In an investigation of intergeneric and interspecific relationships within the Asteraceae-Anthemideae, chromosome numbers were determined in 98 taxa (species, subspecies or varieties) from 27 genera, and chromosome morphology was also studied in many cases. The chromosome numbers of Mania tibetica, Anthemis chrysantha, A. melanoloma, Artemisia argentea, Handelia trichophylla, Lasiospermum bipinnatum, and Lepidolopha filifolia (all 2n=18) and of L. karatavica (2n=36-38) and Achillea depressa (2n=54) had not been reported previously. Wild tetraploid (2n=36) populations of Chamomilla recutita were found for the first time. Further cytological studies including a detailed analysis of meiosis were made in 12 species from the genera Anacyclus, Anthemis, Chrysanthemum and Piatricaria; aneuploidy was studied in Anthemis cotula, M. maritime and Matricaria perforate, the occurrence and meiotic behaviour of B chromosome was studied in Matricaria maritime, and a series of high polyploidm (from 5x to 8x) were studied in M. perforate. Nineteen different artificial intercytotype, interspecific and intergeneric F1 hybrid combinations within and between the genera Anthemis, Chamaemelum and Matricaria were obtained. Eleven of these had not been previously reported or studied. Meiotic chromosome behaviour was studied in these hybrids. Morphological studies of the hybrids and their parents were also made, including SEM studies of the achenes that revealed some new and distinctive micromorphological features in Anthemis.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:638605 |
| Date | January 1981 |
| Creators | Radwan, S. M. |
| Publisher | Swansea University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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