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      Characterization of new variety of Chrysanthemum by using ISSR markers Translated title: Caracterização de novas cultivares de crisântemo com o uso de marcadores ISSR

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          Abstract

          Chrysanthemum is the important cut flower after rose among the ornamental plants traded in the global flower market. It is propagated vegetatively and also has a strong sporophytic self-incompatibility system as shown by all members of Asteraceae family. Morphologically, the petal numbers and flower colours present maximum variation when compared to existing varieties. Twenty Inter Simple Sequence Repeat primers were used to detect the new variety of Chrysanthemum developed through spontaneous sporting. The results indicate that the rate of polymorphism showed significant differences as compared to other existing varieties. The average number of amplification products per primer was eight. The size of ISSR amplified fragments varied from 0.25 - 2.4 Kbp. Therefore, ISSR marker is a useful technique for the rapid and easy assessment of genetic variation among the variants. Morphological traits of new variants showed variation as compared to other parents. The 1st flower bud appearance and the height of 1st bud of the variant were less as compared to original mother variety. The new variants can be propagated in large scale commercially through in vitro technique.

          Translated abstract

          Entre as plantas ornamentais comercializados no mercado mundial, o crisântemo é a flor de corte de maior importância sendo superado apenas pela rosa. Ele é propagado vegetativamente e também tem um forte sistema de auto-incompatibilidade esporofítica como mostrado por todos os membros da família Asteraceae. Morfologicamente, os números de pétalas e as cores das flores apresentam variação máxima em relação às cultivares existentes. Empregou-se vinte primers ISSR (Inter Simple Sequence Repeat) para caracterizar a nova cultivar de crisântemo desenvolvida por mutação expontânea. Os resultados indicam que a taxa de polimorfismo mostrou diferenças significativas em comparação com outras cultivares existentes. Foi de oito o número médio de produtos de amplificação por primers. O tamanho dos fragmentos ISSR amplificados variou de 0,25 a 2,4 Kbp. Portanto, o marcador ISSR é uma técnica útil para a avaliação rápida e fácil de variações genéticas entre cultivares. Características morfológicas de novas cultivares apresentaram variação em comparação com outros parentais. O aparecimento do primeiro botão floral e a sua altura na nova cultivar foi mais tardio e mais baixo quando comparado com o progenitor feminino. As novas cultivares podem ser propagadas em larga escala comercialmente através da técnica in vitro.

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          Genome fingerprinting by simple sequence repeat (SSR)-anchored polymerase chain reaction amplification.

          Simple sequence repeats (SSR), or microsatellites, are ubiquitous in eukaryotic genomes. Here we demonstrate the utility of microsatellite-directed DNA fingerprinting by polymerase chain reaction (PCR) amplification of the interrepeat region. No sequencing is required to design the oligonucleotide primers. We tested primers anchored at 3' or 5' termini of the (CA)n repeats, extended into the flanking sequence by 2 to 4 nucleotide residues [3'-anchored primers: (CA)8RG, (CA)8RY, and (CA)7RTCY; and 5'-anchored primers: BDB(CA)7C, DBDA(CA)7, VHVG(TG)7 and HVH(TG)7T]. Radioactively labeled amplification products were analyzed by electrophoresis, revealing information on multiple genomic loci in a single gel lane. Complex, species-specific patterns were obtained from a variety of eukaryotic taxa. Intraspecies polymorphisms were also observed and shown to segregate as Mendelian markers. Inter-SSR PCR provides a novel fingerprinting approach applicable for taxonomic and phylogenetic comparisons and as a mapping tool in a wide range of organisms. This application of (CA)n repeats may be extended to different microsatellites and other common dispersed elements.
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            Isolation of plant DNA from fresh tissues

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              Rapid detection of genetic variability in chrysanthemum (Dendranthema grandiflora Tzvelev) using random primers.

              Genetic variation in chrysanthemum (Dendranthema grandiflora) was studied using a recently developed technique generating Random Amplified Polymorphic DNAs (RAPDs). It appeared that variation between cultivars was high and that the cultivars used could be distinguished from each other by using only two different primers. A family of cultivars, derived from one original cultivar by vegetative propagation, had identical fragment patterns. Because of the high level of polymorphism and clonal stability RAPD fragments are useful for cultivar identification. Genetic variability among related Dendranthema species was too high to study genetic distances either among cultivars within chrysanthemum or among species related to chrysanthemum.
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                Author and article information

                Journal
                hb
                Horticultura Brasileira
                Hortic. Bras.
                Associação Brasileira de Horticultura (Vitoria da Conquista, BA, Brazil )
                0102-0536
                1806-9991
                December 2011
                : 29
                : 4
                : 613-617
                Article
                S0102-05362011000400029 S0102-0536(11)02900429
                db505e98-de0c-4ba6-a962-6361a3df9042

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 22 October 2010
                : 30 November 2011
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 26, Pages: 5
                Product

                SciELO Brazil

                Categories
                Grower's Page

                Chrysanthemum,sporting,marcadores ISSR,identificação de variedades,mutação,ISSR markers,variety identification

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