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• W1971292041 abstract "The chromosome number of 41 species belonging to 24 genera of Rubiaceae from South India has been studied. The chromosome numbers range from 2n=18 to 2n=72. First record of chromosome numbers have been made as many as 11 species and deviant records of chromosome number as against the previous reports have been worked out in 2 species. In the rest of the species studied, the present report of chromosome numbers confirms the previous records.A common survey of the chromosome numbers in Rubiaceae reveals the existence of graded series of haploid numbers from 6 to 110. Of those, haploid numbers n=11 and n=22 represented the highest frequency among the taxa studied. Therefore, it may be assumed that the original primary basic number may be 11 and it should have given rise to derived primary basic number 22. A process of chromosomal reduction as observed among the species of Crepis might have been in operation so that the basic number 11 might have got reduced to n=10, n=9 and finally to n=6 by a series of unequal translocations involving concurrent loss of inert heterochromatin parts of the chromosomes. The other higher haploid numbers above the level of n=11 should have been arisen by means of aneuploidy and euploidy.As revealed by karyotype analyses of 41 taxa of Rubiaceae studied it is clear that, there is a close correlation between the size and the number of somatic chromosomes. Karyotypes in Rubiaceae also show differences in absolute chromosome size indicating changes in nuclear DNA in evolution. No definite trend of either phylogenetic increase or decrease of chromosome size is indicated by the available limited data.In the present study, critical karyotype analyses of as many as 41 species of Rubiaceae showed asymmetrical karyotype. Along side this advanced character, and by the common occurrence of subterminal kinetochores showed that this family may be considered as one of the most highly evolved families of Angiosperms." @default.
• W1971292041 created "2016-06-24" @default.
• W1971292041 creator A5044972192 @default.
• W1971292041 date "1987-01-01" @default.
• W1971292041 modified "2023-10-10" @default.
• W1971292041 title "Karyomorphological studies in South Indian Rubiaceae." @default.
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• W1971292041 doi "https://doi.org/10.1508/cytologia.52.343" @default.
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