Abstract
Data available for the nucleolus organizing region in the familyApiaceae are reviewed. An attempt has been made to establish the exact number of this region in various subfamilies and tribes through studies on the karyotype and nucleolus. Most of the taxa have a single nucleolar chromosome per haploid complement. The location of the nucleolar organizing region (NOR) on the chromosome varies. Members ofHydrocotyloideae differ drastically from those of subfam.Saniculoideae andApioideae, with respect to the location of NOR. Despite wide geographical distribution, varied ecological preferences and differences in morphology, anatomy and cytology, Umbellifers have attained stability in the number and location of NORs. Characters of NOR offer scope for utilization in understanding phylogenetic relationships at higher levels of taxonomic hierarchy.
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Studies on the Nucleolus and Nucleolar Chromosomes in Angiosperms XII.
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Hamal, I.A., Langer, A. & Koul, A.K. Nucleolar organizing region in theApiaceae (Umbelliferae). Pl Syst Evol 154, 11–30 (1986). https://doi.org/10.1007/BF00984865
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DOI: https://doi.org/10.1007/BF00984865