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Obala J, Saxena RK, Singh VK, Kumar CVS, Saxena KB, Tongoona P, Sibiya J, Varshney RK. Development of sequence-based markers for seed protein content in pigeonpea. Mol Genet Genomics 2018; 294:57-68. [PMID: 30173295 DOI: 10.1007/s00438-018-1484-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 08/22/2018] [Indexed: 12/30/2022]
Abstract
Pigeonpea is an important source of dietary protein to over a billion people globally, but genetic enhancement of seed protein content (SPC) in the crop has received limited attention for a long time. Use of genomics-assisted breeding would facilitate accelerating genetic gain for SPC. However, neither genetic markers nor genes associated with this important trait have been identified in this crop. Therefore, the present study exploited whole genome re-sequencing (WGRS) data of four pigeonpea genotypes (~ 12X coverage) to identify sequence-based markers and associated candidate genes for SPC. By combining a common variant filtering strategy on available WGRS data with knowledge of gene functions in relation to SPC, 108 sequence variants from 57 genes were identified. These genes were assigned to 19 GO molecular function categories with 56% belonging to only two categories. Furthermore, Sanger sequencing confirmed presence of 75.4% of the variants in 37 genes. Out of 30 sequence variants converted into CAPS/dCAPS markers, 17 showed high level of polymorphism between low and high SPC genotypes. Assay of 16 of the polymorphic CAPS/dCAPS markers on an F2 population of the cross ICP 5529 (high SPC) × ICP 11605 (low SPC), resulted in four of the CAPS/dCAPS markers significantly (P < 0.05) co-segregated with SPC. In summary, four markers derived from mutations in four genes will be useful for enhancing/regulating SPC in pigeonpea crop improvement programs.
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Affiliation(s)
- Jimmy Obala
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, 502324, India
- University of KwaZulu-Natal, African Center for Crop Improvement, Scottsville, Pietermaritzburg, 3209, South Africa
| | - Rachit K Saxena
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, 502324, India
| | - Vikas K Singh
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, 502324, India
| | - C V Sameer Kumar
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, 502324, India
| | - K B Saxena
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, 502324, India
| | - Pangirayi Tongoona
- University of KwaZulu-Natal, African Center for Crop Improvement, Scottsville, Pietermaritzburg, 3209, South Africa
| | - Julia Sibiya
- University of KwaZulu-Natal, African Center for Crop Improvement, Scottsville, Pietermaritzburg, 3209, South Africa
| | - Rajeev K Varshney
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, 502324, India.
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Saxena RK, Obala J, Sinjushin A, Kumar CVS, Saxena KB, Varshney RK. Characterization and mapping of Dt1 locus which co-segregates with CcTFL1 for growth habit in pigeonpea. Theor Appl Genet 2017; 130:1773-1784. [PMID: 28540572 PMCID: PMC5565653 DOI: 10.1007/s00122-017-2924-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 05/11/2017] [Indexed: 05/13/2023]
Abstract
We report growth habit profiling following SEM, genetic mapping and QTL analysis. Highlighted CcTFL1 , a candidate for determinacy in pigeonpea, since an Indel marker derived from this gene co-segregated with Dt1 locus. Pigeonpea (Cajanus cajan) is one of the most important legume crops grown in arid and semi-arid regions of the world. It is characterized with few unique features compared with other legume species, such as Lotus, Medicago, and Glycine. One of them is growth habit, an important agronomic trait. In the present study, identification of mutations affecting growth habit accompanied by a precise analysis of phenotype has been done which will shed more light upon developmental regulation in pigeonpea. A genetic study was conducted to examine the inheritance of growth habit and a genotyping by sequencing (GBS)-based genetic map constructed using F2 mapping population derived from crossing parents ICP 5529 and ICP 11605. Inheritance studies clearly demonstrated the dominance of indeterminate (IDT) growth habit over determinate (DT) growth habit in F2 and F2:3 progenies. A total of 787 SNP markers were mapped in the genetic map of 1454 cM map length. Growth habit locus (Dt1) was mapped on the CcLG03 contributing more than 61% of total phenotypic variations. Subsequently, QTL analysis highlighted one gene, CcTFL1, as a candidate for determinacy in pigeonpea, since an Indel marker derived from this gene co-segregated with the Dt1 locus. Ability of this Indel-derived marker to differentiate DT/IDT lines was also validated on 262 pigeonpea lines. This study clearly demonstrated that CcTFL1 is a candidate gene for growth habit in pigeonpea and a user-friendly marker was developed in the present study which will allow low-cost genotyping without need of automation.
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Affiliation(s)
- Rachit K Saxena
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, 502324, India.
| | - Jimmy Obala
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, 502324, India
- University of KwaZulu-Natal, African Center for Crop Improvement, Private Bag X01, Scottsville, 3209, Pietermaritzburg, South Africa
| | - Andrey Sinjushin
- M. V. Lomonosov Moscow State University, Leninskie Gory, Moscow, 119991, Russia
| | - C V Sameer Kumar
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, 502324, India
| | - K B Saxena
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, 502324, India
| | - Rajeev K Varshney
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, 502324, India.
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Pazhamala L, Saxena RK, Singh VK, Sameerkumar CV, Kumar V, Sinha P, Patel K, Obala J, Kaoneka SR, Tongoona P, Shimelis HA, Gangarao NVPR, Odeny D, Rathore A, Dharmaraj PS, Yamini KN, Varshney RK. Genomics-assisted breeding for boosting crop improvement in pigeonpea (Cajanus cajan). Front Plant Sci 2015; 6:50. [PMID: 25741349 PMCID: PMC4330709 DOI: 10.3389/fpls.2015.00050] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 01/20/2015] [Indexed: 05/18/2023]
Abstract
Pigeonpea is an important pulse crop grown predominantly in the tropical and sub-tropical regions of the world. Although pigeonpea growing area has considerably increased, yield has remained stagnant for the last six decades mainly due to the exposure of the crop to various biotic and abiotic constraints. In addition, low level of genetic variability and limited genomic resources have been serious impediments to pigeonpea crop improvement through modern breeding approaches. In recent years, however, due to the availability of next generation sequencing and high-throughput genotyping technologies, the scenario has changed tremendously. The reduced sequencing costs resulting in the decoding of the pigeonpea genome has led to the development of various genomic resources including molecular markers, transcript sequences and comprehensive genetic maps. Mapping of some important traits including resistance to Fusarium wilt and sterility mosaic disease, fertility restoration, determinacy with other agronomically important traits have paved the way for applying genomics-assisted breeding (GAB) through marker assisted selection as well as genomic selection (GS). This would accelerate the development and improvement of both varieties and hybrids in pigeonpea. Particularly for hybrid breeding programme, mitochondrial genomes of cytoplasmic male sterile (CMS) lines, maintainers and hybrids have been sequenced to identify genes responsible for cytoplasmic male sterility. Furthermore, several diagnostic molecular markers have been developed to assess the purity of commercial hybrids. In summary, pigeonpea has become a genomic resources-rich crop and efforts have already been initiated to integrate these resources in pigeonpea breeding.
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Affiliation(s)
- Lekha Pazhamala
- International Crops Research Institute for the Semi-Arid TropicsPatancheru, India
| | - Rachit K. Saxena
- International Crops Research Institute for the Semi-Arid TropicsPatancheru, India
| | - Vikas K. Singh
- International Crops Research Institute for the Semi-Arid TropicsPatancheru, India
| | - C. V. Sameerkumar
- International Crops Research Institute for the Semi-Arid TropicsPatancheru, India
| | - Vinay Kumar
- International Crops Research Institute for the Semi-Arid TropicsPatancheru, India
| | - Pallavi Sinha
- International Crops Research Institute for the Semi-Arid TropicsPatancheru, India
| | - Kishan Patel
- International Crops Research Institute for the Semi-Arid TropicsPatancheru, India
| | - Jimmy Obala
- International Crops Research Institute for the Semi-Arid TropicsPatancheru, India
- African Centre for Crop Improvement, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-NatalScottsville, South Africa
| | - Seleman R. Kaoneka
- International Crops Research Institute for the Semi-Arid TropicsPatancheru, India
- African Centre for Crop Improvement, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-NatalScottsville, South Africa
| | - P. Tongoona
- African Centre for Crop Improvement, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-NatalScottsville, South Africa
| | - Hussein A. Shimelis
- African Centre for Crop Improvement, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-NatalScottsville, South Africa
| | | | - Damaris Odeny
- International Crops Research Institute for the Semi-Arid TropicsNairobi, Kenya
| | - Abhishek Rathore
- International Crops Research Institute for the Semi-Arid TropicsPatancheru, India
| | - P. S. Dharmaraj
- Agricultural Research Station, University of Agricultural SciencesGulbarga, India
| | - K. N. Yamini
- Department of Agricultural Biotechnology, Acharya N. G. Ranga Agricultural UniversityHyderabad, India
| | - Rajeev K. Varshney
- International Crops Research Institute for the Semi-Arid TropicsPatancheru, India
- School of Plant Biology and Institute of Agriculture, The University of Western AustraliaCrawley, WA, Australia
- *Correspondence: Rajeev K. Varshney, Center of Excellence in Genomics, International Crops Research Institute for the Semi-Arid Tropics, Building 300, Patancheru, Hyderabad 502324, India e-mail:
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