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Cytogenetics of Hypericum caprifoliatum Cham. & Schltdl. (Clusiaceae) populations and other species of the genus

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Author(s): Ana Paula Guisso Navarini | Maria Teresa Schifino-Wittmann | Ingrid Bergman Inchausti de Barros | Danielle Almeida

Journal: Crop Breeding and Applied Biotechnology
ISSN 1518-7853

Volume: 8;
Issue: 4;
Start page: 330;
Date: 2008;
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Keywords: Hypericum | chromosome number | meiotic behavior | pollen fertility | apomixis.

ABSTRACT
Chromosome numbers and meiotic behavior are presented for the first time for Hypericum caprifoliatum(2n=48), H. cf carinatum (2n=48) and H. polyanthemum (2n= 32) and confirmed the H. perforatum (2n=32) number.Chromosomes are very small (ca. 1 to 2 mm). Meiotic irregularities, such as uni and multivalents, un-oriented chromosomes,bridges and laggards were very frequent in H. caprifoliatum and H. cf carinatum. Meiotic indexes ranged from 44.0 to 73.0%in H. caprifoliatum, 66.0 to 77.0% in H. cf carinatum and was 80.0% for the H. polyanthemum population. Pollen fertilityranged from 42.0 to 88.0% in H. caprifoliatum, 65.0 to 88.0% in H. cf carinatum and was 89.0% for H. polyanthemum.Together with literature and meiotic behavior data, the great variability in pollen size and fertility within and among populationsof H. caprifoliatum and H. cf carinatum could suggest that, as many other Hypericum species, these taxa are apomictic.

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