Cytogenetics, geographical distribution, pollen stainability and fecundity of five diploid taxa of Santolina rosmarinifolia L. aggregate (Asteraceae: Anthemideae)

Original Article

DOI: 10.1007/s00606-009-0180-x

Cite this article as:
Rivero-Guerra, A.O. Plant Syst Evol (2009) 281: 17. doi:10.1007/s00606-009-0180-x

Abstract

The chromosome analysis of Santolina rosmarinifolia subsp. rosmarinifolia, S. oblongifolia, S. semidentata subsp. semidentata, S. semidentata subsp. melidensis, S. canescens and the hybrid complex (S. rosmarinifolia subsp. rosmarinifolia, S. oblongifolia and their putative hybrids) shows that all the taxa are diploids (2n = 2x = 18; 18 + 1 or more B chromosomes, with 2n = 19, 20 only in the hybrid complex). The results show a conserved general structure of the karyotype (14m + 2sm + 2st), but in S. semidentata subsp. melidensis it is variable, with 14m + 2sm + 2st in ten individuals, 14m + (1m − 1sm) + (1 m − 1st) in nine individuals and 12m + (1m − 1sm) + (1m − 1st) + 2st + 1B in five individuals. Tetraploid individuals occurred in the diploid populations of S. rosmarinifolia subsp. rosmarinifolia and S. canescens, and their autopolyploid origin is discussed. Multivalent configurations at diakinesis, simple and double chromosome bridges and delayed disjunction of homologous and non-homologous chromosomes at anaphase I have negative effects on pollen stainability. The mean fructification percentage is moderate. The results suggest that the complex is a mosaic of introgressive hybrids.

Keywords

Diploid Hybridisation Nested MANOVA Multiple regression Pollen stainability Fecundity Santolina 

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Departamento de Biología Vegetal y Ecología, Facultad de BiologíaUniversidad de SevillaSevilleSpain

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