Abstract
Studies on the cytology and distribution pattern of 16 woody species of Verbenaceae from Palni hills have shown that: (i) in case ofLantana, the chromosome size is not influenced by increase or decrease in chromosome numbers, (ii) there is no correlation of chromosome size with the habits of different species ofVitex, (iii) transmigration of chromatin material inGmelina arborea, Lantana aculeata andSymphorema polyandrum results in encoutering of abnormal chromosome numbers, (iv) inLantana camara loose or compact association of various groups of chromosomes indicates that genomic constitution of the species is made up of intermingling of different genomes, (v)L.camara (4x) andL. indica (6x) do show the presence of multiple associations in some pollen mother cells which indicate their autoalloploid nature, and (vi) inNyctanthes arbortristis, the correct recorded number is 18 bivalents and the earlier reports of n=22 and n=24 cannot be explained easily.
The distribution pattern of various species in Palni hills as worked out here shows that in case of theLantana, tetraploid species have widers range of distribution as compared to 2x and 6x ones. The maximum representation of the presently studied species is between 900–1400 m altitudinal zone illustrating that each species is represented in more than one type of forests while overlapping of distribution in different forests is not a rare phenomenon of the investigated taxa.
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Chatha, G.S., Bir, S.S. Cytology and distribution pattern of woody species of Verbenaceae in Palni hills. Proc. Indian Acad. Sci. 98, 139–148 (1988). https://doi.org/10.1007/BF03053399
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DOI: https://doi.org/10.1007/BF03053399