Chromosome banding in three south Italian species of Allium section Allium (Alliaceae) |
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| Authors: | Saverio D'Emerico Domenico Pignone |
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| Institution: | (1) Istituto Botanico, Università di Bari, Via Orabona, 4 – 70125 Bari, Italy;(2) C.N.R., Istituto del Germoplasma, Via Amendola, 165/A – 70126 Bari, Italy |
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| Abstract: | The karyotypes of southern Italian samples of three species of the genus Allium L. belonging to the section Allium, were analyzed using Feulgen staining and C-banding techniques. Karyomorphological affinities and C-banding patterns clearly denote close phyletic relationships between A. commutatum Guss., A. ampeloprasum L. and A. atroviolaceum Boiss. Nevertheless, the karyotypes of the two tetraploid species revealed notable differences in the amount and distribution of C-banded heterochromatin. Marker chromosomes were identified which helped tracing evolutionary relationships among the three taxa considered. The results of morphological and karyological examinations allow the proposition of a possible phyletic pathway between the diploid species A. commutatum and the tetraploid ones A. ampeloprasum and A. atroviolaceum. The latter species seems to be particularly well adapted to southern Italian environments and might therefore contribute useful traits to closely related crops, such as leeks. |
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| Keywords: | Alliaceae Allium C-banding cytotaxonomy genetic resources karyomorphology |
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