Induced Tetraploidy in Vinca rosea Linn
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TLDR
The coefficient of correlation between the abnormalities at different stages of meiosis and pollen sterility has been determined and there is no significant correlation between these irregularities and pollen Sterility.Abstract:
Tetraploidy was induced in Vinca rosea Linn. by treating seeds with. 0.4%/ of aqueous colchinine. By selfing the C1 plants, C2 progeny was raised. The tetraploid is characterised by possessing a stout stem and branches, broader and shorter leaves, larger stomata, slower rate of growth, larger pollen grains and high pollen sterility. The total alkaloid content is more in both generations of the tetraploid plants. Mitosis in the tetraploid is almost normal. Meiosis in both Cl and Cz plants is irregular. It is analysed statistically. The presence of univalents, micronuclei of different shape, spindle abnormalities followed by aggregation of chromosomes into groups at metaphase, and anaphase, irregular anaphase and formation of polyads have been frequently observed in the PMC's.The coefficient of correlation between the abnormalities at different stages of meiosis and pollen sterility has been determined. There is no significant correlation between these irregularities and pollen sterility.read more
Citations
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References
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Journal ArticleDOI
Pollen Morphology and Plant Taxonomy
TL;DR: In this article, Pollen Morphology and Plant Taxonomy is discussed. But the focus is on plant taxonomy, and not on pollen morphology and taxonomy of plants.
Journal ArticleDOI
Studies of Chromosomal Association and Behavior and Occurrence of Aneuploidy in Autotetraploid Grass Species, Orchard Grass, Tall Oat Grass, and Crested Wheatgrass
W. M. Myers,Helen D. Hill +1 more
TL;DR: In all three species the chromosomes were associated in pairs at mid-prophase of the first division, but frequent exchanges of partners indicated some quadrivalent formation, and the number and position of the micronuclei in the quartets confirm the assumption that most, if not all, of them originated from lagging and dividing univalents at anaphase I.
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