Nuclear DNA and karyomorphological studies in vetiver (Vetiveria zizanioides L.) nash.

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Abstract
The details of chromosome morphology and nuclear DNA amount (2C value) in 20 different collections in V. zizanioides are presented. All the collections reveal the somatic chromosome number, 20. In general, the karyotypes are nearly symmetrical with chromosomes having median to submedian centromeres. However, variations are noticeable in various collections with respect to chromosome size and nuclear DNA content. The total haploid chromatin length varies from 25.6 .mu.m to 38.7 .mu.m and 2C value from 2.02 pg to 2.56 pg. The qualitative and quantitative variation in karyological features may possibly account for qualitative and quantitative variation in oil content/composition in the various collections. Further, the somatic chromosomes in one of the collections were also analyzed for Giemsa C-banding patterns to elucidate the finer details of chromosome organization for characterizing the individual chromosomes.

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