Meiotic Studies in Some Species of Tribe Cichorieae (Asteraceae) from Western Himalayas
The present paper deals with meiotic studies in 15 species belonging to 6 genera of the tribe Cichorieae from various localities of Western Himalayas. The chromosome number has been reported for the first time in Hieracium crocatum (2n=10) and Lactuca lessertiana (2n=2x=16). Further, intraspecific v...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2014-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2014/673456 |
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| Summary: | The present paper deals with meiotic studies in 15 species belonging to 6 genera of the tribe Cichorieae from various localities of Western Himalayas. The chromosome number has been reported for the first time in Hieracium crocatum (2n=10) and Lactuca lessertiana (2n=2x=16). Further, intraspecific variability has been reported for the first time in H. umbellatum (2n=2x=10 and 2n=6x=54), Tragopogon dubius (2n=2x=14 and 2n=4x=28), and T. gracilis (2n=2x=14). The chromosome report of 2n=2x=10 in Youngia tenuifolia is made for the first time in India. Maximum numbers of the populations show laggards, chromosome stickiness, and cytomixis from early prophase to telophase-II, leading to the formation of aneuploid cells or meiocytes with double chromosome number. Such meiotic abnormalities produce unreduced pollen grains and the reduced pollen viability. |
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| ISSN: | 2356-6140 1537-744X |