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Polyploidy is known to be common in plants; indeed most of the world's economically important crop plants are polyploids. Recent studies revealed extensive genomic changes in synthetic polyploids after genome doubling, although most of the information available is with regards to allopolyploids and little information have been generated in autopolyploids. In the present study, we used Phlox drummondii Hooker (2n = 2x = 14) as a model plant to observe genomic changes, if any, in synthetic autopolyploids. Colchitetraploids were produced and followed through different generations (C 0 , C 1 , C 2 and C 3 ). Male meiosis analysis showed differences between the frequency of both quadrivalents and bivalents from C 0 to C 2 generations. RAPD analysis revealed 2.8, 1.6, 2.1 and 3.2% polymorphism in C 0 , C 1 , C 2 and C 3 colchitetraploids respectively. The polymorphic fragments were further characterized after cloning. Dot blot assay was performed to confirm high copy/low copy nature of fragments showing variation. The analysis revealed changes in both repetitive and non-repetitive regions. Out of the six fragments only one fragment T01 was found to be of high copy, while four fragments were of the moderate copy and one fragment of the low copy nature.

physiology and molecular biology of plants/physiology and molecular biology of plants

Cytogenetic and molecular evidences revealing genomic changes after autopolyploidization: a case study of synthetic autotetraploid Phlox drummondii Hook