Abstract
Present cytological investigations from the cold desert regions of Lahaul-Spiti and Kinnaur (India) record the first ever tetraploid (2n=32) chromosome count and cytomixis in Clematis orientalis L. var. acutifolia Hook. f. et Thoms. The phenomenon of cytomixis (9.33–29.80 %) involving chromatin transfer among 2–3 proximate pollen mother cells (PMCs) during male meiosis occurs through narrow and broad cytoplasmic channels from early prophase to tetrad stage. However, frequency of its occurrence during the later meiotic stages is rather low. Chromatin transfer results into the formation of hypo-, hyperploid and enucleated PMCs. Various meiotic abnormalities associated with cytomixis such as chromatin stickiness, pycnotic chromatin, interbivalent connections, out of plate bivalents, late disjunction of bivalents, and laggards and bridges resulted into some pollen sterility (16.33–49.30 %) and heterogeneous pollen grains size.
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Abbreviations
- MV:
-
morphovariant
- PMC:
-
pollen mother cell
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Acknowledgements
The authors are grateful to the University Grants Commission, New Delhi for providing financial assistance under the DRS SAP I and II and ASIST programme and CSIR for providing Senior Research Fellowship to senior author. Thanks are also due to the Head, Department of Botany for necessary laboratory and library facilities.
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Kumar, P., Singhal, V.K., Kaur, D. et al. Cytomixis and associated meiotic abnormalities affecting pollen fertility in Clematis orientalis . Biol Plant 54, 181–184 (2010). https://doi.org/10.1007/s10535-010-0031-1
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DOI: https://doi.org/10.1007/s10535-010-0031-1