Chromosome numbers in some flowering plants of west pakistan
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Abstract
The present communication deals with male meiosis and karyotypic analysis in five species of the two genera, Alisma and Sagittaria. The course of meiosis was investigated with great difficulty because of stickiness of chromosomes. Alisma plantago-aquatica and A. gramineum posssess n=7 chromosomes with 5 chromosome pairs belonging to median-submedian category and 2 pairs to terminal category, while A. lanceolatum is at the tetraploid level with n=13. Both the species of Sagittaria sagittifolia and S. guayanensis possess a haploid number of n=11 chromosomes of which only 1 chromosome is of the median category whereas the other 10 belong to subterminal category. Karyotype evolution in the different taxa is discussed.
References (17)
Airy Shaw, H. K. 1973, A Dictionary of the Flowering Plants and Ferns. Cambridge Univ. Press.
Baquar, S. R. and Askari Abid, S. H. 1970. Chromosome numbers in some flowering plants of West Pakistan. Genet. Iber. 22: 1-11.
Björkgvist, I. 1967. Studies in Alisma L. I. Distribution, variation and germination. Opera Botanica 17: 1-128.
Björkgvist, I. 1968. Studies in Alisma L. II. Chromosome studies, crossing experiments and taxonomy. Opera Botanica. 19: 1-138.
Castro, D. De and Wagner, N. M. 1950. Preliminary observations on the cytology of the genus Alisma L. in Portugal. Genetica Iberica 2: 75-82.
The present communication deals with male meiosis and karyotypic analysis in five species of the two genera, Alisma and Sagittaria. The course of meiosis was investigated with great difficulty because of stickiness of chromosomes. Alisma plantago-aquatica and A. gramineum posssess n=7 chromosomes with 5 chromosome pairs belonging to median-submedian category and 2 pairs to terminal category, while A. lanceolatum is at the tetraploid level with n=13. Both the species of Sagittaria sagittifolia and S. guayanensis possess a haploid number of n=11 chromosomes of which only 1 chromosome is of the median category whereas the other 10 belong to subterminal category. Karyotype evolution in the different taxa is discussed.
References (17)
Airy Shaw, H. K. 1973, A Dictionary of the Flowering Plants and Ferns. Cambridge Univ. Press.
Baquar, S. R. and Askari Abid, S. H. 1970. Chromosome numbers in some flowering plants of West Pakistan. Genet. Iber. 22: 1-11.
Björkgvist, I. 1967. Studies in Alisma L. I. Distribution, variation and germination. Opera Botanica 17: 1-128.
Björkgvist, I. 1968. Studies in Alisma L. II. Chromosome studies, crossing experiments and taxonomy. Opera Botanica. 19: 1-138.
Castro, D. De and Wagner, N. M. 1950. Preliminary observations on the cytology of the genus Alisma L. in Portugal. Genetica Iberica 2: 75-82.
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