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Kim SC, Nusinow DA, Wang X. Identification of phospholipase Ds and phospholipid species involved in circadian clock alterations using CRISPR/Cas9-based multiplex editing of Arabidopsis. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.09.574824. [PMID: 38260301 PMCID: PMC10802401 DOI: 10.1101/2024.01.09.574824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
Reciprocal regulation between the circadian clock and lipid metabolism is emerging, but its mechanisms remain elusive. We reported that a lipid metabolite phosphatidic acid (PA) bound to the core clock transcription factors LATE ELONGATED HYPOCOTYL (LHY) and CIRCADIAN CLOCK ASSOCIATED1 (CCA1) and chemical suppression of phospholipase D (PLD)-catalyzed PA formation perturbed the clock in Arabidopsis. Here, we identified, among 12 members, specific PLDs critical to regulating clock function. We approached this using a multiplex CRISPR/Cas9 system to generate a library of plants bearing randomly mutated PLDs, then screening the mutants for altered rhythmic expression of CCA1 . All PLD s, except for β2 , were effectively edited, and the mutations were heritable. Screening of T2 plants identified some with an altered rhythm of CCA1 expression, and this trait was observed in many of their progenies. Genotyping revealed that at least two of six PLD s ( α1, α3 , γ1 , δ , ε and ζ2 ) were mutated in the clock-altered plants. Those plants also had reduced levels of PA molecular species that bound LHY and CCA1. This study identifies combinations of two or more PLDs and changes in particular phospholipid species involved in clock outputs and also suggests a functional redundancy of the six PLDs for regulating the plant circadian clock. One sentence summary This study identifies combinations of two or more phospholipase Ds involved in altering clock outputs and the specific phosphatidic acid species impacting the clock rhythms.
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Ndathe R, Kato N. Phosphatidic acid produced by phospholipase Dα1 and Dδ is incorporated into the internal membranes but not involved in the gene expression of RD29A in the abscisic acid signaling network in Arabidopsis thaliana. FRONTIERS IN PLANT SCIENCE 2024; 15:1356699. [PMID: 38681216 PMCID: PMC11045897 DOI: 10.3389/fpls.2024.1356699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Accepted: 03/21/2024] [Indexed: 05/01/2024]
Abstract
Core protein components of the abscisic acid (ABA) signaling network, pyrabactin resistance (PYR), protein phosphatases 2C (PP2C), and SNF1-related protein kinase 2 (SnRK2) are involved in the regulation of stomatal closure and gene expression downstream responses in Arabidopsis thaliana. Phosphatidic acid (PA) produced by the phospholipases Dα1 and Dδ (PLDs) in the plasma membrane has been identified as a necessary molecule in ABA-inducible stomatal closure. On the other hand, the involvement of PA in ABA-inducible gene expression has been suggested but remains a question. In this study, the involvement of PA in the ABA-inducible gene expression was examined in the model plant Arabidopsis thaliana and the canonical RD29A ABA-inducible gene that possesses a single ABA-responsive element (ABRE) in the promoter. The promoter activity and accumulation of the RD29A mRNA during ABA exposure to the plants were analyzed under conditions in which the production of PA by PLDs is abrogated through chemical and genetic modification. Changes in the subcellular localization of PA during the signal transduction were analyzed with confocal microscopy. The results obtained in this study suggest that inhibition of PA production by the PLDs does not affect the promoter activity of RD29A. PA produced by the PLDs and exogenously added PA in the plasma membrane are effectively incorporated into internal membranes to transduce the signal. However, exogenously added PA induces stomatal closure but not RD29A expression. This is because PA produced by the PLDs most likely inhibits the activity of not all but only the selected PP2C family members, the negative regulators of the RD29A promoter. This finding underscores the necessity for experimental verifications to adapt previous knowledge into a signaling network model before its construction.
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Affiliation(s)
| | - Naohiro Kato
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, United States
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Lindberg S, Premkumar A. Ion Changes and Signaling under Salt Stress in Wheat and Other Important Crops. PLANTS (BASEL, SWITZERLAND) 2023; 13:46. [PMID: 38202354 PMCID: PMC10780558 DOI: 10.3390/plants13010046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 12/14/2023] [Accepted: 12/16/2023] [Indexed: 01/12/2024]
Abstract
High concentrations of sodium (Na+), chloride (Cl-), calcium (Ca2+), and sulphate (SO42-) are frequently found in saline soils. Crop plants cannot successfully develop and produce because salt stress impairs the uptake of Ca2+, potassium (K+), and water into plant cells. Different intracellular and extracellular ionic concentrations change with salinity, including those of Ca2+, K+, and protons. These cations serve as stress signaling molecules in addition to being essential for ionic homeostasis and nutrition. Maintaining an appropriate K+:Na+ ratio is one crucial plant mechanism for salt tolerance, which is a complicated trait. Another important mechanism is the ability for fast extrusion of Na+ from the cytosol. Ca2+ is established as a ubiquitous secondary messenger, which transmits various stress signals into metabolic alterations that cause adaptive responses. When plants are under stress, the cytosolic-free Ca2+ concentration can rise to 10 times or more from its resting level of 50-100 nanomolar. Reactive oxygen species (ROS) are linked to the Ca2+ alterations and are produced by stress. Depending on the type, frequency, and intensity of the stress, the cytosolic Ca2+ signals oscillate, are transient, or persist for a longer period and exhibit specific "signatures". Both the influx and efflux of Ca2+ affect the length and amplitude of the signal. According to several reports, under stress Ca2+ alterations can occur not only in the cytoplasm of the cell but also in the cell walls, nucleus, and other cell organelles and the Ca2+ waves propagate through the whole plant. Here, we will focus on how wheat and other important crops absorb Na+, K+, and Cl- when plants are under salt stress, as well as how Ca2+, K+, and pH cause intracellular signaling and homeostasis. Similar mechanisms in the model plant Arabidopsis will also be considered. Knowledge of these processes is important for understanding how plants react to salinity stress and for the development of tolerant crops.
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Affiliation(s)
- Sylvia Lindberg
- Department of Ecology, Environment and Plant Sciences, Stockholm University, SE-114 18 Stockholm, Sweden
| | - Albert Premkumar
- Bharathiyar Group of Institutes, Guduvanchery 603202, Tamilnadu, India;
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Brazel AJ, Graciet E. Complexity of Abiotic Stress Stimuli: Mimicking Hypoxic Conditions Experimentally on the Basis of Naturally Occurring Environments. Methods Mol Biol 2023; 2642:23-48. [PMID: 36944871 DOI: 10.1007/978-1-0716-3044-0_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
Plants require oxygen to respire and produce energy. Plant cells are exposed to low oxygen levels (hypoxia) in different contexts and have evolved conserved molecular responses to hypoxia. Both environmental and developmental factors can influence intracellular oxygen concentrations. In nature, plants can experience hypoxic conditions when the soil becomes saturated with water following heavy precipitation (i.e., waterlogging). Hypoxia can also arise in specific tissues that have poor gas exchange with atmospheric oxygen. In this case, hypoxic niches that are physiologically and developmentally relevant may form. To dissect the molecular mechanisms underlying the regulation of hypoxia response in plants, a wide range of hypoxia-inducing methods have been used in the laboratory setting. Yet, the different characteristics, pros and cons of each of these hypoxia treatments are seldom compared between methods, and with natural forms of hypoxia. In this chapter, we present both environmental and developmental forms of hypoxia that plants encounter in the wild, as well as the different experimental hypoxia treatments used to mimic them in the laboratory setting, with the aim of informing on what experimental approaches might be most appropriate to the questions addressed, including stress signaling and regulation.
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Morgan SH, Kader MA, Lindberg S. Cytosolic Sodium Influx in Mesophyll Protoplasts of Arabidopsis thaliana, wt, sos1:1 and nhx1 Differs and Induces Different Calcium Changes. PLANTS (BASEL, SWITZERLAND) 2022; 11:3439. [PMID: 36559553 PMCID: PMC9780823 DOI: 10.3390/plants11243439] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 11/28/2022] [Accepted: 12/07/2022] [Indexed: 06/17/2023]
Abstract
The sodium influx into the cytosol of mesophyll protoplasts from Arabidopsis thaliana cv. Columbia, wild type, was compared with the influx into sos1-1 and nhx1 genotypes, which lack the Na+/H+ antiporter in the plasma membrane and tonoplast, respectively. Changes in cytosolic sodium and calcium concentrations upon a 100 mM NaCl addition were detected by use of epifluorescence microscopy and the sodium-specific fluorescent dye SBFI, AM, and calcium sensitive Fura 2, AM, respectively. There was a smaller and mainly transient influx of Na+ in the cytosol of the wild type compared with the sos1-1 and nhx1 genotypes, in which the influx lasted for a longer time. Sodium chloride addition to the protoplasts' medium induced a significant increase in cytosolic calcium concentration in the wild type at 1.0 mM external calcium, and to a lesser extent in nhx1, however, it was negligible in the sos1-1 genotype. LiCl inhibited the cytosolic calcium elevation in the wild type. The results suggest that the salt-induced calcium elevation in the cytosol of mesophyll cells depends on an influx from both internal and external stores and occurs in the presence of an intact Na+/H+ antiporter at the plasma membrane. The Arabidopsis SOS1 more effectively regulates sodium homeostasis than NHX1.
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Affiliation(s)
- Sherif H. Morgan
- Plant Botany Department, Faculty of Agriculture, Cairo University, Cairo 12613, Egypt
| | - Md Abdul Kader
- Department of Agronomy, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
| | - Sylvia Lindberg
- Department of Ecology, Environment and Plant Sciences, Stockholm University, SE-106 91 Stockholm, Sweden
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Wei J, Shao W, Liu X, He L, Zhao C, Yu G, Xu J. Genome-wide identification and expression analysis of phospholipase D gene in leaves of sorghum in response to abiotic stresses. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2022; 28:1261-1276. [PMID: 35910446 PMCID: PMC9334518 DOI: 10.1007/s12298-022-01200-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 06/11/2022] [Accepted: 06/13/2022] [Indexed: 06/03/2023]
Abstract
Abiotic stress caused by unsuitable environmental changes brings serious impacts on the growth and development of sorghum, resulting in significant loss in yield and quality every year. Phospholipase D is one of the key enzymes that catalyze the hydrolysis of phospholipids, and participates in plants response to abiotic stresses and phytohormones, whereas as the main producers of Phosphatidic acid (PA) signal, the detailed information about Phospholipase D associated (SbPLD) family in sorghum has been rarely reported. This study was performed to identify the PLD family gene in sorghum based on the latest genome annotation and to determine the expression of PLDs under abiotic stresses by qRT-PCR analysis. In this study, 13 PLD genes were identified in sorghum genome and further divided into 7 groups according to the phylogenetic analysis. All sorghum PLD family members harbored two conserved domains (HDK1&2) with catalytic activity, and most members contained a C2 domain. In ζ subfamily, C2 domain was replaced by PX and PH domain. The exon-intron structure of SbPLD genes within the same subfamily was highly conservative. The tissue specific expression analysis revealed different expression of SbPLD genes in various developmental stages. High level expression of SbPLDα3 was observed in almost all tissues, whereas SbPLDα4 was mainly expressed in roots. Under abiotic stress conditions, SbPLD genes responded actively to NaCl, ABA, drought (PEG) and cold (4 °C) treatment at the transcriptional level. The expression of SbPLDβ1 was significantly up-regulated, while the transcription of SbPLDζ was suppressed under various stress conditions. In addition, SbPLDβ1 and SbPLDδ2 were predicted to be the target genes of sbi-miR159 and sbi-miR167, respectively. This study will help to decipher the roles of PLDs in sorghum growth and abiotic stress responses. Supplementary Information The online version contains supplementary material available at 10.1007/s12298-022-01200-9.
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Affiliation(s)
- Jinpeng Wei
- Key Lab of Modern Agricultural Cultivation and Crop Germplasm Improvement of Heilongjiang Province, Heilongjiang Engineering Technology Research Center for Crop Straw Utilization, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing, 163319 China
- Ministry of Agriculture and Rural Affairs Agro-Products and Processed Products Quality Supervision, Inspection and Testing Center, Daqing, 163319 China
- National Coarse Cereal Engineering Research Center, Daqing, 163319 China
| | - Wenjing Shao
- Key Lab of Modern Agricultural Cultivation and Crop Germplasm Improvement of Heilongjiang Province, Heilongjiang Engineering Technology Research Center for Crop Straw Utilization, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing, 163319 China
| | - Xinyu Liu
- Key Lab of Modern Agricultural Cultivation and Crop Germplasm Improvement of Heilongjiang Province, Heilongjiang Engineering Technology Research Center for Crop Straw Utilization, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing, 163319 China
| | - Lin He
- Key Lab of Modern Agricultural Cultivation and Crop Germplasm Improvement of Heilongjiang Province, Heilongjiang Engineering Technology Research Center for Crop Straw Utilization, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing, 163319 China
| | - Changjiang Zhao
- Key Lab of Modern Agricultural Cultivation and Crop Germplasm Improvement of Heilongjiang Province, Heilongjiang Engineering Technology Research Center for Crop Straw Utilization, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing, 163319 China
| | - Gaobo Yu
- College of Horticulture and Landscape, Heilongjiang Bayi Agricultural University, Daqing, 163319 China
| | - Jingyu Xu
- Key Lab of Modern Agricultural Cultivation and Crop Germplasm Improvement of Heilongjiang Province, Heilongjiang Engineering Technology Research Center for Crop Straw Utilization, College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing, 163319 China
- National Coarse Cereal Engineering Research Center, Daqing, 163319 China
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Global Identification and Characterization of C2 Domain-Containing Proteins Associated with Abiotic Stress Response in Rice (Oryza sativa L.). Int J Mol Sci 2022; 23:ijms23042221. [PMID: 35216337 PMCID: PMC8875736 DOI: 10.3390/ijms23042221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 02/14/2022] [Accepted: 02/15/2022] [Indexed: 11/20/2022] Open
Abstract
C2 domain-containing proteins (C2DPs) have been identified in different genomes that contain single or multiple C2 domains in their C- or N-terminal. It possesses higher functional activity in the transmembrane regions. The identification of C2 domains were reported in a previous study, such as multiple C2 domains and transmembrane-region proteins (MCTPs) and N-terminal-TM-C2 domain proteins (NTMC2s) of rice, Arabidopsis thaliana, and cotton, whereas the C2DP gene family in rice has not been comprehensively studied, and the role of the C2DP gene in rice in response to abiotic stress is not yet fully understood. In this study, we identified 82 C2DPs in the rice genome and divided them into seven groups through phylogenetic analysis. The synteny analysis revealed that duplication events were either exhibited within the genome of rice or between the genomes of rice and other species. Through the analysis of cis-acting elements in promoters, expression profiles, and qRT-PCR results, the functions of OsC2DPs were found to be widely distributed in diverse tissues and were extensively involved in phytohormones-related and abiotic stresses response in rice. The prediction of the microRNA (miRNA) targets of OsC2DPs revealed the possibility of regulation by consistent miRNAs. Notably, OsC2DP50/51/52 as a co-tandem duplication exhibited similar expression variations and involved the coincident miRNA-regulation pathway. Moreover, the results of the genotypic variation and haplotype analysis revealed that OsC2DP17, OsC2DP29, and OsC2DP49 were associated with cold stress responses. These findings provided comprehensive insights for characterizations of OsC2DPs in rice as well as for their roles for abiotic stress.
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León J, Castillo MC, Gayubas B. The hypoxia-reoxygenation stress in plants. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:5841-5856. [PMID: 33367851 PMCID: PMC8355755 DOI: 10.1093/jxb/eraa591] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 12/16/2020] [Indexed: 05/04/2023]
Abstract
Plants are very plastic in adapting growth and development to changing adverse environmental conditions. This feature will be essential for plants to survive climate changes characterized by extreme temperatures and rainfall. Although plants require molecular oxygen (O2) to live, they can overcome transient low-O2 conditions (hypoxia) until return to standard 21% O2 atmospheric conditions (normoxia). After heavy rainfall, submerged plants in flooded lands undergo transient hypoxia until water recedes and normoxia is recovered. The accumulated information on the physiological and molecular events occurring during the hypoxia phase contrasts with the limited knowledge on the reoxygenation process after hypoxia, which has often been overlooked in many studies in plants. Phenotypic alterations during recovery are due to potentiated oxidative stress generated by simultaneous reoxygenation and reillumination leading to cell damage. Besides processes such as N-degron proteolytic pathway-mediated O2 sensing, or mitochondria-driven metabolic alterations, other molecular events controlling gene expression have been recently proposed as key regulators of hypoxia and reoxygenation. RNA regulatory functions, chromatin remodeling, protein synthesis, and post-translational modifications must all be studied in depth in the coming years to improve our knowledge on hypoxia-reoxygenation transition in plants, a topic with relevance in agricultural biotechnology in the context of global climate change.
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Affiliation(s)
- José León
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas – Universidad Politécnica de Valencia), Valencia, Spain
- Correspondence:
| | - Mari Cruz Castillo
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas – Universidad Politécnica de Valencia), Valencia, Spain
| | - Beatriz Gayubas
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas – Universidad Politécnica de Valencia), Valencia, Spain
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Sagar S, Deepika, Biswas DK, Chandrasekar R, Singh A. Genome-wide identification, structure analysis and expression profiling of phospholipases D under hormone and abiotic stress treatment in chickpea (Cicer arietinum). Int J Biol Macromol 2020; 169:264-273. [PMID: 33338528 DOI: 10.1016/j.ijbiomac.2020.12.102] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 12/09/2020] [Accepted: 12/13/2020] [Indexed: 12/19/2022]
Abstract
Phospholipases D (PLDs) are phospholipid hydrolyzing enzymes and crucial components of lipid signaling in plants. PLDs are implicated in stress responses in different plants however, characterization of PLDs in chickpea is missing. Here, we identify 13 PLD genes in the chickpea genome. PLD family could be divided into α, β, δ, ε and ζ isoforms based on sequence and structure. Protein remodeling described that chickpea PLDs are composed of defined arrangements of α-helix, β-sheets and short loops. Phylogenetic analysis suggested evolutionary conservation of chickpea PLD family with dicots. In-planta subcellular localization showed the plasma membrane localization of chickpea PLDs. All PLD promoters had hormone and stress related cis-regulatory elements, which suggested overlapping function of PLDs in hormone and abiotic stress signaling. The qRT-PCR expression analysis revealed that most PLD genes are differentially expressed in multiple abiotic stresses (drought, salt and cold stress). Moreover, several PLD genes had overlapping expression in abiotic stress and ABA and JA treatment. These observations indicate the involvement of PLD gene family in cross-talk of phytohormone and abiotic stress signaling in chickpea. Thus, present study opens new avenues of utilizing PLD related information for understanding hormone-regulated abiotic stress signaling in legume crops.
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Affiliation(s)
- Sushma Sagar
- National Institute of Plant Genome Research, New Delhi 110067, India
| | - Deepika
- National Institute of Plant Genome Research, New Delhi 110067, India
| | | | | | - Amarjeet Singh
- National Institute of Plant Genome Research, New Delhi 110067, India.
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Xie LJ, Zhou Y, Chen QF, Xiao S. New insights into the role of lipids in plant hypoxia responses. Prog Lipid Res 2020; 81:101072. [PMID: 33188800 DOI: 10.1016/j.plipres.2020.101072] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 09/25/2020] [Accepted: 11/08/2020] [Indexed: 12/21/2022]
Abstract
In plants, hypoxia (low-oxygen stress) is induced by soil waterlogging or submergence and this major abiotic stress has detrimental effects on plant growth, development, distribution, and productivity. To survive low-oxygen stress, plants have evolved a set of morphological, physiological, and biochemical adaptations. These adaptations integrate metabolic acclimation and signaling networks allowing plants to endure or escape from low-oxygen environments by altering their metabolism and growth. Lipids are ubiquitously involved in regulating plant responses to hypoxia and post-hypoxic reoxygenation. In particular, the polyunsaturation of long-chain acyl-CoAs regulates hypoxia sensing in plants by modulating acyl-CoA-binding protein-Group VII ethylene response factor dynamics. Moreover, unsaturated very-long-chain ceramide species protect plants from hypoxia-induced cellular damage by regulating the kinase activity of CONSTITUTIVE TRIPLE RESPONSE1 in the ethylene signaling pathway. Finally, the oxylipin jasmonate specifically regulates plant responses to reoxygenation stress by transcriptionally modulating antioxidant biosynthesis. Here we provide an overview of the roles of lipid remodeling and signaling in plant responses to hypoxia/reoxygenation and their effects on the downstream events affecting plant survival. In addition, we highlight the key remaining challenges in this important field.
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Affiliation(s)
- Li-Juan Xie
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
| | - Ying Zhou
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Qin-Fang Chen
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China.
| | - Shi Xiao
- State Key Laboratory of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China.
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