Eight species of Ophryssect. Pseudophrys(Orchidaceae) were cytogenetically studied. The analysed species possess the most symmetrical karyotypes of the genus (M CA ranged from 10.21 to 15.87 and CV CL from 19.61 to 23.93) with 2n = 2x = 36, being composed of mainly metacentric chromosomes. The karyotype formulae were: 36m for Ophrys archimedea, 32m + 4sm for O. flammeola, 32m + 4sm for O. funerea, 36m for O. laurensis, 36m for O. lojaconoi, 34m + 2sm for O. lucifera, 34m + 2sm for O. obaesaand 36m for O. pallida. Karyotype morphometric characters were evaluated by calculating M CA and CV CL for the assessment of karyotype asymmetry, and CV CI for the evaluation of heterogeneity in the position of the centromeres. The relationships between species were thus finally elucidated. The species characterised by wide distribution show greater karyomorphological distance than those with restricted distribution. The possible evolutionary role of chromosomal rearrangements as well as gene mutations in the speciation of Ophrysis discussed
New cytological data in Ophryssect. PseudophrysGodfery and comparative karyomorphological studies in Ophrys L. (Orchidaceae)
PULVIRENTI, Santa Gloria;
2017-01-01
Abstract
Eight species of Ophryssect. Pseudophrys(Orchidaceae) were cytogenetically studied. The analysed species possess the most symmetrical karyotypes of the genus (M CA ranged from 10.21 to 15.87 and CV CL from 19.61 to 23.93) with 2n = 2x = 36, being composed of mainly metacentric chromosomes. The karyotype formulae were: 36m for Ophrys archimedea, 32m + 4sm for O. flammeola, 32m + 4sm for O. funerea, 36m for O. laurensis, 36m for O. lojaconoi, 34m + 2sm for O. lucifera, 34m + 2sm for O. obaesaand 36m for O. pallida. Karyotype morphometric characters were evaluated by calculating M CA and CV CL for the assessment of karyotype asymmetry, and CV CI for the evaluation of heterogeneity in the position of the centromeres. The relationships between species were thus finally elucidated. The species characterised by wide distribution show greater karyomorphological distance than those with restricted distribution. The possible evolutionary role of chromosomal rearrangements as well as gene mutations in the speciation of Ophrysis discussed| File | Dimensione | Formato | |
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