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Fonceka D, Tossim HA, Rivallan R, Vignes H, Lacut E, de Bellis F, Faye I, Ndoye O, Leal-Bertioli SCM, Valls JFM, Bertioli DJ, Glaszmann JC, Courtois B, Rami JF. Construction of chromosome segment substitution lines in peanut (Arachis hypogaea L.) using a wild synthetic and QTL mapping for plant morphology. PLoS One 2012; 7:e48642. [PMID: 23185268 PMCID: PMC3501512 DOI: 10.1371/journal.pone.0048642] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Accepted: 09/28/2012] [Indexed: 11/22/2022] Open
Abstract
Chromosome segment substitution lines (CSSLs) are powerful QTL mapping populations that have been used to elucidate the molecular basis of interesting traits of wild species. Cultivated peanut is an allotetraploid with limited genetic diversity. Capturing the genetic diversity from peanut wild relatives is an important objective in many peanut breeding programs. In this study, we used a marker-assisted backcrossing strategy to produce a population of 122 CSSLs from the cross between the wild synthetic allotetraploid (A. ipaënsis×A. duranensis)(4x) and the cultivated Fleur11 variety. The 122 CSSLs offered a broad coverage of the peanut genome, with target wild chromosome segments averaging 39.2 cM in length. As a demonstration of the utility of these lines, four traits were evaluated in a subset of 80 CSSLs. A total of 28 lines showed significant differences from Fleur11. The line×trait significant associations were assigned to 42 QTLs: 14 for plant growth habit, 15 for height of the main stem, 12 for plant spread and one for flower color. Among the 42 QTLs, 37 were assigned to genomic regions and three QTL positions were considered putative. One important finding arising from this QTL analysis is that peanut growth habit is a complex trait that is governed by several QTLs with different effects. The CSSL population developed in this study has proved efficient for deciphering the molecular basis of trait variations and will be useful to the peanut scientific community for future QTL mapping studies.
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Affiliation(s)
| | | | | | | | | | | | - Issa Faye
- ISRA, Centre National de Recherche Agronomique, Bambey, Sénégal
| | | | | | - José F. M. Valls
- Embrapa Recursos Genéticos e Biotecnologia, Brasilia, Distrito Federal, Brazil
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Fonceka D, Tossim HA, Rivallan R, Vignes H, Faye I, Ndoye O, Moretzsohn MC, Bertioli DJ, Glaszmann JC, Courtois B, Rami JF. Fostered and left behind alleles in peanut: interspecific QTL mapping reveals footprints of domestication and useful natural variation for breeding. BMC PLANT BIOLOGY 2012; 12:26. [PMID: 22340522 PMCID: PMC3312858 DOI: 10.1186/1471-2229-12-26] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Accepted: 02/17/2012] [Indexed: 05/18/2023]
Abstract
BACKGROUND Polyploidy can result in genetic bottlenecks, especially for species of monophyletic origin. Cultivated peanut is an allotetraploid harbouring limited genetic diversity, likely resulting from the combined effects of its single origin and domestication. Peanut wild relatives represent an important source of novel alleles that could be used to broaden the genetic basis of the cultigen. Using an advanced backcross population developed with a synthetic amphidiploid as donor of wild alleles, under two water regimes, we conducted a detailed QTL study for several traits involved in peanut productivity and adaptation as well as domestication. RESULTS A total of 95 QTLs were mapped in the two water treatments. About half of the QTL positive effects were associated with alleles of the wild parent and several QTLs involved in yield components were specific to the water-limited treatment. QTLs detected for the same trait mapped to non-homeologous genomic regions, suggesting differential control in subgenomes as a consequence of polyploidization. The noteworthy clustering of QTLs for traits involved in seed and pod size and in plant and pod morphology suggests, as in many crops, that a small number of loci have contributed to peanut domestication. CONCLUSION In our study, we have identified QTLs that differentiated cultivated peanut from its wild relatives as well as wild alleles that contributed positive variation to several traits involved in peanut productivity and adaptation. These findings offer novel opportunities for peanut improvement using wild relatives.
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Affiliation(s)
- Daniel Fonceka
- Cirad, UMR AGAP, TA A108/3, Avenue Agropolis, Montpellier F-34398, France
| | | | - Ronan Rivallan
- Cirad, UMR AGAP, TA A108/3, Avenue Agropolis, Montpellier F-34398, France
| | - Hélène Vignes
- Cirad, UMR AGAP, TA A108/3, Avenue Agropolis, Montpellier F-34398, France
| | - Issa Faye
- ISRA/Ceraas, Route de Khombole, BP 3320, Thiès Escale, Senegal
| | - Ousmane Ndoye
- ISRA/Ceraas, Route de Khombole, BP 3320, Thiès Escale, Senegal
| | - Márcio C Moretzsohn
- Embrapa Recursos Genéticos e Biotecnologia, C.P. 02372, CEP 70.770-900 Brasilia, DF, Brazil
| | - David J Bertioli
- Universidade de Brasília, Campus Universitário, CEP 70.910-900 Brasília, DF, Brazil
| | | | - Brigitte Courtois
- Cirad, UMR AGAP, TA A108/3, Avenue Agropolis, Montpellier F-34398, France
| | - Jean-François Rami
- Cirad, UMR AGAP, TA A108/3, Avenue Agropolis, Montpellier F-34398, France
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Tiwari S, Mishra DK, Chandrasekhar K, Singh PK, Tuli R. Expression of δ-endotoxin Cry1EC from an inducible promoter confers insect protection in peanut (Arachis hypogaea L.) plants. PEST MANAGEMENT SCIENCE 2011; 67:137-45. [PMID: 20981728 DOI: 10.1002/ps.2041] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
BACKGROUND Spodoptera litura (F.) is a polyphagous foliage insect and a major pest on peanut (Arachis hypogaea L.). Constitutive expression of δ-endotoxin Cry1EC gives protection against S. litura, as reported earlier. In this study, insect bites and salicylic acid induced high-level expression of Cry1EC was achieved in peanut. In order to achieve this, the expression of pathogenesis responsive promoter PR-1a was enhanced by placing it downstream of the CaMV35S promoter in the pCAMBIA 1300 backbone. The resultant promoter CaMV35S(r)PR-1a expressed a high level of insecticidal δ-endotoxin Cry1EC. The Gus expression under the control of CaMV35S(r)PR-1a served as a convenient marker for evaluation of promoter response to different treatments. RESULTS Transgenic events that showed a very low level of uninduced expression and no expression in seeds were selected. The Cry1EC expression in leaves increased nearly eightfold in the selected event, following induction by salicylic acid. Both the salicylic-acid-treated and the S. litura-bitten leaves showed the highest expression after 2 days. Leaves from salicylic-acid-induced transgenic plants caused 100% mortality of S. litura at all stages of larval development. CONCLUSION The results suggest that high expression of inducible promoters provides a good strategy for the development of safer transgenic food and feed crops.
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Affiliation(s)
- Siddharth Tiwari
- National Agri-Food Biotechnology Institute, Department of Biotechnology, Govt of India, Mohali, Punjab, India
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Anisimova IN, Tumanova LG, Gavrilova VA, Dyagileva AV, Pasha LI, Mitin VA, Timofeyeva GI. Genomic instability in sunflower interspecific hybrids. RUSS J GENET+ 2009. [DOI: 10.1134/s1022795409080079] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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