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Zierer W, Anjanappa RB, Lamm CE, Chang SH, Gruissem W, Sonnewald U. A promoter toolbox for tissue-specific expression supporting translational research in cassava ( Manihot esculenta). FRONTIERS IN PLANT SCIENCE 2022; 13:1042379. [PMID: 36605961 PMCID: PMC9807883 DOI: 10.3389/fpls.2022.1042379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Accepted: 11/18/2022] [Indexed: 06/17/2023]
Abstract
There is an urgent need to stimulate agricultural output in many tropical and subtropical countries of the world to combat hunger and malnutrition. The starchy crop cassava (Manihot esculenta), growing even under sub-optimal conditions, is a key staple food in these regions, providing millions of people with food. Cassava biotechnology is an important technique benefiting agricultural progress, but successful implementation of many biotechnological concepts depends on the availability of the right spatiotemporal expression tools. Yet, well-characterized cassava promoters are scarce in the public domain. In this study, we investigate the promoter activity and tissue specificity of 24 different promoter elements in stably transformed cassava plants. We show that many of the investigated promoters, especially from other species, have surprisingly low activity and/or tissue specificity, but feature several promoter sequences that can drive tissue-specific expression in either autotrophic-, transport- or storage tissues. We especially highlight pAtCAB1, pMePsbR, and pSlRBCS2 as strong and specific source promoters, pAtSUC2, pMeSWEET1-like, and pMeSUS1 as valuable tools for phloem and phloem parenchyma expression, and pStB33, pMeGPT, pStGBSS1, as well as pStPatatin Class I, as strong and specific promoters for heterotrophic storage tissues. We hope that the provided information and sequences prove valuable to the cassava community by contributing to the successful implementation of biotechnological concepts aimed at the improvement of cassava nutritional value and productivity.
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Affiliation(s)
- Wolfgang Zierer
- Biochemistry, Department of Biology, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Ravi Bodampalli Anjanappa
- Plant Biotechnology, Department of Biology, Eidgenössische Technische Hochschule (ETH) Zurich, Zurich, Switzerland
| | - Christian Erwin Lamm
- Biochemistry, Department of Biology, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - Shu-Heng Chang
- Advanced Plant Biotechnology Center, National Chung Hsing University, Taichung, Taiwan
| | - Wilhelm Gruissem
- Plant Biotechnology, Department of Biology, Eidgenössische Technische Hochschule (ETH) Zurich, Zurich, Switzerland
- Advanced Plant Biotechnology Center, National Chung Hsing University, Taichung, Taiwan
| | - Uwe Sonnewald
- Biochemistry, Department of Biology, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany
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Rauwane ME, Odeny DA, Millar I, Rey C, Rees J. The early transcriptome response of cassava (Manihot esculenta Crantz) to mealybug (Phenacoccus manihoti) feeding. PLoS One 2018; 13:e0202541. [PMID: 30133510 PMCID: PMC6105004 DOI: 10.1371/journal.pone.0202541] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 08/06/2018] [Indexed: 11/18/2022] Open
Abstract
The mealybug, Phenacoccus manihoti, is a leading pest of cassava (Manihot esculenta Crantz), damaging this crop globally. Although the biological control of this mealybug using natural predators has been established, resistance breeding remains an important means of control. Understanding plant responses to insect herbivory, by determining and identifying differentially expressed genes (DEGs), is a vital step towards the understanding of molecular mechanisms of defence responses in plants and the development of resistant cultivars by gene editing. Morphological and molecular analysis confirmed the mealybug identity as Phenacoccus manihoti (Matile-Ferrero). The transcriptome response of the green mite resistant cassava genotype AR23.1 was compared to P40/1 with no known resistance at 24 and 72 hours of mealybug infestation compared to non-infested mock. A total of 301 and 206 genes were differentially expressed at 24 and 72 of mealybug infestation for AR23.1 and P40/1 genotypes respectively, using a log2 fold change and P-value ≤ 0.05. Gene ontology functional classification revealed an enrichment of genes in the secondary metabolic process category in AR23.1 in comparison with P40/1, while genes in the regulation of molecular function, cellular component biogenesis and electron carrier categories were more significantly enriched in P40/1 than in AR23.1. Biological pathway analysis, based on KEGG, revealed a significant enrichment of plant-pathogen interaction and plant hormonal signal transduction pathways for a cohort of up-regulated and down-regulated DEGs in both genotypes. Defence-related genes such as 2-oxogluterate, gibberellin oxidase and terpene synthase proteins were only induced in genotype AR23.1 and not in P40/1, and subsequently validated by RT-qPCR. The study revealed a difference in response to mealybug infestation in the two genotypes studied, with AR23.1 showing a higher number of differentially expressed transcripts post mealybug infestation at 24 and 72 hours. Candidate defence-related genes that were overexpressed in the AR23.1 genotype post mealybug infestation will be useful in future functional studies towards the control of mealybugs.
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Affiliation(s)
- Molemi E. Rauwane
- Biotechnology Platform, Agricultural Research Council, Onderstepoort, South Africa
- University of the Witwatersrand, Johannesburg, South Africa
| | | | - Ian Millar
- Biosystematics Division, Plant Protection Research Institute, Agricultural Research Council, Queenswood, Pretoria, South Africa
| | - Chrissie Rey
- University of the Witwatersrand, Johannesburg, South Africa
| | - Jasper Rees
- Biotechnology Platform, Agricultural Research Council, Onderstepoort, South Africa
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Ramírez E, Szurek B, Lopez Carrascal CE. Factores que afectan la expresión transitoria del gen GUS en yuca (Manihot esculenta Crantz). REVISTA COLOMBIANA DE BIOTECNOLOGÍA 2018. [DOI: 10.15446/rev.colomb.biote.v20n2.77063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
La expresión transitoria es una métodología ampliamente utilizada para el estudio de genes. Sin embargo, hasta la fecha no existe un reporte en donde se utilice esta técnica en hojas de yuca de plantas adultas. Por esta razón este trabajo se centró en la determinación de algunos parámetros críticos para la expresión transitoria del gen GUS en yuca como son: la metodología para introducir la bacteria, la cepa de Agrobacterium, el tiempo post-inoculación, la introducción del gen VirG y la expresión del gen GUS en algunas variedades de yuca. Los resultados indicaron niveles más altos de expresión del gen GUS entre 5-7 días post-inoculación (dpi), agroinfiltrando con la cepa GV3101 y un incremento en la virulencia de esta cepa mediante la introducción del gen VirG. Por último se observaron diferentes niveles de expresión del gen GUS entre las variedades de yuca evaluadas, lo que indica que el factor genético es clave en la eficiencia de la agroinfiltración en este cultivo.
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Chavarriaga-Aguirre P, Prías M, López D, Ortiz D, Toro-Perea N, Tohme J. Molecular analysis of the expression of a crtB transgene and the endogenous psy2-y 1 and psy2-y 2 genes of cassava and their effect on root carotenoid content. Transgenic Res 2017; 26:639-651. [PMID: 28779475 DOI: 10.1007/s11248-017-0037-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 07/23/2017] [Indexed: 10/19/2022]
Abstract
A conventional breeding program was established to transfer the bacterial phytoene synthase transgene-crtB-from a transgenic, white-rooted cassava to yellow-rooted cassava plants carrying the endogenous phytoene synthase alleles named psy2-y 1 and/or psy2-y 2. Combining endogenous phytoene synthase enzymes (PSYs) with CRTB in a single cassava plant would allow the molecular dissection of individual allele contributions to carotenoid synthesis and/or accumulation in cassava roots. The simultaneous expression of the crtB transgene and psy2-y 2 in individuals planted in the field coincided with higher total, HPLC-quantified carotenoid content in roots, although the variability among replications (plants) precluded the detection of statistically significant differences. Nevertheless, the highest total carotenoid content in roots within a family coincided with one individual of the F1 progeny carrying both psy2-y 2 and crtB genes. The results also indicated the presence of at least one more key gene-different from psy or crtB-which too is necessary for the synthesis and/or accumulation of Pro-Vitamin A carotenoids in cassava roots.
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Affiliation(s)
- Paul Chavarriaga-Aguirre
- Agrobiodiversity Research Area, International Center for Tropical Agriculture-CIAT, AA 6713, Cali, Colombia.
| | - Mónica Prías
- Agrobiodiversity Research Area, International Center for Tropical Agriculture-CIAT, AA 6713, Cali, Colombia
| | - Danilo López
- Syngenta S.A., Colombia, Calle 64 N #5BN-146, Local 104C, Edificio Centroempresa, Cali, Colombia
| | - Darwin Ortiz
- Department of Food Science, Purdue University, West Lafayette, IN, USA
| | | | - Joe Tohme
- Agrobiodiversity Research Area, International Center for Tropical Agriculture-CIAT, AA 6713, Cali, Colombia
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Chaparro Giraldo A. LA INGENIERÍA GENÉTICA DE PLANTAS EN COLOMBIA: UN CAMINO EN CONSTRUCCIÓN. ACTA BIOLÓGICA COLOMBIANA 2014. [DOI: 10.15446/abc.v20n2.43412] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
<p>Se reportan en Colombia trabajos en el desarrollo de líneas genéticamente modificadas (GM) de arroz, yuca, algodón, papa, caña de azúcar, café, maíz, soya, estevia y crisantemo, por parte de centros centros de investigación (CIAT, CENICAÑA, CENICAFE, CIB, CORPOICA) y tres universidades (Universidad Nacional de Colombia, Universidad Javeriana, Universidad de Antioquia). Para llegar a la liberación comercial de variedades GM, se requiere de verdaderas políticas públicas en ciencia y tecnología, que den financiación suficiente y oportuna, así como resolver problemas con la maraña de patentes que limitan o impiden el desarrollo de innovaciones biotecnológicas, además de un paquete regulatorio, que incrementa significativamente los costos de desarrollo. </p><p><strong>ABSTRACT</strong> <!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:HyphenationZone>21</w:HyphenationZone> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:DoNotPromoteQF/> <w:LidThemeOther>ES-CO</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> 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Name="TOC Heading"/> </w:LatentStyles> </xml><![endif]--><!--[if !supportAnnotations]--><!--[endif]--><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} </style> <![endif]--></p><p style="font-size: 12.0pt; line-height: 200%; font-family: 'Times New Roman','serif'; mso-ansi-language: EN-US;" lang="EN-US"><span style="font-size: 12.0pt; line-height: 200%; font-family: 'Times New Roman','serif'; mso-ansi-language: EN-US;" lang="EN-US">Here in Colombia have been reported efforts on the development of genetically modified (GM) crops, like: rice, cassava, cotton, potato, sugar cane, coffee, corn, soy, stevia and chrysanthemum, by five research center (CIAT, CENICAÑA, CENICAFE, CIB, CORPOICA) and three universities (Universidad Nacional de Colombia, Universidad Javeriana, Universidad de Antioquia). To get to the commercial release of GM varieties, real public policies on science and technology are needed, giving sufficient and timely funding, as well as to solve problems with the tangle of patents that limit or prevent the development of biotechnological innovations, and it is also required suffice funding to go through the regulatory issues, which significantly increase the cost of those developments.</span> </p><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:HyphenationZone>21</w:HyphenationZone> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:DoNotPromoteQF/> <w:LidThemeOther>ES-CO</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> 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Santos KS, Gadermaier G, Vejvar E, Arcuri HA, Galvão CE, Yang AC, Resende VMF, Martins CDO, Himly M, Mari A, Liso M, Pomponi D, Breiteneder H, Wagner S, Kalil J, Ferreira F, Castro FFM. Novel allergens from ancient foods: Man e 5 from manioc (Manihot esculenta Crantz) cross reacts with Hev b 5 from latex. Mol Nutr Food Res 2013; 57:1100-9. [PMID: 23526605 DOI: 10.1002/mnfr.201200433] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 11/10/2012] [Accepted: 01/02/2013] [Indexed: 11/06/2022]
Abstract
SCOPE Manioc (Manihot esculenta) is a tuber mainly consumed in the Southern Hemisphere and used worldwide by food and chemistry industry. We aimed to recombinantly produce and characterize the first manioc allergen and evaluate its IgE reactivity in sera of Brazilian and Italian patients. METHODS AND RESULTS The molecule, termed Man e5, was expressed in E. coli, characterized by amino acid analysis, mass spectrometry, circular dichroism, HPLC, and dynamic light scattering. A tertiary structural model of the protein was produced using bioinformatics and susceptibility to pepsin digestion was analyzed in vitro. Based on its high content of charged residues, heat stability, flexibility and lack of secondary structure elements, the allergen was determined a member of the intrinsically disordered protein family. Brazilian patients were selected based on manioc allergy and Italians based on latex allergy and sensitization to Hev b 5.71% of Brazilians and 40% of Italians were in vitro IgE positive to Man e5. Cross-inhibition assays suggest a possible involvement of this allergen in the latex-fruit syndrome. CONCLUSION Man e5, the first purified allergen from manioc demonstrates IgE cross-reactivity with Hev b 5. Data suggest Hev b 5 might act as primary sensitizer and could therefore lead to allergic manifestations upon manioc consumption without prior exposition.
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Affiliation(s)
- Keity Souza Santos
- Laboratory of Clinical Immunology and Allergy-LIM60, Division of Clinical Immunology and Allergy, Department of Medicine, University of São Paulo School of Medicine, FMUSP, São Paulo, Brazil.
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Koehorst-van Putten HJJ, Wolters AMA, Pereira-Bertram IM, van den Berg HHJ, van der Krol AR, Visser RGF. Cloning and characterization of a tuberous root-specific promoter from cassava (Manihot esculenta Crantz). PLANTA 2012; 236:1955-1965. [PMID: 23132522 DOI: 10.1007/s00425-012-1796-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Accepted: 10/23/2012] [Indexed: 06/01/2023]
Abstract
In order to obtain a tuberous root-specific promoter to be used in the transformation of cassava, a 1,728 bp sequence containing the cassava granule-bound starch synthase (GBSSI) promoter was isolated. The sequence proved to contain light- and sugar-responsive cis elements. Part of this sequence (1,167 bp) was cloned into binary vectors to drive expression of the firefly luciferase gene. Cassava cultivar Adira 4 was transformed with this construct or a control construct in which the luciferase gene was cloned behind the 35S promoter. Luciferase activity was measured in leaves, stems, roots and tuberous roots. As expected, the 35S promoter induced luciferase activity in all organs at similar levels, whereas the GBSSI promoter showed very low expression in leaves, stems and roots, but very high expression in tuberous roots. These results show that the cassava GBSSI promoter is an excellent candidate to achieve tuberous root-specific expression in cassava.
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Affiliation(s)
- Herma J J Koehorst-van Putten
- Wageningen UR Plant Breeding, Wageningen University and Research Center, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands.
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Liu J, Zheng Q, Ma Q, Gadidasu KK, Zhang P. Cassava genetic transformation and its application in breeding. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2011; 53:552-69. [PMID: 21564542 DOI: 10.1111/j.1744-7909.2011.01048.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
As a major source of food, cassava (Manihot esculenta Crantz) is an important root crop in the tropics and subtropics of Africa and Latin America, and serves as raw material for the production of starches and bioethanol in tropical Asia. Cassava improvement through genetic engineering not only overcomes the high heterozygosity and serious trait separation that occurs in its traditional breeding, but also quickly achieves improved target traits. Since the first report on genetic transformation in cassava in 1996, the technology has gradually matured over almost 15 years of development and has overcome cassava genotype constraints, changing from mode cultivars to farmer-preferred ones. Significant progress has been made in terms of an increased resistance to pests and diseases, biofortification, and improved starch quality, building on the fundamental knowledge and technologies related to planting, nutrition, and the processing of this important food crop that has often been neglected. Therefore, cassava has great potential in food security and bioenergy development worldwide.
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Affiliation(s)
- Jia Liu
- National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China
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Bull SE, Ndunguru J, Gruissem W, Beeching JR, Vanderschuren H. Cassava: constraints to production and the transfer of biotechnology to African laboratories. PLANT CELL REPORTS 2011; 30:779-87. [PMID: 21212961 DOI: 10.1007/s00299-010-0986-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Revised: 12/16/2010] [Accepted: 12/16/2010] [Indexed: 05/10/2023]
Abstract
Knowledge and technology transfer to African institutes is an important objective to help achieve the United Nations Millennium Development Goals. Plant biotechnology in particular enables innovative advances in agriculture and industry, offering new prospects to promote the integration and dissemination of improved crops and their derivatives from developing countries into local markets and the global economy. There is also the need to broaden our knowledge and understanding of cassava as a staple food crop. Cassava (Manihot esculenta Crantz) is a vital source of calories for approximately 500 million people living in developing countries. Unfortunately, it is subject to numerous biotic and abiotic stresses that impact on production, consumption, marketability and also local and country economics. To date, improvements to cassava have been led via conventional plant breeding programmes, but with advances in molecular-assisted breeding and plant biotechnology new tools are being developed to hasten the generation of improved farmer-preferred cultivars. In this review, we report on the current constraints to cassava production and knowledge acquisition in Africa, including a case study discussing the opportunities and challenges of a technology transfer programme established between the Mikocheni Agricultural Research Institute in Tanzania and Europe-based researchers. The establishment of cassava biotechnology platform(s) should promote research capabilities in African institutions and allow scientists autonomy to adapt cassava to suit local agro-ecosystems, ultimately serving to develop a sustainable biotechnology infrastructure in African countries.
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Affiliation(s)
- Simon E Bull
- Department of Biology & Biochemistry, University of Bath, Claverton Down, Bath, Avon, BA2 7AY, UK
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Welsch R, Arango J, Bär C, Salazar B, Al-Babili S, Beltrán J, Chavarriaga P, Ceballos H, Tohme J, Beyer P. Provitamin A accumulation in cassava (Manihot esculenta) roots driven by a single nucleotide polymorphism in a phytoene synthase gene. THE PLANT CELL 2010; 22:3348-56. [PMID: 20889914 PMCID: PMC2990137 DOI: 10.1105/tpc.110.077560] [Citation(s) in RCA: 145] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2010] [Revised: 08/17/2010] [Accepted: 09/20/2010] [Indexed: 05/18/2023]
Abstract
Cassava (Manihot esculenta) is an important staple crop, especially in the arid tropics. Because roots of commercial cassava cultivars contain a limited amount of provitamin A carotenoids, both conventional breeding and genetic modification are being applied to increase their production and accumulation to fight vitamin A deficiency disorders. We show here that an allelic polymorphism in one of the two expressed phytoene synthase (PSY) genes is capable of enhancing the flux of carbon through carotenogenesis, thus leading to the accumulation of colored provitamin A carotenoids in storage roots. A single nucleotide polymorphism present only in yellow-rooted cultivars cosegregates with colored roots in a breeding pedigree. The resulting amino acid exchange in a highly conserved region of PSY provides increased catalytic activity in vitro and is able to increase carotenoid production in recombinant yeast and Escherichia coli cells. Consequently, cassava plants overexpressing a PSY transgene produce yellow-fleshed, high-carotenoid roots. This newly characterized PSY allele provides means to improve cassava provitamin A content in cassava roots through both breeding and genetic modification.
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Affiliation(s)
- Ralf Welsch
- University of Freiburg, Faculty of Biology, D79104 Freiburg, Germany
| | - Jacobo Arango
- University of Freiburg, Faculty of Biology, D79104 Freiburg, Germany
| | - Cornelia Bär
- University of Freiburg, Faculty of Biology, D79104 Freiburg, Germany
| | - Bertha Salazar
- University of Freiburg, Faculty of Biology, D79104 Freiburg, Germany
| | - Salim Al-Babili
- University of Freiburg, Faculty of Biology, D79104 Freiburg, Germany
| | - Jesús Beltrán
- International Center for Tropical Agriculture, Apartado Aéreo 6713, Cali, Colombia
| | - Paul Chavarriaga
- International Center for Tropical Agriculture, Apartado Aéreo 6713, Cali, Colombia
| | - Hernan Ceballos
- International Center for Tropical Agriculture, Apartado Aéreo 6713, Cali, Colombia
| | - Joe Tohme
- International Center for Tropical Agriculture, Apartado Aéreo 6713, Cali, Colombia
| | - Peter Beyer
- University of Freiburg, Faculty of Biology, D79104 Freiburg, Germany
- Address correspondence to
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