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Khan NZ, Ali A, Ali W, Aasim M, Khan T, Khan Z, Munir I. Heterologous expression of bacterial dehydrin gene in Arabidopsis thaliana promotes abiotic stress tolerance. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2023; 29:1239-1246. [PMID: 38024953 PMCID: PMC10678877 DOI: 10.1007/s12298-023-01358-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 08/30/2023] [Accepted: 08/31/2023] [Indexed: 12/01/2023]
Abstract
Salinity, low temperature, and drought are major environmental factors in agriculture leading to reduced crop yield. Dehydrins (DHNs) are induced transcriptionally during cellular dehydration and accumulate in different tissues during abiotic stresses. Here we isolated and characterized a bacterial gene BG757 in Arabidopsis, encoding a putative dehydrin type protein. ABA induces the expression of various dehydrins in plants, therefore, to elucidate the potential role, ABA sensitivity was examined in Arabidopsis transgenic lines expressing BG757. Interestingly, BG757-expressing plants showed hypersensitivity towards NaCl and ABA during seed germination. In addition to germination, BG757-expressing plants also showed root growth retardation in the presence of ABA and NaCl when compared with wild type (WT), suggesting that BG757 positively regulate salt stress and ABA response. Furthermore, BG757-expressing plants showed significant drought tolerance compared with WT. Consistent with drought tolerance, expression levels of stress inducible genes (DREB2A, RD22, RD26, LEA7 and SOS1) were strongly upregulated in transgenic plants compared with WT. All together these results suggest that heterologous expression of bacterial gene, BG757 in plants promotes resistance to environmental stresses. Supplementary Information The online version contains supplementary material available at 10.1007/s12298-023-01358-w.
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Affiliation(s)
- Nadir Zaman Khan
- Department of Biotechnology, University of Malakand, Chakdara, Pakistan
| | - Akhtar Ali
- Department of Biomedical Science and Engineering, Konkuk University, Seoul, 05029 South Korea
- Department Molecular Stress Physiology, Center of Plant Systems Biology and Biotechnology, 4000 Plovdiv, Bulgaria
| | - Waqar Ali
- Institute of Biotechnology and Genetic Engineering, The University of Agriculture Peshawar, Peshawar, Pakistan
| | - Muhammad Aasim
- Department of Biotechnology, University of Malakand, Chakdara, Pakistan
| | - Tariq Khan
- Department of Biotechnology, University of Malakand, Chakdara, Pakistan
| | - Zaryab Khan
- Department of Biotechnology, University of Malakand, Chakdara, Pakistan
| | - Iqbal Munir
- Institute of Biotechnology and Genetic Engineering, The University of Agriculture Peshawar, Peshawar, Pakistan
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Insights into the molecular aspects of salt stress tolerance in mycorrhizal plants. World J Microbiol Biotechnol 2022; 38:253. [DOI: 10.1007/s11274-022-03440-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Accepted: 10/13/2022] [Indexed: 11/16/2022]
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Singh M, Nara U. Genetic insights in pearl millet breeding in the genomic era: challenges and prospects. PLANT BIOTECHNOLOGY REPORTS 2022; 17:15-37. [PMID: 35692233 PMCID: PMC9169599 DOI: 10.1007/s11816-022-00767-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 04/30/2022] [Accepted: 05/17/2022] [Indexed: 05/28/2023]
Abstract
Pearl millet, a vital staple food and an important cereal, is emerging as crop having various end-uses as feed, food as well as fodder. Advancement in high-throughput sequencing technology has boosted up pearl millet genomic research in past few years. The available draft genome of pearl millet providing an insight into the advancement of several breeding lines. Comparative and functional genomics have untangled several loci and genes regulating adaptive and agronomic traits in pearl millet. Additionally, the knowledge achieved has far away from being applicable in real breeding practices. We believe that the best path ahead is to adopt genome-based approaches for tailored designing of pearl millet as multi-functional crop with outstanding agronomic traits for various end uses. Presently review highlight several novel concepts and techniques in crop breeding, and summarize the recent advances in pearl millet genomic research, peculiarly genome-wide association dissections of several novel alleles and genes for agronomically important traits.
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Affiliation(s)
- Mandeep Singh
- Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, Punjab 141004 India
| | - Usha Nara
- Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, Punjab 141004 India
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Palakolanu SR, Gupta S, Yeshvekar RK, Chakravartty N, Kaliamoorthy S, Shankhapal AR, Vempati AS, Kuriakose B, Lekkala SP, Philip M, Perumal RC, Lachagari VBR, Bhatnagar-Mathur P. Genome-wide miRNAs profiles of pearl millet under contrasting high vapor pressure deficit reveal their functional roles in drought stress adaptations. PHYSIOLOGIA PLANTARUM 2022; 174:e13521. [PMID: 34392545 DOI: 10.1111/ppl.13521] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 07/22/2021] [Accepted: 08/04/2021] [Indexed: 06/13/2023]
Abstract
Pearl millet (Pennisetum glaucum [L.] R. Br.) is an important crop capable of growing in harsh and marginal environments, with the highest degree of tolerance to drought and heat stresses among cereals. Diverse germplasm of pearl millet shows a significant phenotypic variation in response to abiotic stresses, making it a unique model to study the mechanisms responsible for stress mitigation. The present study focuses on identifying the physiological response of two pearl millet high-resolution cross (HRC) genotypes, ICMR 1122 and ICMR 1152, in response to low and high vapor pressure deficit (VPD). Under high VPD conditions, ICMR 1152 exhibited a lower transpiration rate (Tr), higher transpiration efficiency, and lower root sap exudation than ICMR 1122. Further, Pg-miRNAs expressed in the contrasting genotypes under low and high VPD conditions were identified by deep sequencing analysis. A total of 116 known and 61 novel Pg-miRNAs were identified from ICMR 1152, while 26 known and six novel Pg-miRNAs were identified from ICMR 1122 genotypes, respectively. While Pg-miR165, 168, 170, and 319 families exhibited significant differential expression under low and high VPD conditions in both genotypes, ICMR 1152 showed abundant expression of Pg-miR167, Pg-miR172, Pg-miR396 Pg-miR399, Pg-miR862, Pg-miR868, Pg-miR950, Pg-miR5054, and Pg-miR7527 indicating their direct and indirect role in root physiology and abiotic stress responses. Drought responsive Pg-miRNA targets showed upregulation in response to high VPD stress, further narrowing down the miRNAs involved in regulation of drought tolerance in pearl millet.
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Affiliation(s)
- Sudhakar Reddy Palakolanu
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana, India
| | - Saurabh Gupta
- AgriGenome Labs Pvt. Ltd, Hyderabad, Telangana, India
| | - Richa K Yeshvekar
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana, India
- Centre for Plant Sciences, School of Biology, University of Leeds, Leeds, UK
| | | | - Sivasakthi Kaliamoorthy
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana, India
| | | | - Ashwini Soumya Vempati
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana, India
| | | | | | | | | | | | - Pooja Bhatnagar-Mathur
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana, India
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Abdul Aziz M, Sabeem M, Mullath SK, Brini F, Masmoudi K. Plant Group II LEA Proteins: Intrinsically Disordered Structure for Multiple Functions in Response to Environmental Stresses. Biomolecules 2021; 11:1662. [PMID: 34827660 PMCID: PMC8615533 DOI: 10.3390/biom11111662] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 11/01/2021] [Accepted: 11/04/2021] [Indexed: 11/16/2022] Open
Abstract
In response to various environmental stresses, plants have evolved a wide range of defense mechanisms, resulting in the overexpression of a series of stress-responsive genes. Among them, there is certain set of genes that encode for intrinsically disordered proteins (IDPs) that repair and protect the plants from damage caused by environmental stresses. Group II LEA (late embryogenesis abundant) proteins compose the most abundant and characterized group of IDPs; they accumulate in the late stages of seed development and are expressed in response to dehydration, salinity, low temperature, or abscisic acid (ABA) treatment. The physiological and biochemical characterization of group II LEA proteins has been carried out in a number of investigations because of their vital roles in protecting the integrity of biomolecules by preventing the crystallization of cellular components prior to multiple stresses. This review describes the distribution, structural architecture, and genomic diversification of group II LEA proteins, with some recent investigations on their regulation and molecular expression under various abiotic stresses. Novel aspects of group II LEA proteins in Phoenix dactylifera and in orthodox seeds are also presented. Genome-wide association studies (GWAS) indicated a ubiquitous distribution and expression of group II LEA genes in different plant cells. In vitro experimental evidence from biochemical assays has suggested that group II LEA proteins perform heterogenous functions in response to extreme stresses. Various investigations have indicated the participation of group II LEA proteins in the plant stress tolerance mechanism, spotlighting the molecular aspects of group II LEA genes and their potential role in biotechnological strategies to increase plants' survival in adverse environments.
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Affiliation(s)
- Mughair Abdul Aziz
- Integrative Agriculture Department, College of Agriculture and Veterinary Medicine, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (M.A.A.); (M.S.)
| | - Miloofer Sabeem
- Integrative Agriculture Department, College of Agriculture and Veterinary Medicine, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (M.A.A.); (M.S.)
| | - Sangeeta Kutty Mullath
- Department of Vegetable Science, College of Agriculture, Kerala Agricultural University, Thrissur 680656, India;
| | - Faical Brini
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS), University of Sfax, B.P 1177, Sfax 3018, Tunisia;
| | - Khaled Masmoudi
- Integrative Agriculture Department, College of Agriculture and Veterinary Medicine, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (M.A.A.); (M.S.)
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Satyavathi CT, Ambawat S, Khandelwal V, Srivastava RK. Pearl Millet: A Climate-Resilient Nutricereal for Mitigating Hidden Hunger and Provide Nutritional Security. FRONTIERS IN PLANT SCIENCE 2021; 12:659938. [PMID: 34589092 PMCID: PMC8475763 DOI: 10.3389/fpls.2021.659938] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 08/03/2021] [Indexed: 06/03/2023]
Abstract
Pearl millet [Pennisetum glaucum (L.) R. Br.] is the sixth most important cereal crop after rice, wheat, maize, barley and sorghum. It is widely grown on 30 million ha in the arid and semi-arid tropical regions of Asia and Africa, accounting for almost half of the global millet production. Climate change affects crop production by directly influencing biophysical factors such as plant and animal growth along with the various areas associated with food processing and distribution. Assessment of the effects of global climate changes on agriculture can be helpful to anticipate and adapt farming to maximize the agricultural production more effectively. Pearl millet being a climate-resilient crop is important to minimize the adverse effects of climate change and has the potential to increase income and food security of farming communities in arid regions. Pearl millet has a deep root system and can survive in a wide range of ecological conditions under water scarcity. It has high photosynthetic efficiency with an excellent productivity and growth in low nutrient soil conditions and is less reliant on chemical fertilizers. These attributes have made it a crop of choice for cultivation in arid and semi-arid regions of the world; however, fewer efforts have been made to study the climate-resilient features of pearl millet in comparison to the other major cereals. Several hybrids and varieties of pearl millet were developed during the past 50 years in India by both the public and private sectors. Pearl millet is also nutritionally superior and rich in micronutrients such as iron and zinc and can mitigate malnutrition and hidden hunger. Inclusion of minimum standards for micronutrients-grain iron and zinc content in the cultivar release policy-is the first of its kind step taken in pearl millet anywhere in the world, which can lead toward enhanced food and nutritional security. The availability of high-quality whole-genome sequencing and re-sequencing information of several lines may aid genomic dissection of stress tolerance and provide a good opportunity to further exploit the nutritional and climate-resilient attributes of pearl millet. Hence, more efforts should be put into its genetic enhancement and improvement in inheritance to exploit it in a better way. Thus, pearl millet is the next-generation crop holding the potential of nutritional richness and the climate resilience and efforts must be targeted to develop nutritionally dense hybrids/varieties tolerant to drought using different omics approaches.
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Affiliation(s)
- C. Tara Satyavathi
- Indian Council of Agricultural Research - All India Coordinated Research Project on Pearl Millet, Jodhpur, India
| | - Supriya Ambawat
- Indian Council of Agricultural Research - All India Coordinated Research Project on Pearl Millet, Jodhpur, India
| | - Vikas Khandelwal
- Indian Council of Agricultural Research - All India Coordinated Research Project on Pearl Millet, Jodhpur, India
| | - Rakesh K. Srivastava
- Department of Molecular Breeding (Genomics Trait Discovery), International Crops Research Institute for Semi-arid Tropics, Patancheru, India
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Tiwari P, Chakrabarty D. Dehydrin in the past four decades: From chaperones to transcription co-regulators in regulating abiotic stress response. CURRENT RESEARCH IN BIOTECHNOLOGY 2021. [DOI: 10.1016/j.crbiot.2021.07.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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Almeida MCRD, Leite MLDMV, Souza LSBD, Simões VJLP, Pessoa LGM, Lucena LRRD, Cruz MGD, Sá Júnior EHD. Agronomic characteristics of the Pennisetum glaucum submitted to water and saline stresses. ACTA SCIENTIARUM: ANIMAL SCIENCES 2020. [DOI: 10.4025/actascianimsci.v43i1.50468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Agricultural production in semi-arid regions is limited due to water availability. In addition, the water quality available for irrigation is often compromised due to the high salt content present. Millet is a forage species considered tolerant to water deficit and moderately salt tolerant. In view of the above, the objective was to evaluate the growth of millet under water and saline stress associates. The experiment was carried out in a randomized block design, in a 4x3 factorial scheme, composed of four levels of water replacement, based on crop evapotranspiration (ETc): 25%.ETc, 50%.ETc, 75%.ETc and 100%.ETc and three levels of water salinity (0.03, 2.0 and 4.0 dS m-1). With 25%.ETc independent of salinity, all morphological characteristics of millet were affected, occurring death of plants in the initial growth phase. In the absence of salt and greater availability of water, greater plant growth occurred. With respect to salinity, there was a reduction in the increment of all variables evaluated, with the highest reduction at the highest saline level (4.0 dS m-1). Water and salt stresses, when associated, reduce the growth of millet, since concentrations above 2.0 dS m-1 and less than 50%.ETc compromise its full development, providing declines in yield.
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Kummari D, Bhatnagar-Mathur P, Sharma KK, Vadez V, Palakolanu SR. Functional characterization of the promoter of pearl millet heat shock protein 10 (PgHsp10) in response to abiotic stresses in transgenic tobacco plants. Int J Biol Macromol 2020; 156:103-110. [PMID: 32294498 DOI: 10.1016/j.ijbiomac.2020.04.069] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 04/08/2020] [Accepted: 04/09/2020] [Indexed: 11/16/2022]
Abstract
In the present study, the promoter region of the pearl millet heat shock protein 10 (PgHsp10) gene was cloned and characterized. The PgHsp10 promoter (PgHsp10pro) sequence region has all the cis-motifs required for tissue and abiotic stress inducibility. The complete PgHsp10pro (PgHsp10PC) region and a series of 5' truncations of PgHsp10 (PgHsp10D1 and PgHsp10D2) and an antisense form of PgHsp10pro (PgHsp10AS) were cloned into a plant expression vector (pMDC164) through gateway cloning. All four constructs were separately transformed into tobacco through Agrobacterium-mediated genetic transformation, and PCR-confirmed transgenic plants progressed to T1 and T2 generations. The T2 transgenic tobacco plants comprising all PgHsp10pro fragments were used for GUS histochemical and qRT-PCR assays in different tissues under control and abiotic stresses. The PgHsp10PC pro expression was specific to stem and seedlings under control conditions. Under different abiotic stresses, particularly heat stress, PgHsp10PCpro had relatively higher activity than PgHsp10D1pro, PgHsp10D2pro and PgHsp10ASpro. PgHsp10pro from a stress resilient crop like pearl millet responds positively to a range of abiotic stresses, in particular heat, when expressed in heterologous plant systems such as tobacco. Hence, PgHsp10pro appears to be a potential promoter candidate for developing heat and drought stress-tolerant crop plants.
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Affiliation(s)
- Divya Kummari
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad 502 324, India
| | - Pooja Bhatnagar-Mathur
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad 502 324, India
| | - Kiran K Sharma
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad 502 324, India
| | - Vincent Vadez
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad 502 324, India
| | - Sudhakar Reddy Palakolanu
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad 502 324, India.
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Shivhare R, Asif MH, Lata C. Comparative transcriptome analysis reveals the genes and pathways involved in terminal drought tolerance in pearl millet. PLANT MOLECULAR BIOLOGY 2020; 103:639-652. [PMID: 32430635 DOI: 10.1007/s11103-020-01015-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 05/11/2020] [Indexed: 05/09/2023]
Affiliation(s)
- Radha Shivhare
- CSIR- National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Mehar H Asif
- CSIR- National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Charu Lata
- CSIR- National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
- CSIR-National Institute of Science Communication and Information Resources, 14 Satsang Vihar Marg, New Delhi, 110067, India.
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Divya K, Kavi Kishor PB, Bhatnagar-Mathur P, Singam P, Sharma KK, Vadez V, Reddy PS. Isolation and functional characterization of three abiotic stress-inducible (Apx, Dhn and Hsc70) promoters from pearl millet (Pennisetum glaucum L.). Mol Biol Rep 2019; 46:6039-6052. [PMID: 31468258 DOI: 10.1007/s11033-019-05039-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Accepted: 08/20/2019] [Indexed: 12/17/2022]
Abstract
Pearl millet is a C4 cereal crop that grows in arid and semi-arid climatic conditions with the remarkable abiotic stress tolerance. It contributed to the understanding of stress tolerance not only at the physiological level but also at the genetic level. In the present study, we functionally cloned and characterized three abiotic stress-inducible promoters namely cytoplasmic Apx1 (Ascorbate peroxidase), Dhn (Dehydrin), and Hsc70 (Heat shock cognate) from pearl millet. Sequence analysis revealed that all three promoters have several cis-acting elements specific for temporal and spatial expression. PgApx pro, PgDhn pro and PgHsc70 pro were fused with uidA gene in Gateway-based plant transformation pMDC164 vector and transferred into tobacco through leaf-disc method. While PgApx pro and PgDhn pro were active in seedling stages, PgHsc70 pro was active in stem and root tissues of the T2 transgenic tobacco plants under control conditions. Higher activity was observed under high temperature and drought, and less in salt and cold stress conditions. Further, all three promoters displayed higher GUS gene expression in the stem, moderate expression in roots, and less expression in leaves under similar conditions. While RT-qPCR data showed that PgApx pro and PgDhn pro were expressed highly in high temperature, salt and drought, PgHsc70 pro was fairly expressed during high temperature stress only. Histochemical and RT-qPCR assays showed that all three promoters are inducible under abiotic stress conditions. Thus, these promoters appear to be immediate candidates for developing abiotic stress tolerant crops as these promoter-driven transgenics confer high degree of tolerance in comparison with the wild-type (WT) plants.
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Affiliation(s)
- Kummari Divya
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, 502 324, India
- Department of Genetics, Osmania University, Hyderabad, 500 007, India
| | - P B Kavi Kishor
- Department of Genetics, Osmania University, Hyderabad, 500 007, India
| | - Pooja Bhatnagar-Mathur
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, 502 324, India
| | - Prashanth Singam
- Department of Genetics, Osmania University, Hyderabad, 500 007, India
| | - Kiran K Sharma
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, 502 324, India
| | - Vincent Vadez
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, 502 324, India
| | - Palakolanu Sudhakar Reddy
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, 502 324, India.
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Shinde H, Dudhate A, Tsugama D, Gupta SK, Liu S, Takano T. Pearl millet stress-responsive NAC transcription factor PgNAC21 enhances salinity stress tolerance in Arabidopsis. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2019; 135:546-553. [PMID: 30447941 DOI: 10.1016/j.plaphy.2018.11.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 10/23/2018] [Accepted: 11/05/2018] [Indexed: 05/07/2023]
Abstract
Pearl millet (Pennisetum glaucum) is the sixth-leading cereal crop and a staple food crop. It is known for its high tolerance to abiotic stress and good nutrient profile. NAC (NAM, ATAF1/2 and CUC) transcription factors (TFs) play an important role in abiotic stress tolerance. In our study, the pearl millet stress-responsive NAC TF gene PgNAC21 was characterized. Gene expression analysis revealed that PgNAC21 expression is induced by salinity stress and abscisic acid (ABA) treatment. In silico promoter analysis showed the presence of ABA response elements (ABREs) and MYB TF binding sites. A yeast one-hybrid assay indicated that a putative MYB TF in pearl millet, PgMYB1, binds to the promoter of PgNAC21. A transactivation assay in yeast cells revealed that PgNAC21 functions as a transcription activator and that its activation domain is located in its C-terminus. Relative to control plants, Arabidopsis plants overexpressing PgNAC21 exhibited better seed germination, heavier fresh weight and greater root length under salinity stress. Overexpression of PgNAC21 in Arabidopsis plants also enhanced the expression of stress-responsive genes such as GSTF6 (GLUTATHIONE S-TRANSFERASE 6), COR47 (COLD-REGULATED 47) and RD20 (RESPONSIVE TO DEHYDRATION 20). Our data demonstrate that PgNAC21 functions as a stress-responsive NAC TF and can be utilized in transgenic approaches for developing salinity stress tolerance in crop plants.
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Affiliation(s)
- Harshraj Shinde
- Asian Natural Environmental Science Center (ANESC), The University of Tokyo, Nishitokyo-shi, Tokyo, 188-0002, Japan.
| | - Ambika Dudhate
- Asian Natural Environmental Science Center (ANESC), The University of Tokyo, Nishitokyo-shi, Tokyo, 188-0002, Japan.
| | - Daisuke Tsugama
- Laboratory of Crop Physiology, Research Faculty of Agriculture, Hokkaido University, Sapporo-shi, Hokkaido, Japan.
| | - Shashi K Gupta
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana State, India.
| | - Shenkui Liu
- State Key Laboratory of Subtropical Silviculture, Zhejiang A and F University, Lin'an, Hangzhou, China.
| | - Tetsuo Takano
- Asian Natural Environmental Science Center (ANESC), The University of Tokyo, Nishitokyo-shi, Tokyo, 188-0002, Japan.
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Molecular cloning, characterization and expression analysis of a heat shock protein 10 (Hsp10) from Pennisetum glaucum (L.), a C4 cereal plant from the semi-arid tropics. Mol Biol Rep 2016; 43:861-70. [PMID: 27206926 DOI: 10.1007/s11033-016-4012-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Accepted: 05/12/2016] [Indexed: 01/13/2023]
Abstract
Heat shock proteins (Hsp10) belong to the ubiquitous family of heat-shock molecular chaperones found in the organelles of both prokaryotes and eukaryotes. Chaperonins assist the folding of nascent and stress-destabilized proteins. A cDNA clone encoding a 10 kDa Hsp was isolated from pearl millet, Pennisetum glaucum (L.) by screening a heat stress cDNA library. The fulllength PgHsp10 cDNA consisted of 297 bp open reading frame (ORF) encoding a 98 amino acid polypeptide with a predicted molecular mass of 10.61 kDa and an estimated isoelectric point (pI) of 7.95. PgHsp10 shares 70-98 % sequence identity with other plant homologs. Phylogenetic analysis revealed that PgHsp10 is evolutionarily close to the maize Hsp10 homolog. The predicted 3D model confirmed a conserved eight-stranded ß-barrel with active site between the ß-barrel comprising of eight-strands, with conserved domain VLLPEYGG sandwiched between two ß-sheets. The gene consisted of 3 exons and 2 introns, while the position and phasing of these introns were conserved similar to other plant Hsp10 family genes. In silico analysis of the promoter region of PgHsp10 presented several distinct set of cis-elements and transcription factor binding sites. Quantitative RT-PCR analysis showed that PgHsp10 gene was differentially expressed in response to abiotic stresses with the highest level of expression under heat stress conditions. Results of this study provide useful information regarding the role of chaperonins in stress regulation and generated leads for further elucidation of their function in plant stress tolerance.
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Holmes GD, Hall NE, Gendall AR, Boon PI, James EA. Using Transcriptomics to Identify Differential Gene Expression in Response to Salinity among Australian Phragmites australis Clones. FRONTIERS IN PLANT SCIENCE 2016; 7:432. [PMID: 27148279 PMCID: PMC4829608 DOI: 10.3389/fpls.2016.00432] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 03/21/2016] [Indexed: 05/22/2023]
Abstract
Common Reed (Phragmites australis) is a frequent component of inland and coastal wetlands in temperate zones worldwide. Ongoing environmental changes have resulted in the decline of this species in many areas and invasive expansion in others. In the Gippsland Lakes coastal waterway system in south-eastern Australia, increasing salinity is thought to have contributed to the loss of fringing P. australis reed beds leading to increased shoreline erosion. A major goal of restoration in this waterway is to address the effect of salinity by planting a genetically diverse range of salt-tolerant P. australis plants. This has prompted an interest in examining the variation in salinity tolerance among clones and the underlying basis of this variation. Transcriptomics is an approach for identifying variation in genes and their expression levels associated with the exposure of plants to environmental stressors. In this paper we present initial results of the first comparative culm transcriptome analysis of P. australis clones. After sampling plants from sites of varied surface water salinity across the Gippsland Lakes, replicates from three clones from highly saline sites (>18 g L(-1) TDS) and three from low salinity sites (<6 g L(-1)) were grown in containers irrigated with either fresh (<0.1 g L(-1)) or saline water (16 g L(-1)). An RNA-Seq protocol was used to generate sequence data from culm tissues from the 12 samples allowing an analysis of differential gene expression. Among the key findings, we identified several genes uniquely up- or down-regulated in clones from highly saline sites when irrigated with saline water relative to clones from low salinity sites. These included the higher relative expression levels of genes associated with photosynthesis and lignan biosynthesis indicative of a greater ability of these clones to maintain growth under saline conditions. Combined with growth data from a parallel study, our data suggests local adaptation of certain clones to salinity and provides a basis for more detailed studies.
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Affiliation(s)
| | - Nathan E. Hall
- La Trobe Institute for Molecular Science, La Trobe University, BundooraVIC, Australia
- Department of Animal, Plant and Soil Sciences, AgriBio, La Trobe University, BundooraVIC, Australia
| | - Anthony R. Gendall
- Department of Animal, Plant and Soil Sciences, AgriBio, La Trobe University, BundooraVIC, Australia
| | - Paul I. Boon
- Institute for Sustainability and Innovation, Victoria University, Footscray ParkVIC, Australia
| | - Elizabeth A. James
- Royal Botanic Gardens Victoria, MelbourneVIC, Australia
- *Correspondence: Elizabeth A. James,
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