Karyology and cytotaxonomy of the genus Passiflora L. (Passifloraceae)

Melo, Natoniel Franklin de; Cervi, Armando Carlos; Guerra, Marcelo

doi:10.1007/s006060170074

Cited by 83 publications

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“…Beal (1972) reported the presence of 5 satellited chromosomes in this species, but the mean length of the chromosomes (3.4-4.5 µm) was very similar to ones found in this study (3.01-4.51 sµm). P. alata showed satellites on the 2 largest pairs of chromosomes while Melo et al (2001) observed satellites on the 2 smallest pairs agreeing with Mayeda (1997) although more than 8 satellited pairs have been identified in the prometaphase by Melo et al (2001). P. alata chromosome length is according to the values found by Mayeda (1997), except the 9 pair which showed a difference of 12% in relation to absolute length.…”

Section: Discussionsupporting

confidence: 80%

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Karyotype of Six Passiflora Species Collected in the State of Rio de Janeiro

et al. 2003

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Summary It was described karyotypes of 6 species (2nϭ18) collected in Rio de Janeiro, P. alata, P. edmundoi, P. malacophylla, P. mucronata, P. galbana, P. quadrangularis. To do that young root tips were either obtained from seedling or adult plants. The arm ratio for each chromosome (r), total haploid chromatin length (THC), and asymmetry index (TF%) were calculated. Some differences as THC, TF%, position of the centromere, and number, type and position of satellites were observed among the species studied. The species showed metacentric and submetacentric chromosomes, except P. galbana that showed only metacentric chromosomes. P. malacophylla revealed the smallest THC (14.67 µm) while P. quadrangularis revealed the largest (33.58 µm). The karyotypes varied in relation to other specimens studied and this result, allied to chromosome segregation studies, suggests the existence of intraspecific karyotypic variation in Passiflora species.

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Section: Discussionsupporting

confidence: 80%

“…P. alata chromosome length is according to the values found by Mayeda (1997), except the 9 pair which showed a difference of 12% in relation to absolute length. It was observed satellites in the chromosomes pairs 5 and 6 of P. mucronata while Melo et al (2001) observed satellites on the 2 smallest pairs.…”

Section: Discussionmentioning

confidence: 90%

Karyotype of Six Passiflora Species Collected in the State of Rio de Janeiro

et al. 2003

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“…In this region numerical chromosome variation has been observed as polyploidy in many related species, as genus Emilia of the Asteraceae (Guerra & Nogueira 1990) or in isolated geographic races of Passiflora misera H. B. & K. (Melo et al 2001). But none variation of chromosome number has been reported in Zephyranthes or any other monocotyledons species.…”

Section: Introductionmentioning

confidence: 98%

Intrapopulational chromosome number variation in Zephyranthes sylvatica Baker (Amaryllidaceae: Hippeastreae) from Northeast Brazil

Felix¹,

Dutilh²,

Melo³

et al. 2008

Rev. bras. Bot.

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-(Intrapopulational chromosome number variation in Zephyranthes sylvatica Baker (Amaryllidaceae: Hippeastreae) from Northeast Brazil). Zephyranthes Herb. is a taxonomically complex and cytologically variable group, with about 65 species of Neotropical distribution. Chromosome number variability in 32 individuals of a Zephyranthes sylvatica population from Northeast Brazil was investigated. Three cytotypes were found: 2n = 12 (one metacentric, four submetacentric and one acrocentric pairs), in 24 individuals; 2n = 12 + 1B, in five and three individuals with 2n = 18, a triploid cytotype. All diploid individuals showed chromosomes with polymorphism in pair one and two, while in triploids this polymorphism was observed in all chromosome triplets, generally with two homomorphic chromosomes and a higher or lower heteromorphic chromosome. All individuals had reticulated interfasic nucleus and a slightly asymmetric chromosome complement, with one metacentric chromosome pair and the others more submetacentric to acrocentric. These data confirm the cytological variability previously registered for the genus. Mechanisms involved in karyotypic evolution in this population are discussed.Key words -Amaryllidaceae, B chromosomes, chromosome variability, triploid, Zephyranthes RESUMO -(Variação cromossômica numérica intrapopulacional em Zephyranthes sylvatica Baker (Amaryllidaceae: Hippeastreae) no Nordeste do Brasil). O gênero Zephyranthes Herb. é um grupo taxonômicamente complexo e cariologicamente variável, compreende cerca de 65 espécies de distribuição predominantemente neotropical. O presente trabalho aborda a variabilidade cariológica em um total de 32 indivíduos de Z. sylvatica obtidas em uma única população do Nordeste do Brasil. Todos os indivíduos apresentaram núcleo interfásico reticulado e complemento cromossômico bimodal, pela ocorrência de um par cromossômico metacêntrico e os demais submetacêntricos. Foram observados três citotipos: 2n = 12 (um par metacêntrico, quatro submetacêntricos e um acrocêntricos) em 24 indivíduos; 2n = 12 + 1B, em cinco, além de um citotipo triplóide com 2n = 18 em três indivíduos. Todos os citotipos diplóides exibiram polimorfismo cromossômico para os pares um e dois, enquanto nos triplóides esse mesmo polimorfismo foi observado nas trincas correspondente aos pares cromossômicos diplóides, geralmente com dois cromossomos homórficos e um cromossomo heteromórfico maior que os dois anteriores. Esses dados confirmam a variabilidade cariológica anteriormente registrada para o gênero. São discutidos os mecanismos de evolução cariotípica envolvidos nessa variabilidade.

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“…Chromosome analysis of some fruit trees has progressed by application of the enzymatic maceration method and/or fluorescent staining (De Melo et al, 2001;Guerra, 1993;Kitajima et al, 2001;Schuster, 1996;Yamamoto et al, 1999;Zhuang et al, 1990). Clearly defined chromosome samples have been obtained by the enzymatic maceration method (Kurata and Omura, 1978).…”

Section: Introductionmentioning

confidence: 99%

Fluorescent Staining Analysis of Chromosomes in Pear (Pyrus spp.)

Yamamoto

Takada

Hirabayashi

et al. 2010

J. Japan. Soc. Hort. Sci.

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Fluorescent banding patterns of pear chromosomes were determined from samples taken from root tips of openpollinated seedlings of six cultivars from three species [Pyrus pyrifolia (Burm. F) Nakai (Japanese pear), P. communis L. (European pear), and P. bretschneideri Rehder (Chinese pear)]. Root tips were pretreated in 2 mM 8-hydroxyquinoline at 10°C for 4 h; the chromosome samples were prepared by the enzymatic maceration and air-drying method. All cultivars used in this study had 2n = 34 chromosomes. Chromomycin A 3 (CMA) positive (+) bands were observed in telomeric positions of four chromosomes. In some samples, these CMA + bands were observed at satellite positions. 4'-6-diamidino-2-phenylindole (DAPI) negative bands (−) were seen to correspond with CMA + bands. Thirty chromosomes had no CMA +/DAPI − bands. No propidium iodide (PI) bands were observed in any chromosomes. The number and positions of CMA + bands were stable, and there was no difference among the three species.

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Karyology and cytotaxonomy of the genus Passiflora L. (Passifloraceae)

Cited by 83 publications

References 0 publications

Karyotype of Six Passiflora Species Collected in the State of Rio de Janeiro

Karyotype of Six Passiflora Species Collected in the State of Rio de Janeiro

Intrapopulational chromosome number variation in Zephyranthes sylvatica Baker (Amaryllidaceae: Hippeastreae) from Northeast Brazil

Fluorescent Staining Analysis of Chromosomes in Pear (Pyrus spp.)

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