Pollen studies in the genus Echinops L. and Xeranthemum group (Asteraceae).
2007
Garnatje, Teresa | Martín, Joan
27 p., il
显示更多 [+] 显示较少 [-][EN] The genus Eckinops and the Xerantkemum complex have been related in our first molecular study of the tribe Cardueae. A survey of pollen morphology and ultrastmcture with electron microscopy was carried out in the present paper in al1 the genera belonging of these groups, ailowing to identify four pollen types. The exine pattern indicates that there are two pollen types in the genus Echinops (including Acantkolepis), although no differences have been found between sections in Eckinops. On the one hand, the annual species of Echinops and Acantkolepis orientalis show a pollen type that differs from that of perennial species of the former genus and on the other hand, the genera Ckardinia and Xerantkemum exhibit a distínct type of pollen to that of Amphoricarpos and Siebera. The interna1 structure of pollen is the same for al1 the genera. Only slight differences were observed in the tectum, but in al1 cases these concerned the anthemoid type. Statistically significant correlations between pollen size and the life cycle were found.
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