Abstract
Vanilla is naturally distributed in Mexico and parts of Central America and the history of origin of cultivated vanilla suggests that the entire stock outside Mexico may be from a single genetic source. In the present study, RAPD polymorphism was used to estimate the level of genetic diversity and interrelationships among different collections of Vanilla planifolia Andr., and few related species, including both leafy and leafless types such as V. tahitensis J.W.Moore, V. andamanica, Rolfe, V. pilifera Holtt., and V. aphylla Blume. Studies revealed that there are very limited variation within collections of V. planifolia, indicative of its narrow genetic base, and of the related species we tested, V. tahitensis is nearest to V. planifolia. The species studied are diverse and have a similarity ranging from 1.2 to 57.3 %. Of the sampled taxa, V. andamanica is the most divergent and there is also reasonable variability within its collections, indicating the possibility of natural seed set. A total of 82 polymorphic bands expressed in the RAPD profiles were used to generate a genetic distance matrix, which was then used in cluster analysis. Specific groupings were revealed by the cluster analysis whereby the leafless forms (V. aphylla, V. pilifera and the new species) and V. andamanica formed separate clusters. This is the first report of species interrelationship studies, including both cultivated and wild vanilla species.
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Acknowledgements
We are thankful to Dr Johnson K George, Sr. Scientist, Indian Institute of Spices Research and Dr KJ Madhusoodanan, Sr. Scientist, Indian Cardamom Research Institute, Spices Board, for sharing their collections of vanilla. We are also grateful to Dr PN Ravindran former Project Coordinator (Spices) for his help and guidance.
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Minoo, D., Jayakumar, V.N., Veena, S.S. et al. Genetic variations and interrelationships in Vanilla planifolia and few related species as expressed by RAPD polymorphism. Genet Resour Crop Evol 55, 459–470 (2008). https://doi.org/10.1007/s10722-007-9252-3
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DOI: https://doi.org/10.1007/s10722-007-9252-3