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Nivya VM, Shah JM. Recalcitrance to transformation, a hindrance for genome editing of legumes. Front Genome Ed 2023; 5:1247815. [PMID: 37810593 PMCID: PMC10551638 DOI: 10.3389/fgeed.2023.1247815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 09/06/2023] [Indexed: 10/10/2023] Open
Abstract
Plant genome editing, a recently discovered method for targeted mutagenesis, has emerged as a promising tool for crop improvement and gene function research. Many genome-edited plants, such as rice, wheat, and tomato, have emerged over the last decade. As the preliminary steps in the procedure for genome editing involve genetic transformation, amenability to genome editing depends on the efficiency of genetic engineering. Hence, there are numerous reports on the aforementioned crops because they are transformed with relative ease. Legume crops are rich in protein and, thus, are a favored source of plant proteins for the human diet in most countries. However, legume cultivation often succumbs to various biotic/abiotic threats, thereby leading to high yield loss. Furthermore, certain legumes like peanuts possess allergens, and these need to be eliminated as these deprive many people from gaining the benefits of such crops. Further genetic variations are limited in certain legumes. Genome editing has the potential to offer solutions to not only combat biotic/abiotic stress but also generate desirable knock-outs and genetic variants. However, excluding soybean, alfalfa, and Lotus japonicus, reports obtained on genome editing of other legume crops are less. This is because, excluding the aforementioned three legume crops, the transformation efficiency of most legumes is found to be very low. Obtaining a higher number of genome-edited events is desirable as it offers the option to genotypically/phenotypically select the best candidate, without the baggage of off-target mutations. Eliminating the barriers to genetic engineering would directly help in increasing genome-editing rates. Thus, this review aims to compare various legumes for their transformation, editing, and regeneration efficiencies and discusses various solutions available for increasing transformation and genome-editing rates in legumes.
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Affiliation(s)
| | - Jasmine M. Shah
- Department of Plant Science, Central University of Kerala, Kasaragod, Kerala, India
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Ganguly S, Purohit A, Ghosh S, Chaudhuri RK, Das S, Chakraborti D. Clean gene technology to develop selectable marker-free pod borer-resistant transgenic pigeon pea events involving the constitutive expression of Cry1Ac. Appl Microbiol Biotechnol 2022; 106:3051-3067. [PMID: 35441877 DOI: 10.1007/s00253-022-11922-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 04/04/2022] [Accepted: 04/08/2022] [Indexed: 11/29/2022]
Abstract
The most crucial yield constraint of pigeon pea is susceptibility to the pod borer Helicoverpa armigera, which causes extensive damage and severe economic losses every year. The Agrobacterium-mediated plumular meristem transformation technique was applied for the development of cry1Ac transgenic pigeon pea. Bioactivity of the cry1Ac gene was compared based on integration and expression driven by two promoters, the constitutive CaMV35S promoter and the green-tissue-specific ats1A promoter, in those transgenic events. The transgenic events also contained the selectable marker gene nptII flanked by loxP sites. Independent transgenic events expressing the Cre recombinase gene along with a linked bar selection marker were also developed. Integration and expression patterns of both cry1Ac and cre were confirmed through Southern and western blot analysis of T1 events. The constitutive expression of the Cry1Ac protein was found to be more effective for conferring resistant activity against H. armigera larvae in comparison to green-tissue-specific expression. Constitutively expressing Cry1Ac T1 events were crossed with Cre recombinase expressing T1 events. The crossing-based Cre/lox-mediated marker gene elimination strategy was demonstrated to generate nptII-free Cry1Ac-expressing T2 events. These events were subsequently analyzed in the T3 generation for the segregation of cre and bar genes. Five Cry1Ac-expressing T3 transgenic pigeon pea events were devoid of the nptII marker as well as cre-bar genes. H. armigera larval mortality in those marker-free T3 events was found to be 80-100%. The development of such nptII selectable marker-free Cry1Ac-expressing pigeon pea transgenics for the first time would greatly support the sustainable biotechnological breeding program for pod borer resistance in pigeon pea. KEY POINTS: • Constitutive expression of Cry1Ac conferred complete resistance against Helicoverpa armigera • Green-tissue-specific expression of Cry1Ac conferred partial pest resistance • Cre/lox-mediated nptII elimination was successful in constitutively expressing Cry1Ac transgenic pigeon pea events.
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Affiliation(s)
- Shreeparna Ganguly
- Department of Biotechnology, St. Xavier's College (Autonomous), 30, Mother Teresa Sarani, Kolkata - 700016, West Bengal, India.,Department of Genetics, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700019, West Bengal, India
| | - Arnab Purohit
- Department of Genetics, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700019, West Bengal, India
| | - Sanatan Ghosh
- Department of Genetics, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700019, West Bengal, India
| | - Rituparna Kundu Chaudhuri
- Department of Botany, Barasat Govt. College, 10, K.N.C. Road, Barasat, Kolkata - 700124, West Bengal, India
| | - Sampa Das
- Division of Plant Biology, Bose Institute, C.I.T. Scheme VII M, P1/12, Kankurgachi, Kolkata- 700054, West Bengal, India
| | - Dipankar Chakraborti
- Department of Genetics, University of Calcutta, 35, Ballygunge Circular Road, Kolkata - 700019, West Bengal, India.
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Choudhury A, Rajam MV. Genetic transformation of legumes: an update. PLANT CELL REPORTS 2021; 40:1813-1830. [PMID: 34230986 DOI: 10.1007/s00299-021-02749-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Accepted: 06/28/2021] [Indexed: 06/13/2023]
Abstract
This review summarizes the recent advances in legume genetic transformation and provides an insight into the critical factors that play a major role in the process. It also sheds light on some of the potential areas which may ameliorate the transformation of legumes. Legumes are an important group of dicotyledonous plants, highly enriched in proteins and minerals. Majority of the legume plants are cultivated in the arid and semi-arid parts of the world, and hence said to be climate resilient. They have the capability of atmospheric nitrogen fixation and thus play a vital role in the ecological sphere. However, the worldwide production of legumes is somehow not up to the mark and the yields are greatly affected by various biotic and abiotic stress factors. Genetic engineering strategies have emerged as a core of plant biology and remarkably facilitate the crop improvement programmes. A significant progress has been made towards the optimization of efficient transformation system for legume plants over the years but this group is still underutilized in comparison to other crops. Among the variety of available DNA delivery systems, Agrobacterium-mediated and particle bombardment have been primarily deployed for optimization and trait improvement. However, recalcitrance and genotype-dependence are some of the major bottlenecks for successful transformation. In this context, the present review summarizes the advances taken place in the area of legume transformation and provides an insight into the present scenario. The challenges and future possibilities for yield improvement have also been discussed.
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Affiliation(s)
- Aparajita Choudhury
- Department of Genetics, University of Delhi South Campus, Benito Juarez Road, New Delhi, 110021, India
| | - Manchikatla V Rajam
- Department of Genetics, University of Delhi South Campus, Benito Juarez Road, New Delhi, 110021, India.
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Dhaliwal SK, Talukdar A, Gautam A, Sharma P, Sharma V, Kaushik P. Developments and Prospects in Imperative Underexploited Vegetable Legumes Breeding: A Review. Int J Mol Sci 2020; 21:E9615. [PMID: 33348635 PMCID: PMC7766301 DOI: 10.3390/ijms21249615] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 11/15/2020] [Accepted: 11/23/2020] [Indexed: 02/07/2023] Open
Abstract
Vegetable legumes are an essential source of carbohydrates, vitamins, and minerals, along with health-promoting bioactive chemicals. The demand for the use of either fresh or processed vegetable legumes is continually expanding on account of the growing consumer awareness about their well-balanced diet. Therefore, sustaining optimum yields of vegetable legumes is extremely important. Here we seek to present d etails of prospects of underexploited vegetable legumes for food availability, accessibility, and improved livelihood utilization. So far research attention was mainly focused on pulse legumes' performance as compared to vegetable legumes. Wild and cultivated vegetable legumes vary morphologically across diverse habitats. This could make them less known, underutilized, and underexploited, and make them a promising potential nutritional source in developing nations where malnutrition still exists. Research efforts are required to promote underexploited vegetable legumes, for improving their use to feed the ever-increasing population in the future. In view of all the above points, here we have discussed underexploited vegetable legumes with tremendous potential; namely, vegetable pigeon pea (Cajanus cajan), cluster bean (Cyamopsis tetragonoloba), winged bean (Psophocarpus tetragonolobus), dolichos bean (Lablab purpureus), and cowpea (Vigna unguiculata), thereby covering the progress related to various aspects such as pre-breeding, molecular markers, quantitative trait locus (QTLs), genomics, and genetic engineering. Overall, this review has summarized the information related to advancements in the breeding of vegetable legumes which will ultimately help in ensuring food and nutritional security in developing nations.
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Affiliation(s)
- Sandeep Kaur Dhaliwal
- Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana 141004, India; (S.K.D.); (P.S.)
| | - Akshay Talukdar
- Division of Genetics, Indian Agricultural Research Institute, New Delhi 110012, India;
| | - Ashish Gautam
- Department of Genetics and Plant Breeding, G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand 263145, India;
| | - Pankaj Sharma
- Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana 141004, India; (S.K.D.); (P.S.)
| | - Vinay Sharma
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad 502324, India;
| | - Prashant Kaushik
- Instituto de Conservación y Mejora de la Agrodiversidad Valenciana, Universitat Politècnica de València, 46022 Valencia, Spain
- Nagano University, Ueda 386-0031, Japan
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Ramkumar N, Rathinam M, Singh S, Kesiraju K, Muniyandi V, Singh NK, Dash PK, Sreevathsa R. Assessment of Pigeonpea (Cajanus cajan L.) transgenics expressing Bt ICPs, Cry2Aa and Cry1AcF under nethouse containment implicated an effective control against herbivory by Helicoverpa armigera (Hübner). PEST MANAGEMENT SCIENCE 2020; 76:1902-1911. [PMID: 31840900 DOI: 10.1002/ps.5722] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 11/07/2019] [Accepted: 12/12/2019] [Indexed: 05/23/2023]
Abstract
BACKGROUND Pigeonpea is a source of quality proteins and the main constituent of a well-balanced diet for majority of Indian population. One of the major constraints in the production of pigeonpea is a polyphagous insect pest, Helicoverpa armigera. Non-availability of resistant sources in the germplasm and limitations in conventional breeding have been key factors for continued yield losses. Additionally, hazards of chemical fertilizers on the environment have prompted the scientific community to develop alternative strategies. Bacillus thuringiensis (Bt) insecticidal proteins (ICPs) have emerged as the most reliable source for the control of insect pests through transgenics. RESULTS Transgenic pigeonpea plants harboring validated Bt ICPs, Cry2Aa and Cry1AcF were developed by a non-tissue culture based in planta transformation strategy and assessed for integration of Transfer-DNA (T-DNA) and efficacy against pod borer under in vitro conditions. For the first time this study demonstrates the successful evaluation of 19 transgenic pigeonpea events (11 with cry2Aa and 8 with cry1AcF) under soil and pot conditions in a nethouse containment. The stability in the performance was assessed stringently by deliberate H. armigera larval challenging. The trial identified ten promising events of both the genes that portrayed reduced damage to the herbivore. CONCLUSION We present the first ever successful evaluation of pigeonpea transgenics with the ability to mitigate pod borer under nethouse conditions. The transgenics depicted molecular evidence for the stability of T-DNA integration, consistency in the expression of Cry proteins and resistance against H. armigera. These events can form a pool of useful transgenics to manage the devastating pod borer. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Nikhil Ramkumar
- ICAR - National Institute for Plant Biotechnology, New Delhi, India
| | - Maniraj Rathinam
- ICAR - National Institute for Plant Biotechnology, New Delhi, India
| | - Shweta Singh
- ICAR - National Institute for Plant Biotechnology, New Delhi, India
| | - Karthik Kesiraju
- ICAR - National Institute for Plant Biotechnology, New Delhi, India
| | | | | | - Prasanta K Dash
- ICAR - National Institute for Plant Biotechnology, New Delhi, India
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Karmakar S, Molla KA, Gayen D, Karmakar A, Das K, Sarkar SN, Datta K, Datta SK. Development of a rapid and highly efficient Agrobacterium-mediated transformation system for pigeon pea [ Cajanus cajan (L.) Millsp]. GM CROPS & FOOD 2019; 10:115-138. [PMID: 31187675 DOI: 10.1080/21645698.2019.1625653] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
An efficient genetic transformation system is a prerequisite for studying gene functions, molecular breeding program, and introducing new traits. Agrobacterium tumefaciens-mediated genetic transformation is a widely preferred and accepted method for many plants, including pigeon pea. However, the efficiency of transformation of pigeon pea using the existing protocols is low and time-consuming. In the present study, we developed a rapid and highly efficient transformation system of pigeon pea, using embryonic axis-attached cotyledons as explants. We systematically investigated the influence of varying optical densities of Agrobacterium suspension, duration of incubation, and co-cultivation on the transformation efficiency. In our system, a transformation efficiency of approximately 83% was achieved using Agrobacterium cells at an optical density (OD600) of 0.25, infection time of 15 min, and co-culturing with explants for 72 h in the light with 100µM acetosyringone. The entire procedure, starting from seed to establishment of transformed plants in soil, was achieved in 35-40 days. This is a rapid and highly efficient protocol for Agrobacterium-mediated transformation of pigeon pea, which could potentially be a useful reference, not only for the genetic improvement of pigeon pea but also for other recalcitrant leguminous plants.
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Affiliation(s)
- Subhasis Karmakar
- a Laboratory of Translational Research on Transgenic Crops, Department of Botany , University of Calcutta , Kolkata , India
| | - Kutubuddin Ali Molla
- b Crop Improvement Division , ICAR-National Rice Research Institute , Cuttack , India.,c The Huck Institute of the Life Sciences and Department of Plant Pathology and Environmental Microbiology , The Pennsylvania State University, University Park , PA , USA
| | - Dipak Gayen
- d School of Integrative Plant Sciences (SIPS) , Cornell University , Ithaca , NY , USA
| | - Aritra Karmakar
- a Laboratory of Translational Research on Transgenic Crops, Department of Botany , University of Calcutta , Kolkata , India
| | - Kaushik Das
- a Laboratory of Translational Research on Transgenic Crops, Department of Botany , University of Calcutta , Kolkata , India
| | - Sailendra Nath Sarkar
- a Laboratory of Translational Research on Transgenic Crops, Department of Botany , University of Calcutta , Kolkata , India
| | - Karabi Datta
- a Laboratory of Translational Research on Transgenic Crops, Department of Botany , University of Calcutta , Kolkata , India
| | - Swapan K Datta
- a Laboratory of Translational Research on Transgenic Crops, Department of Botany , University of Calcutta , Kolkata , India
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Panda S, Mishra SK, Naik A, Sahu SK, Panigrahi J. In vitro propagation of Cajanus cajan × C. cajanifolius hybrid and its characterization using cyto-morphological and SSR markers. THE NUCLEUS 2018. [DOI: 10.1007/s13237-018-0232-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Expression of Cry2Aa, a Bacillus thuringiensis insecticidal protein in transgenic pigeon pea confers resistance to gram pod borer, Helicoverpa armigera. Sci Rep 2018; 8:8820. [PMID: 29891840 PMCID: PMC5995972 DOI: 10.1038/s41598-018-26358-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 04/17/2018] [Indexed: 11/21/2022] Open
Abstract
Pigeon pea is an important legume infested by a plethora of insect pests amongst which gram pod borer Helicoverpa armigera is very prominent. Imparting resistance to this insect herbivore is of global importance in attaining food security. Expression of insecticidal crystal proteins (ICP) in diverse crops has led to increased resistance to several pests. We report in this paper, expression of Cry2Aa in transgenic pigeon pea and its effectiveness towards H. armigera by employing Agrobacterium-mediated in planta transformation approach. Approximately 0.8% of T1 generation plants were identified as putative transformants based on screening in the presence of 70 ppm kanamycin as the selection agent. Promising events were further recognized in advanced generations based on integration, expression and bioefficacy of the transgenes. Seven T3 lines (11.8% of the selected T1 events) were categorized as superior as these events demonstrated 80–100% mortality of the challenged larvae and improved ability to prevent damage caused by the larvae. The selected transgenic plants accumulated Cry2Aa in the range of 25–80 µg/g FW. The transgenic events developed in the study can be used in pigeon pea improvement programmes for pod borer resistance.
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Kaur G, Asthir B. Proline: a key player in plant abiotic stress tolerance. BIOLOGIA PLANTARUM 2015; 59:609-619. [PMID: 0 DOI: 10.1007/s10535-015-0549-3] [Citation(s) in RCA: 269] [Impact Index Per Article: 29.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
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Krishna G, Singh BK, Kim EK, Morya VK, Ramteke PW. Progress in genetic engineering of peanut (Arachis hypogaea L.)--a review. PLANT BIOTECHNOLOGY JOURNAL 2015; 13:147-62. [PMID: 25626474 DOI: 10.1111/pbi.12339] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 11/27/2014] [Accepted: 12/17/2014] [Indexed: 05/20/2023]
Abstract
Peanut (Arachis hypogaea L.) is a major species of the family, Leguminosae, and economically important not only for vegetable oil but as a source of proteins, minerals and vitamins. It is widely grown in the semi-arid tropics and plays a role in the world agricultural economy. Peanut production and productivity is constrained by several biotic (insect pests and diseases) and abiotic (drought, salinity, water logging and temperature aberrations) stresses, as a result of which crop experiences serious economic losses. Genetic engineering techniques such as Agrobacterium tumefaciens and DNA-bombardment-mediated transformation are used as powerful tools to complement conventional breeding and expedite peanut improvement by the introduction of agronomically useful traits in high-yield background. Resistance to several fungal, virus and insect pest have been achieved through variety of approaches ranging from gene coding for cell wall component, pathogenesis-related proteins, oxalate oxidase, bacterial chloroperoxidase, coat proteins, RNA interference, crystal proteins etc. To develop transgenic plants withstanding major abiotic stresses, genes coding transcription factors for drought and salinity, cytokinin biosynthesis, nucleic acid processing, ion antiporter and human antiapoptotic have been used. Moreover, peanut has also been used in vaccine production for the control of several animal diseases. In addition to above, this study also presents a comprehensive account on the influence of some important factors on peanut genetic engineering. Future research thrusts not only suggest the use of different approaches for higher expression of transgene(s) but also provide a way forward for the improvement of crops.
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Affiliation(s)
- Gaurav Krishna
- Jacob School of Biotechnology & Bioengineering, Sam Higginbottom Institute of Agriculture, Technology & Sciences (Formerly Allahabad Agricultural Institute), Deemed University, Allahabad, Uttar Pradesh, India
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