. Genome-Wide Identification of the DOF Gene Family Involved in Fruitlet Abscission in Areca catechu L. Int J Mol Sci 2022; 23:ijms231911768. [PMID: 36233072 PMCID: PMC9569674 DOI: 10.3390/ijms231911768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 09/23/2022] [Accepted: 09/30/2022] [Indexed: 11/16/2022] Open
Abstract
Fruitlet abscission frequently occurs in Areca catechu L. and causes considerable production loss. However, the inducement mechanism of fruitlet abscission remains mysterious. In this study, we observed that the cell architecture in the abscission zone (AZ) was distinct with surrounding tissues, and varied obviously before and after abscission. Transcriptome analysis of the “about-to-abscise” and “non-abscised” AZs were performed in A. catechu, and the genes encoding the plant-specific DOF (DNA-binding with one finger) transcription factors showed a uniform up-regulation in AZ, suggesting a role of the DOF transcription in A. catechu fruitlet abscission. In total, 36 members of the DOF gene family distributed in 13 chromosomes were identified from the A. catechu genome. The 36 AcDOF genes were classified into nine subgroups based on phylogenic analysis. Six of them showed an AZ-specific expression pattern, and their expression levels varied according to the abscission process. In total, nine types of phytohormone response cis-elements and five types of abiotic stress related cis-elements were identified in the promoter regions of the AcDOF genes. In addition, histochemical staining showed that lignin accumulation of vascular bundles in AZ was significantly lower than that in pedicel and mesocarp, indicating the specific characteristics of the cell architecture in AZ. Our data suggests that the DOF transcription factors might play a role in fruitlet abscission regulation in A. catechu.
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Affiliation(s)
- Jia Li
- Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang 571339, China
| | - Xiaocheng Jia
- Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang 571339, China
| | - Yaodong Yang
- Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang 571339, China
| | - Yunche Chen
- Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang 571339, China
- College of Life Sciences, Chongqing Normal University, Chongqing 401331, China
| | - Linkai Wang
- Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang 571339, China
| | - Liyun Liu
- Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang 571339, China
| | - Meng Li
- College of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China
- Correspondence: ; Tel.: +86-13319516033
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Crosstalk between Hydrogen Sulfide and Other Signal Molecules Regulates Plant Growth and Development. Int J Mol Sci 2020; 21:ijms21134593. [PMID: 32605208 PMCID: PMC7370202 DOI: 10.3390/ijms21134593] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 06/24/2020] [Accepted: 06/24/2020] [Indexed: 12/17/2022] Open
Abstract
Hydrogen sulfide (H2S), once recognized only as a poisonous gas, is now considered the third endogenous gaseous transmitter, along with nitric oxide (NO) and carbon monoxide (CO). Multiple lines of emerging evidence suggest that H2S plays positive roles in plant growth and development when at appropriate concentrations, including seed germination, root development, photosynthesis, stomatal movement, and organ abscission under both normal and stress conditions. H2S influences these processes by altering gene expression and enzyme activities, as well as regulating the contents of some secondary metabolites. In its regulatory roles, H2S always interacts with either plant hormones, other gasotransmitters, or ionic signals, such as abscisic acid (ABA), ethylene, auxin, CO, NO, and Ca2+. Remarkably, H2S also contributes to the post-translational modification of proteins to affect protein activities, structures, and sub-cellular localization. Here, we review the functions of H2S at different stages of plant development, focusing on the S-sulfhydration of proteins mediated by H2S and the crosstalk between H2S and other signaling molecules.
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Ventimilla D, Domingo C, González-Ibeas D, Talon M, Tadeo FR. Differential expression of IDA (INFLORESCENCE DEFICIENT IN ABSCISSION)-like genes in Nicotiana benthamiana during corolla abscission, stem growth and water stress. BMC PLANT BIOLOGY 2020; 20:34. [PMID: 31959115 PMCID: PMC6971993 DOI: 10.1186/s12870-020-2250-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 01/14/2020] [Indexed: 05/06/2023]
Abstract
BACKGROUND IDA (INFLORESCENCE DEFICIENT IN ABSCISSION)-like signaling peptides and the associated HAE (HAESA)-like family of receptor kinases were originally reported in the model plant Arabidopsis thaliana (Arabidopsis) to be deeply involved in the regulation of abscission. Actually, IDA peptides, as cell-to-cell communication elements, appear to be implicated in many developmental processes that rely on cell separation events, and even in the responses to abiotic stresses. However, the knowledge related to the molecular machinery regulating abscission in economically important crops is scarce. In this work, we determined the conservation and phylogeny of the IDA-like and HAE-like gene families in relevant species of the Solanaceae family and analyzed the expression of these genes in the allopolyploid Nicotiana benthamiana, in order to identify members involved in abscission, stem growth and in the response to drought conditions. RESULTS The phylogenetic relationships among the IDA-like members of the Solanaceae studied, grouped the two pairs of NbenIDA1 and NbenIDA2 protein homeologs with the Arabidopsis prepropeptides related to abscission. Analysis of promoter regions searching for regulatory elements showed that these two pairs of homeologs contained both hormonal and drought response elements, although NbenIDA2A lacked the hormonal regulatory elements. Expression analyses showed that the pair of NbenIDA1 homeologs were upregulated during corolla abscission. NbenIDA1 and NbenIDA2 pairs showed tissue differential expression under water stress conditions, since NbenIDA1 homeologs were highly expressed in stressed leaves while NbenIDA2 homeologs, especially NbenIDA2B, were highly expressed in stressed roots. In non-stressed active growing plants, nodes and internodes were the tissues with the highest expression levels of all members of the IDA-like family and their putative HAE-like receptors. CONCLUSION Our results suggest that the pair of NbenIDA1 homeologs are involved in the natural process of corolla abscission while both pairs of NbenIDA1 and NbenIDA2 homeologs are implicated in the response to water stress. The data also suggest that IDA peptides may be important during stem growth and development. These results provide additional evidence that the functional module formed by IDA peptides and its receptor kinases, as defined in Arabidopsis, may also be conserved in Solanaceae.
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Affiliation(s)
- Daniel Ventimilla
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), CV-315, Km 10,7 Moncada, E-46113 Valencia, Spain
| | - Concha Domingo
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), CV-315, Km 10,7 Moncada, E-46113 Valencia, Spain
| | - Daniel González-Ibeas
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), CV-315, Km 10,7 Moncada, E-46113 Valencia, Spain
| | - Manuel Talon
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), CV-315, Km 10,7 Moncada, E-46113 Valencia, Spain
| | - Francisco R. Tadeo
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), CV-315, Km 10,7 Moncada, E-46113 Valencia, Spain
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Ventimilla D, Domingo C, González-Ibeas D, Talon M, Tadeo FR. Differential expression of IDA (INFLORESCENCE DEFICIENT IN ABSCISSION)-like genes in Nicotiana benthamiana during corolla abscission, stem growth and water stress. BMC PLANT BIOLOGY 2020; 20:34. [PMID: 31959115 DOI: 10.1186/s12870-020-2250-2258] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 01/14/2020] [Indexed: 05/27/2023]
Abstract
BACKGROUND IDA (INFLORESCENCE DEFICIENT IN ABSCISSION)-like signaling peptides and the associated HAE (HAESA)-like family of receptor kinases were originally reported in the model plant Arabidopsis thaliana (Arabidopsis) to be deeply involved in the regulation of abscission. Actually, IDA peptides, as cell-to-cell communication elements, appear to be implicated in many developmental processes that rely on cell separation events, and even in the responses to abiotic stresses. However, the knowledge related to the molecular machinery regulating abscission in economically important crops is scarce. In this work, we determined the conservation and phylogeny of the IDA-like and HAE-like gene families in relevant species of the Solanaceae family and analyzed the expression of these genes in the allopolyploid Nicotiana benthamiana, in order to identify members involved in abscission, stem growth and in the response to drought conditions. RESULTS The phylogenetic relationships among the IDA-like members of the Solanaceae studied, grouped the two pairs of NbenIDA1 and NbenIDA2 protein homeologs with the Arabidopsis prepropeptides related to abscission. Analysis of promoter regions searching for regulatory elements showed that these two pairs of homeologs contained both hormonal and drought response elements, although NbenIDA2A lacked the hormonal regulatory elements. Expression analyses showed that the pair of NbenIDA1 homeologs were upregulated during corolla abscission. NbenIDA1 and NbenIDA2 pairs showed tissue differential expression under water stress conditions, since NbenIDA1 homeologs were highly expressed in stressed leaves while NbenIDA2 homeologs, especially NbenIDA2B, were highly expressed in stressed roots. In non-stressed active growing plants, nodes and internodes were the tissues with the highest expression levels of all members of the IDA-like family and their putative HAE-like receptors. CONCLUSION Our results suggest that the pair of NbenIDA1 homeologs are involved in the natural process of corolla abscission while both pairs of NbenIDA1 and NbenIDA2 homeologs are implicated in the response to water stress. The data also suggest that IDA peptides may be important during stem growth and development. These results provide additional evidence that the functional module formed by IDA peptides and its receptor kinases, as defined in Arabidopsis, may also be conserved in Solanaceae.
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Affiliation(s)
- Daniel Ventimilla
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), CV-315, Km 10,7 Moncada, E-46113, Valencia, Spain
| | - Concha Domingo
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), CV-315, Km 10,7 Moncada, E-46113, Valencia, Spain
| | - Daniel González-Ibeas
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), CV-315, Km 10,7 Moncada, E-46113, Valencia, Spain
| | - Manuel Talon
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), CV-315, Km 10,7 Moncada, E-46113, Valencia, Spain
| | - Francisco R Tadeo
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias (IVIA), CV-315, Km 10,7 Moncada, E-46113, Valencia, Spain.
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Zou L, Liu W, Zhang Z, Edwards EJ, Gathunga EK, Fan P, Duan W, Li S, Liang Z. Gene body demethylation increases expression and is associated with self-pruning during grape genome duplication. HORTICULTURE RESEARCH 2020; 7:84. [PMID: 32528696 PMCID: PMC7261773 DOI: 10.1038/s41438-020-0303-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 02/11/2020] [Accepted: 03/19/2020] [Indexed: 05/15/2023]
Abstract
A colchicine-induced autotetraploid grapevine exhibiting potentially valuable agronomic traits for grape production and breeding, including self-pruning, was identified. This study investigated DNA methylation variation and its role in gene expression during self-pruning in the autotetraploid grapevine. We used RNA-Seq to estimate differentially expressed genes between diploid and autotetraploid grapevine shoot tips. The genes showing increases in the autotetraploid were mainly related to stress response pathways, whereas those showing decreases in the autotetraploid were related to biological metabolism and biosynthesis. Whole-genome bisulfite sequencing was performed to produce single-base methylomes for the diploid and autotetraploid grapevines. Comparison between the methylomes revealed that they were conserved in CG and CHG contexts. In the autotetraploid grapevine, hypodifferentially methylated regions (DMRs) and hyper-DMRs in the gene body increased or decreased gene expression, respectively. Our results indicated that a hypo-DMR in the ACO1 gene body increased its expression and might promote self-pruning. This study reports that hypo-DMRs in the gene body increase gene expression in plants and reveals the mechanism underlying the changes in the modifications affecting gene expression during genome duplication. Overall, our results provide valuable information for understanding the relationships between DNA methylation, gene expression, and autotetraploid breeding in grape.
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Affiliation(s)
- Luming Zou
- Beijing Key Laboratory of Grape Science and Enology and CAS Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 PR China
- University of the Chinese Academy of Sciences, Beijing, 100049 PR China
| | - Wenwen Liu
- Beijing Key Laboratory of Grape Science and Enology and CAS Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 PR China
- University of the Chinese Academy of Sciences, Beijing, 100049 PR China
| | - Zhan Zhang
- Beijing Key Laboratory of Grape Science and Enology and CAS Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 PR China
- University of the Chinese Academy of Sciences, Beijing, 100049 PR China
- College of Life Science, Shanxi Normal University, Shanxi, 041004 PR China
| | | | - Elias Kirabi Gathunga
- Beijing Key Laboratory of Grape Science and Enology and CAS Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 PR China
- University of the Chinese Academy of Sciences, Beijing, 100049 PR China
| | - Peige Fan
- Beijing Key Laboratory of Grape Science and Enology and CAS Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 PR China
| | - Wei Duan
- Beijing Key Laboratory of Grape Science and Enology and CAS Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 PR China
| | - Shaohua Li
- Beijing Key Laboratory of Grape Science and Enology and CAS Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 PR China
- University of the Chinese Academy of Sciences, Beijing, 100049 PR China
| | - Zhenchang Liang
- Beijing Key Laboratory of Grape Science and Enology and CAS Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093 PR China
- Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan, 430074 PR China
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Zang D, Wang L, Zhang Y, Zhao H, Wang Y. ThDof1.4 and ThZFP1 constitute a transcriptional regulatory cascade involved in salt or osmotic stress in Tamarix hispida. PLANT MOLECULAR BIOLOGY 2017; 94:495-507. [PMID: 28578496 DOI: 10.1007/s11103-017-0620-x] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Accepted: 05/24/2017] [Indexed: 05/03/2023]
Abstract
Identification of the upstream regulators of a gene is important to characterize the transcriptional pathway and the function of the gene. Previously, we found that a zinc finger protein (ThZFP1) is involved in abiotic stress tolerance of Tamarix hispida. In the present study, we further investigated the transcriptional pathway of ThZFP1. Dof motifs are abundant in the ThZFP1 promoter; therefore, we used them to screen for transcriptional regulators of ThZFP1. A Dof protein, ThDof1.4, binds to the Dof motif specifically, and was hypothesized as the upstream regulator of ThZFP1. Further study showed that overexpression of ThDof1.4 in T. hispida activated the expression of GUS controlled by the ThZFP1 promoter. In T. hispida, transient overexpression of ThDof1.4 increased the transcripts of ThZFP1; conversely, transient RNAi-silencing of ThDof1.4 reduced the expression of ThZFP1. Chromatin immunoprecipitation indicated that ThDof1.4 binds to the ThZFP1 promoter. Additionally, ThDof1.4 and ThZFP1 share similar expression patterns in response to salt or drought stress. Furthermore, like ThZFP1, ThDof1.4 could increase the proline level and enhance ROS scavenging capability to improve salt and osmotic stress tolerance. Together, these results suggested that ThDof1.4 and ThZFP1 form a transcriptional regulatory cascade involved in abiotic stress resistance in T. hispida.
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Affiliation(s)
- Dandan Zang
- State Key Laboratory of Forest Genetics and Tree Breeding, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China
| | - Lina Wang
- State Key Laboratory of Forest Genetics and Tree Breeding, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China
| | - Yiming Zhang
- State Key Laboratory of Forest Genetics and Tree Breeding, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China
| | - Huimin Zhao
- State Key Laboratory of Forest Genetics and Tree Breeding, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China
| | - Yucheng Wang
- State Key Laboratory of Forest Genetics and Tree Breeding, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China.
- Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Ürümqi, 830011, Xinjiang, China.
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