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Khan FS, Goher F, Zhang D, Shi P, Li Z, Htwe YM, Wang Y. Is CRISPR/Cas9 a way forward to fast-track genetic improvement in commercial palms? Prospects and limits. FRONTIERS IN PLANT SCIENCE 2022; 13:1042828. [PMID: 36578341 PMCID: PMC9791139 DOI: 10.3389/fpls.2022.1042828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
Commercially important palms (oil palm, coconut, and date palm) are widely grown perennial trees with tremendous commercial significance due to food, edible oil, and industrial applications. The mounting pressure on the human population further reinforces palms' importance, as they are essential crops to meet vegetable oil needs around the globe. Various conventional breeding methods are used for the genetic improvement of palms. However, adopting new technologies is crucial to accelerate breeding and satisfy the expanding population's demands. CRISPR/Cas9 is an efficient genome editing tool that can incorporate desired traits into the existing DNA of the plant without losing common traits. Recent progress in genome editing in oil palm, coconut and date palm are preliminarily introduced to potential readers. Furthermore, detailed information on available CRISPR-based genome editing and genetic transformation methods are summarized for researchers. We shed light on the possibilities of genome editing in palm crops, especially on the modification of fatty acid biosynthesis in oil palm. Moreover, the limitations in genome editing, including inadequate target gene screening due to genome complexities and low efficiency of genetic transformation, are also highlighted. The prospects of CRISPR/Cas9-based gene editing in commercial palms to improve sustainable production are also addressed in this review paper.
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Affiliation(s)
- Faiza Shafique Khan
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions/Sanya Research Institute of Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
- Hainan Yazhou Bay Seed Laboratory, Sanya, Hainan, China
- Hainan Key Laboratory of Tropical Oil Crops Biology, Coconut Research Institute of Chinese Academy of Tropical Agricultural Sciences, Wenchang, Hainan, China
| | - Farhan Goher
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, China
| | - Dapeng Zhang
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions/Sanya Research Institute of Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
- Hainan Key Laboratory of Tropical Oil Crops Biology, Coconut Research Institute of Chinese Academy of Tropical Agricultural Sciences, Wenchang, Hainan, China
| | - Peng Shi
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions/Sanya Research Institute of Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
- Hainan Key Laboratory of Tropical Oil Crops Biology, Coconut Research Institute of Chinese Academy of Tropical Agricultural Sciences, Wenchang, Hainan, China
| | - Zhiying Li
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions/Sanya Research Institute of Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
- Hainan Key Laboratory of Tropical Oil Crops Biology, Coconut Research Institute of Chinese Academy of Tropical Agricultural Sciences, Wenchang, Hainan, China
| | - Yin Min Htwe
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions/Sanya Research Institute of Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
- Hainan Yazhou Bay Seed Laboratory, Sanya, Hainan, China
- Hainan Key Laboratory of Tropical Oil Crops Biology, Coconut Research Institute of Chinese Academy of Tropical Agricultural Sciences, Wenchang, Hainan, China
| | - Yong Wang
- Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions/Sanya Research Institute of Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, China
- Hainan Key Laboratory of Tropical Oil Crops Biology, Coconut Research Institute of Chinese Academy of Tropical Agricultural Sciences, Wenchang, Hainan, China
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Alhudaib KA, El-Ganainy SM, Almaghasla MI, Sattar MN. Characterization and Control of Thielaviopsis punctulata on Date Palm in Saudi Arabia. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11030250. [PMID: 35161231 PMCID: PMC8839011 DOI: 10.3390/plants11030250] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/10/2022] [Accepted: 01/10/2022] [Indexed: 06/01/2023]
Abstract
Date palm (Phoenix dactylifera L.) is the most important edible fruit crop in Saudi Arabia. Date palm cultivation and productivity are severely affected by various fungal diseases in date palm-producing countries. In recent years, black scorch disease has emerged as a devastating disease affecting date palm cultivation in the Arabian Peninsula. In the current survey, leaves and root samples were collected from deteriorated date palm trees showing variable symptoms of neck bending, leaf drying, tissue necrosis, wilting, and mortality of the entire tree in the Al-Ahsa region of Saudi Arabia. During microscopic examination, the fungus isolates growing on potato dextrose agar (PDA) media produced thick-walled chlamydospores and endoconidia. The morphological characterization confirmed the presence of Thielaviopsis punctulata in the date palm plant samples as the potential agent of black scorch disease. The results were further confirmed by polymerase chain reaction (PCR), sequencing, and phylogenetic dendrograms of partial regions of the ITS, TEF1-α, and β-tubulin genes. The nucleotide sequence comparison showed that the T. punctulata isolates were 99.9-100% identical to each other and to the T. punctulata isolate identified from Iraq-infecting date palm trees. The pathogenicity of the three selected T. punctulata isolates was also confirmed on date palm plants of Khalas cultivar. The morphological, molecular, and pathogenicity results confirmed that T. punctulata causes black scorch disease in symptomatic date palm plants in Saudi Arabia. Furthermore, seven commercially available fungicides were also tested for their potential efficacy to control black scorch disease. The in vitro application of the three fungicides Aliette, Score, and Tachigazole reduced the fungal growth zone by 86-100%, respectively, whereas the in vivo studies determined that the fungicides Aliette and Score significantly impeded the mycelial progression of T. punctulata with 40% and 73% efficiency, respectively. These fungicides can be used in integrated disease management (IDM) strategies to curb black scorch disease.
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Affiliation(s)
- Khalid A. Alhudaib
- Department of Arid Land Agriculture, College of Agriculture and Food Sciences, King Faisal University, P.O. Box 420, Al-Ahsa 31982, Saudi Arabia; (K.A.A.); (S.M.E.-G.); (M.I.A.)
- Plant Pests, and Diseases Unit, College of Agriculture and Food Sciences, King Faisal University, P.O. Box 420, Al-Ahsa 31982, Saudi Arabia
| | - Sherif M. El-Ganainy
- Department of Arid Land Agriculture, College of Agriculture and Food Sciences, King Faisal University, P.O. Box 420, Al-Ahsa 31982, Saudi Arabia; (K.A.A.); (S.M.E.-G.); (M.I.A.)
- Plant Pests, and Diseases Unit, College of Agriculture and Food Sciences, King Faisal University, P.O. Box 420, Al-Ahsa 31982, Saudi Arabia
- Vegetable Diseases Research Department, Plant Pathology Research Institute, ARC, Giza 12619, Egypt
| | - Mustafa I. Almaghasla
- Department of Arid Land Agriculture, College of Agriculture and Food Sciences, King Faisal University, P.O. Box 420, Al-Ahsa 31982, Saudi Arabia; (K.A.A.); (S.M.E.-G.); (M.I.A.)
- Plant Pests, and Diseases Unit, College of Agriculture and Food Sciences, King Faisal University, P.O. Box 420, Al-Ahsa 31982, Saudi Arabia
| | - Muhammad N. Sattar
- Central Laboratories, King Faisal University, P.O. Box 420, Al-Ahsa 31982, Saudi Arabia
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Lobato-Gómez M, Hewitt S, Capell T, Christou P, Dhingra A, Girón-Calva PS. Transgenic and genome-edited fruits: background, constraints, benefits, and commercial opportunities. HORTICULTURE RESEARCH 2021; 8:166. [PMID: 34274949 PMCID: PMC8286259 DOI: 10.1038/s41438-021-00601-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 04/14/2021] [Accepted: 05/20/2021] [Indexed: 05/14/2023]
Abstract
Breeding has been used successfully for many years in the fruit industry, giving rise to most of today's commercial fruit cultivars. More recently, new molecular breeding techniques have addressed some of the constraints of conventional breeding. However, the development and commercial introduction of such novel fruits has been slow and limited with only five genetically engineered fruits currently produced as commercial varieties-virus-resistant papaya and squash were commercialized 25 years ago, whereas insect-resistant eggplant, non-browning apple, and pink-fleshed pineapple have been approved for commercialization within the last 6 years and production continues to increase every year. Advances in molecular genetics, particularly the new wave of genome editing technologies, provide opportunities to develop new fruit cultivars more rapidly. Our review, emphasizes the socioeconomic impact of current commercial fruit cultivars developed by genetic engineering and the potential impact of genome editing on the development of improved cultivars at an accelerated rate.
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Affiliation(s)
- Maria Lobato-Gómez
- Department of Crop and Forest Sciences, University of Lleida-Agrotecnio CERCA Center, Lleida, 25198, Spain
| | - Seanna Hewitt
- Department of Horticulture, Washington State University, PO Box, 646414, Pullman, WA, USA
| | - Teresa Capell
- Department of Crop and Forest Sciences, University of Lleida-Agrotecnio CERCA Center, Lleida, 25198, Spain
| | - Paul Christou
- Department of Crop and Forest Sciences, University of Lleida-Agrotecnio CERCA Center, Lleida, 25198, Spain
- ICREA, Catalan Institute for Research and Advanced Studies, 08010, Barcelona, Spain
| | - Amit Dhingra
- Department of Horticulture, Washington State University, PO Box, 646414, Pullman, WA, USA
| | - Patricia Sarai Girón-Calva
- Department of Crop and Forest Sciences, University of Lleida-Agrotecnio CERCA Center, Lleida, 25198, Spain.
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Sattar MN, Iqbal Z, Al-Khayri JM, Jain SM. Induced Genetic Variations in Fruit Trees Using New Breeding Tools: Food Security and Climate Resilience. PLANTS (BASEL, SWITZERLAND) 2021; 10:1347. [PMID: 34371550 PMCID: PMC8309169 DOI: 10.3390/plants10071347] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Revised: 06/23/2021] [Accepted: 06/28/2021] [Indexed: 12/22/2022]
Abstract
Fruit trees provide essential nutrients to humans by contributing to major agricultural outputs and economic growth globally. However, major constraints to sustainable agricultural productivity are the uncontrolled proliferation of the population, and biotic and abiotic stresses. Tree mutation breeding has been substantially improved using different physical and chemical mutagens. Nonetheless, tree plant breeding has certain crucial bottlenecks including a long life cycle, ploidy level, occurrence of sequence polymorphisms, nature of parthenocarpic fruit development and linkage. Genetic engineering of trees has focused on boosting quality traits such as productivity, wood quality, and resistance to biotic and abiotic stresses. Recent technological advances in genome editing provide a unique opportunity for the genetic improvement of woody plants. This review examines application of the CRISPR-Cas system to reduce disease susceptibility, alter plant architecture, enhance fruit quality, and improve yields. Examples are discussed of the contemporary CRISPR-Cas system to engineer easily scorable PDS genes, modify lignin, and to alter the flowering onset, fertility, tree architecture and certain biotic stresses.
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Affiliation(s)
- Muhammad Naeem Sattar
- Central Laboratories, King Faisal University, Al-Ahsa 31982, Saudi Arabia; (M.N.S.); (Z.I.)
| | - Zafar Iqbal
- Central Laboratories, King Faisal University, Al-Ahsa 31982, Saudi Arabia; (M.N.S.); (Z.I.)
| | - Jameel M. Al-Khayri
- Department of Agricultural Biotechnology, College of Agriculture and Food Sciences, King Faisal University, Al-Ahsa 31982, Saudi Arabia
| | - S. Mohan Jain
- Department of Agricultural Sciences, PL-27, University of Helsinki, 00014 Helsinki, Finland;
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Al-Khateeb SA, Al-Khateeb AA, Sattar MN, Mohmand AS. Induced in vitro adaptation for salt tolerance in date palm (Phoenix dactylifera L.) cultivar Khalas. Biol Res 2020; 53:37. [PMID: 32847618 PMCID: PMC7450699 DOI: 10.1186/s40659-020-00305-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 08/11/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Soil salinity causes huge economic losses to agriculture productivity in arid and semiarid areas worldwide. The affected plants face disturbances in osmotic adjustment, nutrient transport, ionic toxicity and reduced photosynthesis. Conventional breeding approaches produce little success in combating various stresses in plants. However, non-conventional approaches, such as in vitro tissue culturing, produce genetic variability in the development of salt-tolerant plants, particularly in woody trees. RESULTS Embryogenic callus cultures of the date palm cultivar Khalas were subjected to various salt levels ranging from 0 to 300 mM in eight subcultures. The regenerants obtained from the salt-treated cultures were regenerated and evaluated using the same concentration of NaCl with which the calli were treated. All the salt-adapted (SA) regenerants showed improved growth characteristics, physiological performance, ion concentrations and K+/Na+ ratios than the salt non-adapted (SNA) regenerants and the control. Regression between the leaf Na+ concentration and net photosynthesis revealed an inverse nonlinear correlation in the SNA regenerants. Leaf K+ contents and stomatal conductance showed a strong linear relationship in SA regenerants compared with the inverse linear correlation, and a very poor coefficient of determination in SNA regenerants. The genetic fidelity of the selected SA regenerants was also tested using 36 random amplified polymorphic DNA (RAPD) primers, of which 26 produced scorable bands. The primers generated 1-10 bands, with an average of 5.4 bands per RAPD primer; there was no variation between SA regenerants and the negative control. CONCLUSION This is the first report of the variants generated from salt-stressed cultures and their potential adaptation to salinity in date palm cv. Khalas. The massive production of salt stress-adapted date palm plants may be much easier using the salt adaptation approach. Such plants can perform better during exposure to salt stress compared to the non-treated date palm plants.
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Affiliation(s)
- Suliman A Al-Khateeb
- Department of Environment Natural Resources, College of Agriculture and Food Sciences, King Faisal University, P.O. Box 400, Al-Ahsa, 31982, Kingdom of Saudi Arabia.
| | - Abdullatif A Al-Khateeb
- Department of Agriculture Biotechnology, College of Agriculture and Food Sciences, King Faisal University, P.O. Box 400, Al-Ahsa, 31982, Kingdom of Saudi Arabia
| | - Muhammad N Sattar
- Central Laboratories, King Faisal University, Box 420, Al-Ahsa, 31982, Saudi Arabia
| | - Akbar S Mohmand
- Research, Innovation and Commercialization (ORIC), Bacha Khan University Charsadda, Charsadda, Khyber Pakhtunkhawa, Pakistan
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Hazzouri KM, Flowers JM, Nelson D, Lemansour A, Masmoudi K, Amiri KMA. Prospects for the Study and Improvement of Abiotic Stress Tolerance in Date Palms in the Post-genomics Era. FRONTIERS IN PLANT SCIENCE 2020; 11:293. [PMID: 32256513 PMCID: PMC7090123 DOI: 10.3389/fpls.2020.00293] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Accepted: 02/26/2020] [Indexed: 05/05/2023]
Abstract
Date palm (Phoenix dactylifera L.) is a socio-economically important crop in the Middle East and North Africa and a major contributor to food security in arid regions of the world. P. dactylifera is both drought and salt tolerant, but recent water shortages and increases in groundwater and soil salinity have threatened the continued productivity of the crop. Recent studies of date palm have begun to elucidate the physiological mechanisms of abiotic stress tolerance and the genes and biochemical pathways that control the response to these stresses. Here we review recent studies on tolerance of date palm to salinity and drought stress, the role of the soil and root microbiomes in abiotic stress tolerance, and highlight recent findings of omic-type studies. We present a perspective on future research of abiotic stress in date palm that includes improving existing genome resources, application of genetic mapping to determine the genetic basis of variation in tolerances among cultivars, and adoption of gene-editing technologies to the study of abiotic stress in date palms. Development of necessary resources and application of the proposed methods will provide a foundation for future breeders and genetic engineers aiming to develop more stress-tolerant cultivars of date palm.
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Affiliation(s)
- Khaled Michel Hazzouri
- Khalifa Center for Genetic Engineering and Biotechnology, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Jonathan M. Flowers
- Center for Genomics and Systems Biology (CGSB), New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
- Center for Genomics and Systems Biology, New York University, New York, NY, United States
| | - David Nelson
- Center for Genomics and Systems Biology (CGSB), New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
| | | | - Khaled Masmoudi
- College of Food and Agriculture, Department of Integrative Agriculture, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Khaled M. A. Amiri
- Khalifa Center for Genetic Engineering and Biotechnology, United Arab Emirates University, Al Ain, United Arab Emirates
- College of Science, Department of Biology, United Arab Emirates University, Al Ain, United Arab Emirates
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Yarra R, Jin L, Zhao Z, Cao H. Progress in Tissue Culture and Genetic Transformation of Oil Palm: An Overview. Int J Mol Sci 2019; 20:E5353. [PMID: 31661801 PMCID: PMC6862151 DOI: 10.3390/ijms20215353] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2019] [Revised: 10/24/2019] [Accepted: 10/25/2019] [Indexed: 11/24/2022] Open
Abstract
Oil palm (Elaeis guineensis, Jacq.) is a prominent vegetable-oil-yielding crop. Cultivating high-yielding oil palm with improved traits is a pre-requisite to meet the increasing demands of palm oil consumption. However, tissue culture and biotechnological approaches can resolve these concerns. Over the past three decades, significant research has been carried out to develop tissue culture and genetic transformation protocols for oil palm. Somatic embryogenesis is an efficient platform for the micropropagation of oil palm on a large scale. In addition, various genetic transformation techniques, including microprojectile bombardment, Agrobacterium tumefaciens mediated, Polyethylene glycol mediated mediated, and DNA microinjection, have been developed by optimizing various parameters for the efficient genetic transformation of oil palm. This review mainly emphasizes the methods established for in vitro propagation and genetic transformation of oil palm. Finally, we propose the application of the genome editing tool CRISPR/Cas9 to improve the various traits in this oil yielding crop.
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Affiliation(s)
- Rajesh Yarra
- Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang 571339, China.
- Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China.
| | - Longfei Jin
- Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang 571339, China.
| | - Zhihao Zhao
- Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang 571339, China.
| | - Hongxing Cao
- Coconut Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wenchang 571339, China.
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Hameed A, Shan-E-Ali Zaidi S, Sattar MN, Iqbal Z, Tahir MN. CRISPR technology to combat plant RNA viruses: A theoretical model for Potato virus Y (PVY) resistance. Microb Pathog 2019; 133:103551. [PMID: 31125685 DOI: 10.1016/j.micpath.2019.103551] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 05/17/2019] [Indexed: 12/26/2022]
Abstract
RNA viruses are the most diverse phytopathogens which cause severe epidemics in important agricultural crops and threaten the global food security. Being obligatory intracellular pathogens, these viruses have developed fine-tuned evading mechanisms and are non-responsive to most of the prophylactic treatments. Additionally, their sprint ability to overcome host defense demands a broad-spectrum and durable mechanism of resistance. In context of CRISPR-Cas discoveries, some variants of Cas effectors have been characterized as programmable RNA-guided RNases in the microbial genomes and could be reprogramed in mammalian and plant cells with guided RNase activity. Recently, the RNA variants of CRISPR-Cas systems have been successfully employed in plants to engineer resistance against RNA viruses. Some variants of CRISPR-Cas9 have been tamed either for directly targeting plant RNA viruses' genome or through targeting the host genes/factors assisting in viral proliferation. The new frontiers in CRISPR-Cas discoveries, and more importantly shifting towards RNA targeting will pyramid the opportunities in plant virus research. The current review highlights the probable implications of CRISPR-Cas system to confer the pathogen-derived or host-mediated resistance against phytopathogenic RNA viruses. Furthermore, a multiplexed CRISPR-Cas13a methodology is proposed here to combat Potato virus Y (PVY); a globally diverse phytopathogen infecting multiple crops.
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Affiliation(s)
- Amir Hameed
- Akhuwat Faisalabad Institute of Research Science and Technology, Faisalabad, Pakistan; Department of Bioinformatics & Biotechnology, Government College University, Allama Iqbal Road, Faisalabad, Pakistan.
| | | | - Muhammad Naeem Sattar
- Department of Biotechnology, College of Agriculture and Food Science, King Faisal University, Box 400, Al-Ahsa, 3192, Saudi Arabia
| | - Zafar Iqbal
- Department of Plant Pathology, University of Florida, Gainesville, 32611, FL, USA
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Wang T, Zhang H, Zhu H. CRISPR technology is revolutionizing the improvement of tomato and other fruit crops. HORTICULTURE RESEARCH 2019; 6:77. [PMID: 31240102 PMCID: PMC6570646 DOI: 10.1038/s41438-019-0159-x] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 02/25/2019] [Accepted: 04/26/2019] [Indexed: 05/06/2023]
Abstract
Fruits are major sources of essential nutrients and serve as staple foods in some areas of the world. The increasing human population and changes in climate experienced worldwide make it urgent to the production of fruit crops with high yield and enhanced adaptation to the environment, for which conventional breeding is unlikely to meet the demand. Fortunately, clustered regularly interspaced short palindromic repeat (CRISPR) technology paves the way toward a new horizon for fruit crop improvement and consequently revolutionizes plant breeding. In this review, the mechanism and optimization of the CRISPR system and its application to fruit crops, including resistance to biotic and abiotic stresses, fruit quality improvement, and domestication are highlighted. Controversies and future perspectives are discussed as well.
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Affiliation(s)
- Tian Wang
- College of Food Science and Nutritional Engineering, China Agricultural University, 100083 Beijing, China
| | - Hongyan Zhang
- Key Laboratory of Food Nutrition and Safety of Shandong Normal University, College of Life Science, Shandong Normal University, 250014 Jinan, China
| | - Hongliang Zhu
- College of Food Science and Nutritional Engineering, China Agricultural University, 100083 Beijing, China
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Gros-Balthazard M, Hazzouri KM, Flowers JM. Genomic Insights into Date Palm Origins. Genes (Basel) 2018; 9:genes9100502. [PMID: 30336633 PMCID: PMC6211059 DOI: 10.3390/genes9100502] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2018] [Revised: 10/03/2018] [Accepted: 10/03/2018] [Indexed: 11/16/2022] Open
Abstract
With the development of next-generation sequencing technology, the amount of date palm (Phoenix dactylifera L.) genomic data has grown rapidly and yielded new insights into this species and its origins. Here, we review advances in understanding of the evolutionary history of the date palm, with a particular emphasis on what has been learned from the analysis of genomic data. We first record current genomic resources available for date palm including genome assemblies and resequencing data. We discuss new insights into its domestication and diversification history based on these improved genomic resources. We further report recent discoveries such as the existence of wild ancestral populations in remote locations of Oman and high differentiation between African and Middle Eastern populations. While genomic data are consistent with the view that domestication took place in the Gulf region, they suggest that the process was more complex involving multiple gene pools and possibly a secondary domestication. Many questions remain unanswered, especially regarding the genetic architecture of domestication and diversification. We provide a road map to future studies that will further clarify the domestication history of this iconic crop.
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Affiliation(s)
- Muriel Gros-Balthazard
- Center for Genomics and Systems Biology, New York University Abu Dhabi, Saadiyat Island, P.O. Box 129188, Abu Dhabi, UAE.
| | - Khaled Michel Hazzouri
- Khalifa Center for Genetic Engineering and Biotechnology (KCGEB), United Arab Emirates University, P.O. Box 15551, Al Ain, UAE.
| | - Jonathan Mark Flowers
- Center for Genomics and Systems Biology, New York University Abu Dhabi, Saadiyat Island, P.O. Box 129188, Abu Dhabi, UAE.
- Department of Biology, Center for Genomics and Systems Biology, 12 Waverly Place, New York University, New York, NY 10003, USA.
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Jaganathan D, Ramasamy K, Sellamuthu G, Jayabalan S, Venkataraman G. CRISPR for Crop Improvement: An Update Review. FRONTIERS IN PLANT SCIENCE 2018; 9:985. [PMID: 30065734 PMCID: PMC6056666 DOI: 10.3389/fpls.2018.00985] [Citation(s) in RCA: 217] [Impact Index Per Article: 36.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 06/18/2018] [Indexed: 05/06/2023]
Abstract
The availability of genome sequences for several crops and advances in genome editing approaches has opened up possibilities to breed for almost any given desirable trait. Advancements in genome editing technologies such as zinc finger nucleases (ZFNs), transcription activator-like effector nucleases (TALENs) has made it possible for molecular biologists to more precisely target any gene of interest. However, these methodologies are expensive and time-consuming as they involve complicated steps that require protein engineering. Unlike first-generation genome editing tools, CRISPR/Cas9 genome editing involves simple designing and cloning methods, with the same Cas9 being potentially available for use with different guide RNAs targeting multiple sites in the genome. After proof-of-concept demonstrations in crop plants involving the primary CRISPR-Cas9 module, several modified Cas9 cassettes have been utilized in crop plants for improving target specificity and reducing off-target cleavage (e.g., Nmcas9, Sacas9, and Stcas9). Further, the availability of Cas9 enzymes from additional bacterial species has made available options to enhance specificity and efficiency of gene editing methodologies. This review summarizes the options available to plant biotechnologists to bring about crop improvement using CRISPR/Cas9 based genome editing tools and also presents studies where CRISPR/Cas9 has been used for enhancing biotic and abiotic stress tolerance. Application of these techniques will result in the development of non-genetically modified (Non-GMO) crops with the desired trait that can contribute to increased yield potential under biotic and abiotic stress conditions.
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Affiliation(s)
- Deepa Jaganathan
- Plant Molecular Biology Laboratory, Department of Biotechnology, M. S. Swaminathan Research Foundation, Chennai, India
| | | | | | | | - Gayatri Venkataraman
- Plant Molecular Biology Laboratory, Department of Biotechnology, M. S. Swaminathan Research Foundation, Chennai, India
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Jaganathan D, Ramasamy K, Sellamuthu G, Jayabalan S, Venkataraman G. CRISPR for Crop Improvement: An Update Review. FRONTIERS IN PLANT SCIENCE 2018. [PMID: 30065734 DOI: 10.3389/fpls.2018.0098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The availability of genome sequences for several crops and advances in genome editing approaches has opened up possibilities to breed for almost any given desirable trait. Advancements in genome editing technologies such as zinc finger nucleases (ZFNs), transcription activator-like effector nucleases (TALENs) has made it possible for molecular biologists to more precisely target any gene of interest. However, these methodologies are expensive and time-consuming as they involve complicated steps that require protein engineering. Unlike first-generation genome editing tools, CRISPR/Cas9 genome editing involves simple designing and cloning methods, with the same Cas9 being potentially available for use with different guide RNAs targeting multiple sites in the genome. After proof-of-concept demonstrations in crop plants involving the primary CRISPR-Cas9 module, several modified Cas9 cassettes have been utilized in crop plants for improving target specificity and reducing off-target cleavage (e.g., Nmcas9, Sacas9, and Stcas9). Further, the availability of Cas9 enzymes from additional bacterial species has made available options to enhance specificity and efficiency of gene editing methodologies. This review summarizes the options available to plant biotechnologists to bring about crop improvement using CRISPR/Cas9 based genome editing tools and also presents studies where CRISPR/Cas9 has been used for enhancing biotic and abiotic stress tolerance. Application of these techniques will result in the development of non-genetically modified (Non-GMO) crops with the desired trait that can contribute to increased yield potential under biotic and abiotic stress conditions.
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Affiliation(s)
- Deepa Jaganathan
- Plant Molecular Biology Laboratory, Department of Biotechnology, M. S. Swaminathan Research Foundation, Chennai, India
| | - Karthikeyan Ramasamy
- Plant Molecular Biology Laboratory, Department of Biotechnology, M. S. Swaminathan Research Foundation, Chennai, India
| | - Gothandapani Sellamuthu
- Plant Molecular Biology Laboratory, Department of Biotechnology, M. S. Swaminathan Research Foundation, Chennai, India
| | - Shilpha Jayabalan
- Plant Molecular Biology Laboratory, Department of Biotechnology, M. S. Swaminathan Research Foundation, Chennai, India
| | - Gayatri Venkataraman
- Plant Molecular Biology Laboratory, Department of Biotechnology, M. S. Swaminathan Research Foundation, Chennai, India
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