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Braz GT, Van-Lume B, de Resende KFM, Cardoso FP, Oliveira L, de Andrade MJG, Souza G, Torres GA. Cytomolecular trends in Chamaecrista Moench (Caesalpinioideae, Leguminosae) diversification. Genetica 2024; 152:51-61. [PMID: 38381186 DOI: 10.1007/s10709-024-00205-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 02/14/2024] [Indexed: 02/22/2024]
Abstract
Chamaecrista is a Pantropical legume genus of the tribe Cassieae, which includes six other genera. In contrast to most of the other Cassieae genera, Chamaecrista shows significant variability in chromosome number (from 2n = 14 to 2n = 56), with small and morphologically similar chromosomes. Here, we performed a new cytomolecular analysis on chromosome number, genome size, and rDNA site distribution in a molecular phylogenetic perspective to interpret the karyotype trends of Chamaecrista and other two genera of Cassieae, seeking to understand their systematics and evolution. Our phylogenetic analysis revealed that Chamaecrista is monophyletic and can be divided into four major clades corresponding to the four sections of the genus. Chromosome numbers ranged from 2n = 14, 16 (section Chamaecrista) to 2n = 28 (sections Absus, Apoucouita, and Baseophyllum). The number of 5S and 35S rDNA sites varied between one and three pairs per karyotype, distributed on different chromosomes or in synteny, with no obvious phylogenetic significance. Our data allowed us to propose x = 7 as the basic chromosome number of Cassieae, which was changed by polyploidy generating x = 14 (sections Absus, Apoucouita, and Baseophyllum) and by ascending dysploidy to x = 8 (section Chamaecrista). The DNA content values supported this hypothesis, with the genomes of the putative tetraploids being larger than those of the putative diploids. We hypothesized that ascending dysploidy, polyploidy, and rDNA amplification/deamplification are the major events in the karyotypic diversification of Chamaecrista. The chromosomal marks characterized here may have cytotaxonomic potential in future studies.
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Affiliation(s)
- Guilherme Tomaz Braz
- Departamento de Biologia Vegetal, Universidade Estadual de Campinas, Campinas, São Paulo, Brasil.
| | - Brena Van-Lume
- Programa de Pós-graduação em Biologia Vegetal, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Pernambuco, Brasil
| | | | - Felipe Pereira Cardoso
- Departamento de Biologia, Instituto de Ciências Naturais, Universidade Federal de Lavras, Lavras, Minas Gerais, Brasil
| | - Ludmila Oliveira
- Biology Centre, Institute of Plant Molecular Biology, Czech Academy of Sciences, České Budějovice, Czech Republic
| | - Maria José Gomes de Andrade
- Programa de Pós-graduação em Biodiversidade Vegetal, Departamento de Educação, Campus VIII, Universidade do Estado da Bahia, Bahia, Paulo Afonso, Brasil
| | - Gustavo Souza
- Programa de Pós-graduação em Biologia Vegetal, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Pernambuco, Brasil
| | - Giovana Augusta Torres
- Departamento de Biologia, Instituto de Ciências Naturais, Universidade Federal de Lavras, Lavras, Minas Gerais, Brasil
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Soares NR, Correa CTR, da Silva JC, da Silva Negreiros JR, Techio VH, Torres GA. Comparative cytogenetics of three economically important Piper L. species from the Brazilian Amazon. Protoplasma 2022; 259:1099-1108. [PMID: 34762169 DOI: 10.1007/s00709-021-01721-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 11/01/2021] [Indexed: 06/13/2023]
Abstract
The species Piper hispidinervum, Piper aduncum, and Piper affinis hispidinervum have essential oils with high levels of safrole, dillapiole, and sarisan, respectively. Safrole is important for pharmaceutical and chemical industries, while dillapiole and sarisan are promising compounds to control insects and fungi. These species are very similar morphologically and their taxonomy is controversial. Divergent hypotheses consider P. aduncum and P. hispidinervum either as a single species or as distinct taxa, while P. affinis hispidinervum is inferred to be a natural hybrid or a chemotype of P. hispidinervum. Delimiting the taxonomic boundaries would be helpful for germplasm conservation and breeding programs. This study aimed to undertake a detailed analysis of P. aduncum, P. hispidinervum, and P. affinis hispidinervum karyotype and rDNA sites. Genomic in situ hybridization (GISH) was used to establish genomic homology among species and to test the natural hybridization hypothesis for origin of P. affinis hispidinervum. Karyotype traits were similar for all three species: 2n = 26 small chromosomes, predominantly metacentric. All three species exhibited CMA+ bands on the secondary constriction of chromosome pair 4. A size-heteromorphic 35S rDNA site was co-localized with the CMA+ band. A 5S rDNA site was located in the proximal region of chromosome pair 7. The patterns of genomic hybridization revealed that the repetitive DNA fraction of the species is highly similar in terms of proportion of genome, sequence type, and distribution. Our findings did not allow us to differentiate the three species and point to the importance of deeper genomic studies to elucidate the taxonomic controversy.
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Affiliation(s)
- Nina Reis Soares
- Departamento de Biologia, Instituto de Ciências Naturais, Universidade Federal de Lavas, Lavras, Minas Gerais, Brazil
| | - Caio Túlio Rodrigues Correa
- Departamento de Biologia, Instituto de Ciências Naturais, Universidade Federal de Lavas, Lavras, Minas Gerais, Brazil
| | - Jhonata Costa da Silva
- Departamento de Biologia, Instituto de Ciências Naturais, Universidade Federal de Lavas, Lavras, Minas Gerais, Brazil
| | | | - Vânia Helena Techio
- Departamento de Biologia, Instituto de Ciências Naturais, Universidade Federal de Lavas, Lavras, Minas Gerais, Brazil
| | - Giovana Augusta Torres
- Departamento de Biologia, Instituto de Ciências Naturais, Universidade Federal de Lavas, Lavras, Minas Gerais, Brazil.
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Oliveira LC, Torres GA. Plant centromeres: genetics, epigenetics and evolution. Mol Biol Rep 2018; 45:1491-1497. [DOI: 10.1007/s11033-018-4284-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 07/26/2018] [Indexed: 12/20/2022]
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Oliveira GKD, Oliveira LC, Torres GA. Distribuição de sequências subteloméricas no genoma C de Solanum. Semin Cienc Biol Saude 2018. [DOI: 10.5433/1679-0367.2017v38n1suplp154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
As sequências subteloméricas CL14 e CL34 foram identificadas em Solanum. tuberosum (genoma A) como longos arranjos adjacentes aos telômeros, sendo localizadas exclusivamente na região terminal dos cromossomos. CL14 está presente também em outras espécies do genoma A e também nos genomas B, P, T e E do gênero, enquanto CL34 foi encontrada apenas em espécies do genoma A. Foi mostrado que essas sequências são muito dinâmicas e evoluem rapidamente nos genomas estudados, mas não foi feita ainda a caracterização nos genomas C e D presentes apenas em espécies poliploides. Esse trabalho teve por objetivo verificar a presença e distribuição dessas duas sequências no genoma C, na espécie alopoliploide Solanum agrimonifolium (2n=4x=48; AACC). Os cromossomos metafásicos foram hibridizados com as sondas CL14 e CL34, marcadas com biotina e digoxigenina. A detecção das sondas foi feita com o uso dos anticorpos antibiotina e antidigoxigenina, conjugados com fluorocromos FITC e rodamina, respectivamente, e os cromossomos contracorados com DAPI (diamidinefenilindole). A sonda CL14 foi mais abundante, estando presente nas regiões terminais de 17 pares de cromossomos, enquanto CL34 foi observada em 6 pares. Foi observada co-localização das duas sondas em três extremidades cromossômicas. Considerando que o genoma de S. agrimonifolium apresenta 12 pares de genoma A e 12 do genoma C, podemos inferir que o genoma C também apresenta a sequência CL14 nos subtelômeros, o que também evidencia a origem mais antiga dessa sequência. Uma característica inédita observada em S. agrimonifolium foi a presença de CL14 na região intersticial de um par cromossômico. Isso pode estar relacionado à fusão de cromossomos com posterior preservação das sequências subteloméricas. A repetição CL34 observada provavelmente pertence apenas ao genoma A, estando ausente no genoma C, assim como nos genomas previamente estudados. Os resultados confirmam que CL14 é uma repetição mais ancestral, abundante e com ampla distribuição no gênero Solanum, enquanto CL34 é relativamente mais recente. Apoio Financeiro: FAPEMIG, CAPES e CNPq
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Torres GA, Sarria GA, Martinez G, Varon F, Drenth A, Guest DI. Bud Rot Caused by Phytophthora palmivora: A Destructive Emerging Disease of Oil Palm. Phytopathology 2016; 106:320-329. [PMID: 26714102 DOI: 10.1094/phyto-09-15-0243-rvw] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Oomycetes from the genus Phytophthora are among the most important plant pathogens in agriculture. Epidemics caused by P. infestans precipitated the great Irish famine and had a major impact on society and human history. In the tropics, P. palmivora is a pathogen of many plant species including cacao (Theobroma cacao), citrus (Citrus sp.), durian (Durio zibethines), jackfruit (Artrocarpus heterophyllus), rubber (Hevea brasiliensis), and several palm species including coconut (Cocos nucifera), and the African oil palm (Elaeis guineensis) as determined recently. The first localized epidemics of bud rot in oil palm in Colombia were reported in 1964. However, recent epidemics of bud rot have destroyed more than 70,000 ha of oil palm in the Western and Central oil palm growing regions of Colombia. The agricultural, social, and economic implications of these outbreaks have been significant in Colombia. Identification of the pathogen after 100 years of investigating the disease in the world enabled further understanding of infection, expression of a range of symptoms, and epidemiology of the disease. This review examines the identification of P. palmivora as the cause of bud rot in Colombia, its epidemiology, and discusses the importance of P. palmivora as a major threat to oil palm plantings globally.
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Affiliation(s)
- G A Torres
- First, second, third, and fourth authors: Pests and Diseases Program, Colombian Oil Palm Research Centre, Cenipalma Bogota, Colombia; fifth author: Centre for Plant Science, The University of Queensland, Australia; and sixth author: Faculty of Agriculture and Environment, The University of Sydney, Australia
| | - G A Sarria
- First, second, third, and fourth authors: Pests and Diseases Program, Colombian Oil Palm Research Centre, Cenipalma Bogota, Colombia; fifth author: Centre for Plant Science, The University of Queensland, Australia; and sixth author: Faculty of Agriculture and Environment, The University of Sydney, Australia
| | - G Martinez
- First, second, third, and fourth authors: Pests and Diseases Program, Colombian Oil Palm Research Centre, Cenipalma Bogota, Colombia; fifth author: Centre for Plant Science, The University of Queensland, Australia; and sixth author: Faculty of Agriculture and Environment, The University of Sydney, Australia
| | - F Varon
- First, second, third, and fourth authors: Pests and Diseases Program, Colombian Oil Palm Research Centre, Cenipalma Bogota, Colombia; fifth author: Centre for Plant Science, The University of Queensland, Australia; and sixth author: Faculty of Agriculture and Environment, The University of Sydney, Australia
| | - A Drenth
- First, second, third, and fourth authors: Pests and Diseases Program, Colombian Oil Palm Research Centre, Cenipalma Bogota, Colombia; fifth author: Centre for Plant Science, The University of Queensland, Australia; and sixth author: Faculty of Agriculture and Environment, The University of Sydney, Australia
| | - D I Guest
- First, second, third, and fourth authors: Pests and Diseases Program, Colombian Oil Palm Research Centre, Cenipalma Bogota, Colombia; fifth author: Centre for Plant Science, The University of Queensland, Australia; and sixth author: Faculty of Agriculture and Environment, The University of Sydney, Australia
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Oliveira LC, de Oliveira MDSP, Davide LC, Torres GA. Karyotype and genome size in Euterpe Mart. (Arecaceae) species. Comp Cytogenet 2016; 10:17-25. [PMID: 27186334 PMCID: PMC4856922 DOI: 10.3897/compcytogen.v10i1.5522] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 10/06/2015] [Indexed: 06/05/2023]
Abstract
Euterpe (Martius, 1823), a genus from Central and South America, has species with high economic importance in Brazil, because of their palm heart and fruits, known as açaí berries. Breeding programs have been conducted to increase yield and establish cultivation systems to replace the extraction of wild material. These programs need basic information about the genome of these species to better explore the available genetic variability. The aim of this study was to compare Euterpe edulis (Martius, 1824), Euterpe oleracea (Martius, 1824) and Euterpe precatoria (Martius, 1842), with regard to karyotype, type of interphase nucleus and nuclear DNA amount. Metaphase chromosomes and interphase nuclei from root tip meristematic cells were obtained by the squashing technique and solid stained for microscope analysis. The DNA amount was estimated by flow cytometry. There were previous reports on the chromosome number of Euterpe edulis and Euterpe oleracea, but chromosome morphology of these two species and the whole karyotype of Euterpe precatoria are reported for the first time. The species have 2n=36, a number considered as a pleisomorphic feature in Arecoideae since the modern species, according to floral morphology, have the lowest chromosome number (2n=28 and 2n=30). The three Euterpe species also have the same type of interphase nuclei, classified as semi-reticulate. The species differed on karyotypic formulas, on localization of secondary constriction and genome size. The data suggest that the main forces driving Euterpe karyotype evolution were structural rearrangements, such as inversions and translocations that alter chromosome morphology, and either deletion or amplification that led to changes in chromosome size.
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Affiliation(s)
- Ludmila Cristina Oliveira
- Universidade Federal de Lavras, Campus Universitário, Caixa Postal 3037, CEP 37200-000, Lavras-MG, Brasil
| | | | - Lisete Chamma Davide
- Embrapa Amazônia Oriental, Trav. Dr. Enéas Pinheiro, s/n°, Bairro Marco, CEP 66095-100, Caixa Postal 48, Belém-PA, Brasil
| | - Giovana Augusta Torres
- Universidade Federal de Lavras, Campus Universitário, Caixa Postal 3037, CEP 37200-000, Lavras-MG, Brasil
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Nakamura AT, Simão E, Silva L, Torres GA. Origin of the subepidermal tissue in Piper L. leaves. BRAZ J BIOL 2015; 75:368-71. [PMID: 26132020 DOI: 10.1590/1519-6984.13713] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Accepted: 01/06/2014] [Indexed: 11/22/2022] Open
Abstract
Studies on the anatomy of Piper leaves demonstrate the presence of a subepidermal tissue distinct from the adjacent epidermis, which cells show thin walls and hyaline contents. Some authors consider such cells a hypodermal tissue, while others refer to them as components of a multiple epidermis. In this study, the nature of this subepidermal tissue was investigated through the analysis of leaf ontogeny in three Piper species. The analysis showed that the referred tissue originates from the ground meristem and, thus, should be considered a hypodermis. The studied species suggests that the role of the hypodermis would be to protect the photosynthetic apparatus from excess light, regulating the intensity of light reaching the chlorophyll parenchyma.
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Affiliation(s)
- A T Nakamura
- Instituto de Ciências Agrárias, Universidade Federal de Uberlândia, Monte Carmelo, MG, Brazil
| | - E Simão
- Instituto de Ciências Agrárias, Universidade Federal de Uberlândia, Monte Carmelo, MG, Brazil
| | - L Silva
- Departamento de Biologia, Universidade Federal de Lavras, Lavras, MG, Brazil
| | - G A Torres
- Departamento de Biologia, Universidade Federal de Lavras, Lavras, MG, Brazil
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Rocha LC, Bustamante FDO, Silveira RAD, Torres GA, Mittelmann A, Techio VH. Functional repetitive sequences and fragile sites in chromosomes of Lolium perenne L. Protoplasma 2015; 252:451-60. [PMID: 25141824 DOI: 10.1007/s00709-014-0690-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Accepted: 08/13/2014] [Indexed: 05/26/2023]
Abstract
Lolium perenne is considered a high-quality forage widely used in temperate regions to meet the shortage of forage during the winter. In this species, some peculiarities related to cytogenetic aspects have already been described, as the variability in number and position of 45S ribosomal DNA (rDNA) sites and the expression of fragile sites, which require further studies to support the understanding of their causes and consequences. In this way, this study aimed to evaluate the relationship between the expression of fragile sites and functional repetitive sequences (rDNA and telomeric) in chromosomes of diploid and polyploid cultivars of L. perenne. The techniques of FISH, Ag-NOR and fluorescence banding were used to assess the distribution of sites of 45S rDNA, 5S, telomeric sequences, and the transcriptional activity of the 45S ribosomal genes and the distribution of AT- and/or GC-rich sequences in L. perenne, respectively. There was variability in the number and location of 45S rDNA sites, which was not observed for 5S rDNA sites. One of the genotypes showed two 45S rDNA sites on the same chromosome, located in different chromosome arms. Breaks and gaps were found in 45S rDNA sites in most metaphases evaluated for both cultivars. Telomeric sequences were not detected at the end of the chromosomal fragments corresponding to the location of breaks at 45S sites. Apparently, the transcriptional activity was modified in fragile sites. Variation in the number and size of nucleoli, nucleolar fusions and dissociations were observed. All CMA(+) bands were colocalized with the 45S sites.
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Affiliation(s)
- Laiane Corsini Rocha
- Department of Biology, Federal University of Lavras, P.O. Box 3037, 37200-000, Lavras, Minas Gerais State, Brazil
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dos Reis GB, Mesquita AT, Torres GA, Andrade-Vieira LF, Pereira AV, Davide LC. Genomic homeology between Pennisetum purpureum and Pennisetum glaucum (Poaceae). Comp Cytogenet 2014; 8:199-209. [PMID: 25349671 PMCID: PMC4205489 DOI: 10.3897/compcytogen.v8i3.7732] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2014] [Accepted: 07/14/2014] [Indexed: 05/24/2023]
Abstract
The genus Pennisetum (Richard, 1805) includes two economically important tropical forage plants: Pennisetum purpureum (Schumacher, 1827) (elephant grass), with 2n = 4x = 28 chromosomes and genomes A'A'BB, and Pennisetum glaucum (Linnaeus, 1753) (pearl millet), with 2n = 2x = 14 chromosomes and genomes AA. The genetic proximity between them allows hybrids to be obtained (2n = 3x = 21) that yield forage of higher quality in relation to the parents. The study of genomic relationships provides subsidies for the knowledge about phylogenetic relations and evolution, and is useful in breeding programs seeking gene introgression. Concerning elephant grass and pearl millet, the homeology between the genomes A and A', and between these and the genome B, has been reported by conventional cytogenetic techniques. The objective of the present study was to demonstrate the degree of homeology between these genomes by means of genomic in situ hybridization (GISH). The results confirmed the homeology between the genomes A of pearl millet and A'B of elephant grass, and showed that there are differences in the distribution and proportion of homologous regions after hybridization. Discussion regarding the evolutionary origin of P. purpureum and P. glaucum was also included.
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Affiliation(s)
| | | | - Giovana Augusta Torres
- Departament of Biology, Federal University of Lavras, Zip Code 37200-000, Lavras, MG, Brazil
| | | | - Antônio Vander Pereira
- Laboratory of Plant Genetics, Brazilian Agricultural Research Corporation, Embrapa Dairy Cattle, Zip Code 36038-330, Juiz de Fora, MG, Brazil
| | - Lisete Chamma Davide
- Departament of Biology, Federal University of Lavras, Zip Code 37200-000, Lavras, MG, Brazil
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Torres GA, Sarria GA, Varon F, Coffey MD, Elliott ML, Martinez G. First Report of Bud Rot Caused by Phytophthora palmivora on African Oil Palm in Colombia. Plant Dis 2010; 94:1163. [PMID: 30743706 DOI: 10.1094/pdis-94-9-1163a] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A bud rot disease, referred to as "pudricion del cogollo" or PC (for its name in Spanish), is a major disease of oil palm in four production areas of Colombia. Even though the disease has been studied for more than 40 years in Central and South America, the causal agent remained unknown (1). Infection first develops in the palm heart (cogollo) above the meristematic zone. Initial external symptoms appear as necrotic lesions on the sides of the spear leaf (youngest, unexpanded leaf) and the sizes of the lesions remain static as tissues emerge, expand, and mature. Under favorable environmental conditions (temperature around 26°C and relative humidity above 80%), further rotting of the heart eventually destroys the bud. A baiting technique with papaya and cocoa fruits was successfully used to trap the causal agent from symptomatic spear leaf tissue collected from the provinces of Nariño and Santander (2), where the disease is severe. Small, triangular-shaped pieces were removed from healthy fruits that had been surface sterilized, and a corresponding piece of diseased oil palm tissue was inserted into the hole and sealed with the removed fruit tissue. The whole fruit was wrapped with plastic and incubated at 25°C. Once the fruit traps showed initial necrotic symptoms, fruit tissue from the advancing point of the lesions was plated on Phytophthora-selective media. Four isolates of Phytophtora palmivora, all A2 mating type, were obtained during this study and each presented similar white and depressed mycelium when grown on oatmeal agar (OMA) medium. Papillated, ellipsoidal sporangia with short pedicels had an average size of 37.1 (breadth) × 52.8 μm (length). Chlamydospores averaged 35.1 μm in diameter and were similar to those observed in diseased palm tissue. DNA from the Phytophthora isolates was used as a template for PCR using ITS1/ITS4 primers. BLASTn analysis of the ITS sequences (GenBank Accession No. GQ398157) showed 99.9% homology with P. palmivora. The sequences of the four isolates were identical. For pathogenicity testing, cultures were grown on OMA. Two milliliters of distilled water containing 40,000 sporangia were injected into the base of the spear leaf of 105 nursery palms; the same number of palms was injected with 2 ml of distillated water as controls. Initial PC symptoms were observed 3 to 4 days after inoculation on 85% of inoculated palms and 15% of these palms developed typical bud rot symptoms under favorable conditions. No symptoms were observed on the controls. The presence of Phytophthora was confirmed by light microscopy and P. palmivora was reisolated from symptomatic palms with the fruit-baiting technique. The presence of Phytophthora in the four Colombian growing areas was also confirmed using Agdia (Elkhart, IN) immunostrips followed by DNA extraction from the Immunostrip wick and ITS sequencing to confirm the species. To our knowledge, this is the first report of P. palmivora causing PC on oil palm in Colombia. References: (1) H. de Franqueville. Exp. Agric. 39:225, 2003. (2) G. Sarria et al. Rev. Palmas, Colombia. 29(3):31, 2008.
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Affiliation(s)
- G A Torres
- Colombian Oil Palm Research Center-Cenipalma, Bogota, Colombia
| | - G A Sarria
- Colombian Oil Palm Research Center-Cenipalma, Bogota, Colombia
| | - F Varon
- Colombian Oil Palm Research Center-Cenipalma, Bogota, Colombia
| | | | - M L Elliott
- University of Florida, Fort Lauderdale Research and Education Center, Fort Lauderdale
| | - G Martinez
- Colombian Oil Palm Research Center-Cenipalma, Bogota, Colombia
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Souza Dias E, Labory CRG, Herrera KMS, Alves AA, Torres GA, Rinker DL. Cytological studies of Agaricus brasiliensis. World J Microbiol Biotechnol 2008. [DOI: 10.1007/s11274-008-9769-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Vargas SM, Torres GA, Sobrinho FS, Pereira AV, Davide LC. Karyotypic studies of Cratylia argentea (Desv.) O. Kuntze and C. mollis Mart. ex Benth. (Fabaceae - Papilionoideae). Genet Mol Res 2007; 6:707-712. [PMID: 18050091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Cratylia argentea and C. mollis (Fabaceae-Papilionoideae) are legume shrubs native to the Cerrado and Caatinga, respectively. Both species show great resistance to drought and high nutritive value, which makes them a valuable forage resource in tropical regions. Cytogenetic studies were carried out on accessions of C. argentea and C. mollis from Germplasm Banks of Embrapa Gado de Leite (Juiz de Fora, MG) and Embrapa Semi-Arido (Petrolina, PE), respectively. Root tips were treated with 3 mM 8-hydroxyquinoline and slides were made using the air-dry technique. Karyotype description for each accession took into account the following features: chromosome number; total length, relative length and arm ratio of each chromosome; haploid set length, and degree of asymmetry. Mitotic metaphases in both species showed 2n = 22 chromosomes, where this is the first report of diploid number for C. mollis. Chromosome length was also quite similar for the two species, ranging from 5.08 to 2.50 microm in C. argentea and 5.12 to 2.51 microm in C. mollis, with haploid sets of equal size, measuring 38.10 and 37.85 microm, respectively. However, they did not show the same karyotypic formula, which was 5 m + 4 sm + 2 st for C. argentea and 7 m + 2 sm + 2 st for C. mollis. This indicates the occurrence of rearrangements within chromosomes I and VI. Both karyotypes showed a tendency for asymmetry.
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Affiliation(s)
- S M Vargas
- Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil
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