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Cheeseman JM. The evolution of halophytes, glycophytes and crops, and its implications for food security under saline conditions. THE NEW PHYTOLOGIST 2015; 206:557-70. [PMID: 25495078 DOI: 10.1111/nph.13217] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Accepted: 11/12/2014] [Indexed: 05/09/2023]
Abstract
The effective development of salt tolerant crops requires an understanding that the evolution of halophytes, glycophytes and our major grain crops has involved significantly different processes. Halophytes (and other edaphic endemics) generally arose through colonization of habitats in severe disequilibrium by pre-adapted individuals, rather than by gradual adaptation from populations of 'glycophytes'. Glycophytes, by contrast, occur in low sodium ecosystems, where sodium was and is the major limiting nutrient in herbivore diets, suggesting that their evolution reflects the fact that low sodium individuals experienced lower herbivory and had higher fitness. For domestication/evolution of crop plants, the selective pressure was human imposed and involved humans co-opting functions of defense and reproductive security. Unintended consequences of this included loss of tolerance to various stresses and loss of the genetic variability needed to correct that. Understanding, combining and manipulating all three modes of evolution are now critical to the development of salt tolerant crops, particularly those that will offer food security in countries with few economic resources and limited infrastructure. Such efforts will require exploiting the genetic structures of recently evolved halophytes, the genetic variability of model plants, and endemic halophytes and 'minor' crops that already exist.
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Affiliation(s)
- John M Cheeseman
- Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
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Yadav NS, Singh VK, Singh D, Jha B. A novel gene SbSI-2 encoding nuclear protein from a halophyte confers abiotic stress tolerance in E. coli and tobacco. PLoS One 2014; 9:e101926. [PMID: 24999628 PMCID: PMC4084957 DOI: 10.1371/journal.pone.0101926] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Accepted: 06/13/2014] [Indexed: 01/05/2023] Open
Abstract
Salicornia brachiata is an extreme halophyte that grows luxuriantly in coastal marshes. Previously, we have reported isolation and characterization of ESTs from Salicornia with large number of novel/unknown salt-responsive gene sequences. In this study, we have selected a novel salt-inducible gene SbSI-2 (Salicornia brachiata salt-inducible-2) for functional characterization. Bioinformatics analysis revealed that SbSI-2 protein has predicted nuclear localization signals and a strong protein-protein interaction domain. Transient expression of the RFP:SbSI2 fusion protein confirmed that SbSI-2 is a nuclear-localized protein. Genomic organization study showed that SbSI-2 is intronless and has a single copy in Salicornia genome. Quantitative RT-PCR analysis revealed higher SbSI-2 expression under salt stress and desiccation conditions. The SbSI-2 gene was transformed in E. coli and tobacco for functional characterization. pET28a-SbSI-2 recombinant E. coli cells showed higher tolerance to desiccation and salinity compared to vector alone. Transgenic tobacco plants overexpressing SbSI-2 have improved salt- and osmotic tolerance, accompanied by better growth parameters, higher relative water content, elevated accumulation of compatible osmolytes, lower Na+ and ROS accumulation and lesser electrolyte leakage than the wild-type. Overexpression of the SbSI-2 also enhanced transcript levels of ROS-scavenging genes and some stress-related transcription factors under salt and osmotic stresses. Taken together, these results demonstrate that SbSI-2 might play an important positive modulation role in abiotic stress tolerance. This identifies SbSI-2 as a novel determinant of salt/osmotic tolerance and suggests that it could be a potential bioresource for engineering abiotic stress tolerance in crop plants.
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Affiliation(s)
- Narendra Singh Yadav
- Discipline of Marine Biotechnology and Ecology, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
| | - Vijay Kumar Singh
- Discipline of Marine Biotechnology and Ecology, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
| | - Dinkar Singh
- Discipline of Marine Biotechnology and Ecology, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
| | - Bhavanath Jha
- Discipline of Marine Biotechnology and Ecology, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
- Academy of Scientific and Innovative Research, CSIR, New Delhi, India
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Ma J, Zhang M, Xiao X, You J, Wang J, Wang T, Yao Y, Tian C. Global transcriptome profiling of Salicornia europaea L. shoots under NaCl treatment. PLoS One 2013; 8:e65877. [PMID: 23825526 PMCID: PMC3692491 DOI: 10.1371/journal.pone.0065877] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Accepted: 04/29/2013] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Soil salinity is a major abiotic stress that limits agriculture productivity worldwide. Salicornia europaea is well adapted to extreme saline environments with more than 1,000 mM NaCl in the soil, so it could serve as an important model species for studying halophilic mechanisms in euhalophytes. To obtain insights into the molecular basis of salt tolerance, we present here the first extensive transcriptome analysis of this species using the Illumina HiSeq™ 2000. PRINCIPAL FINDINGS A total of 41 and 39 million clean reads from the salt-treated (Se200S) and salt-free (SeCKS) tissues of S. europaea shoots were obtained, and de novo assembly produced 97,865 and 101,751 unigenes, respectively. Upon further assembly with EST data from both Se200S and SeCKS, 109,712 high-quality non-redundant unigenes were generated with a mean unigene size of 639 bp. Additionally, a total of 3,979 differentially expressed genes (DEGs) were detected between the Se200S and SeCKS libraries, with 348 unigenes solely expressed in Se200S and 460 unigenes solely expressed in SeCKS. Furthermore, we identified a large number of genes that are involved in ion homeostasis and osmotic adjustment, including cation transporters and proteins for the synthesis of low-molecular compounds. All unigenes were functionally annotated within the COG, GO and KEGG pathways, and 10 genes were validated by qRT-PCR. CONCLUSION Our data contains the extensive sequencing and gene-annotation analysis of S. europaea. This genetic knowledge will be very useful for future studies on the molecular adaptation to abiotic stress in euhalophytes and will facilitate the genetic manipulation of other economically important crops.
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Affiliation(s)
- Jinbiao Ma
- Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi, China
| | - Meiru Zhang
- Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xinlong Xiao
- Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Jinjin You
- Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi, China
| | - Junru Wang
- Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Tao Wang
- College of Resource and Environment Science, Xinjiang University, Urumqi, China
| | - Yinan Yao
- Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi, China
- * E-mail: (YY); (CT)
| | - Changyan Tian
- Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi, China
- * E-mail: (YY); (CT)
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Oh DH, Dassanayake M, Bohnert HJ, Cheeseman JM. Life at the extreme: lessons from the genome. Genome Biol 2012; 13:241. [PMID: 22390828 DOI: 10.1186/gb-2012-13-3-241] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Extremophile plants thrive in places where most plant species cannot survive. Recent developments in high-throughput technologies and comparative genomics are shedding light on the evolutionary mechanisms leading to their adaptation.
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Affiliation(s)
- Dong-Ha Oh
- Department of Plant Biology, University of Illinois at Urbana-Champaign, 61801, USA
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Oh DH, Dassanayake M, Bohnert HJ, Cheeseman JM. Life at the extreme: lessons from the genome. Genome Biol 2012. [DOI: 10.1186/gb4003] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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Jamil A, Riaz S, Ashraf M, Foolad MR. Gene Expression Profiling of Plants under Salt Stress. CRITICAL REVIEWS IN PLANT SCIENCES 2011; 30:435-458. [PMID: 0 DOI: 10.1080/07352689.2011.605739] [Citation(s) in RCA: 228] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
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Yadav NS, Rashmi D, Singh D, Agarwal PK, Jha B. A novel salt-inducible gene SbSI-1 from Salicornia brachiata confers salt and desiccation tolerance in E. coli. Mol Biol Rep 2011; 39:1943-8. [PMID: 21655957 DOI: 10.1007/s11033-011-0941-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2011] [Accepted: 05/26/2011] [Indexed: 11/27/2022]
Abstract
Salicornia brachiata is one of the extreme salt tolerant plants and grows luxuriantly in coastal areas. Previously we have reported isolation and characterization of ESTs from S. brachiata with large number of unknown gene sequences. Reverse Northern analysis showed upregulation and downregulation of few unknown genes in response to salinity. Some of these unknown genes were made full length and their functional analysis is being tested. In this study, we have selected a novel unknown salt inducible gene SbSI-1 (Salicornia brachiata salt inducible-1) for the functional validation. The SbSI-1 (Gen-Bank accession number JF 965339) was made full length and characterized in detail for its functional validation under desiccation and salinity. The SbSI-1 gene is 917 bp long, and contained 437 bp 3' UTR, and 480 bp ORF region encoding 159 amino acids protein with estimated molecular mass of 18.39 kDa and pI 8.58. The real time PCR analysis revealed high transcript expression in salt, desiccation, cold and heat stresses. However, the maximum expression was obtained by desiccation. The ORF region of SbSI-1 was cloned in pET28a vector and transformed in BL21 (DE3) E. coli cells. The SbSI-1 recombinant E. coli cells showed tolerance to desiccation and salinity stress compared to only vector in the presence of stress.
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Affiliation(s)
- Narendra Singh Yadav
- Discipline of Marine Biotechnology and Ecology, Central Salt and Marine Chemicals Research Institute (Council of Scientific and Industrial Research), G. B. Marg, Bhavnagar 364 021, Gujarat, India
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Wang Y, Ma H, Liu G, Zhang D, Ban Q, Zhang G, Xu C, Yang C. Generation and analysis of expressed sequence tags from a NaHCO3-treated Limonium bicolor cDNA library. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2008; 46:977-986. [PMID: 18640047 DOI: 10.1016/j.plaphy.2008.06.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2007] [Revised: 06/01/2008] [Accepted: 06/03/2008] [Indexed: 05/26/2023]
Abstract
Limonium bicolor, a halophytic species of Plumbaginaceae, can thrive in saline or saline-alkali (sodic) soil, demonstrating that it has developed an efficient saline-alkali resistance system, and is an ideal material for the study of saline-alkali tolerance. In order to identify and characterize the complexity of this adaptation, expressed sequence tags (ESTs) analysis and real-time reverse transcriptase-polymerase chain reaction (RT-PCR) were conducted. We constructed a cDNA library of L. bicolor exposed to 0.4M NaHCO3 for 48h, and obtained 2358 ESTs, representing 1735 unique genes. A BLASTX search revealed that 1393 ESTs, representing 873 unique genes, showed significant similarity (E-values <10(-4)) to protein sequences in the non-redundant database. These ESTs were further grouped into 12 functional categories according to their functional annotation. The most abundant categories were metabolism (18.74%), photosynthesis (14.86%), unknown classification (12.20%), defense (12.20%), and transport facilitation (10.19%). In total, 286 putative abiotic stress related transcripts, representing 121 unique genes, were identified. Among them, the two most abundant genes encoded metallothionein (EH794553) and lipid transfer protein (EH794695), each of which accounted for 1.4% of the total ESTs. The expression of 18 putative stress-related genes were further analyzed in roots and leaves of L. bicolor using real-time RT-PCR, and 14 genes were differentially expressed by more than 2-fold as a result of the NaHCO3 stress. The results of this study may contribute to our understanding of the molecular mechanism of saline-alkali tolerance in L. bicolor.
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Affiliation(s)
- Yucheng Wang
- School of Forestry, Northeast Forestry University, 26 Hexing Road, Harbin 150040, PR China
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Abstract
Halophytes, plants that survive to reproduce in environments where the salt concentration is around 200 mm NaCl or more, constitute about 1% of the world's flora. Some halophytes show optimal growth in saline conditions; others grow optimally in the absence of salt. However, the tolerance of all halophytes to salinity relies on controlled uptake and compartmentalization of Na+, K+ and Cl- and the synthesis of organic 'compatible' solutes, even where salt glands are operative. Although there is evidence that different species may utilize different transporters in their accumulation of Na+, in general little is known of the proteins and regulatory networks involved. Consequently, it is not yet possible to assign molecular mechanisms to apparent differences in rates of Na+ and Cl- uptake, in root-to-shoot transport (xylem loading and retrieval), or in net selectivity for K+ over Na+. At the cellular level, H+-ATPases in the plasma membrane and tonoplast, as well as the tonoplast H+-PPiase, provide the trans-membrane proton motive force used by various secondary transporters. The widespread occurrence, taxonomically, of halophytes and the general paucity of information on the molecular regulation of tolerance mechanisms persuade us that research should be concentrated on a number of 'model' species that are representative of the various mechanisms that might be involved in tolerance.
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Affiliation(s)
- Timothy J Flowers
- School of Life Sciences, University of Sussex, Falmer, Brighton, Sussex, BN1 9QG, UK
- School of Plant Biology, Faculty of Natural and Agricultural Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia
| | - Timothy D Colmer
- School of Plant Biology, Faculty of Natural and Agricultural Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia
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