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Spontaneous polyploidization in cucumber

Axel O. Ramírez-Madera, Edgar P. Spalding, Yiqun Weng, Michael J. Havey, N D Miller
Theoretical and applied genetics 2017 v.130 no.7 pp. 1481-1490
abnormal development, chimerism, cucumbers, endopolyploidy, field experimentation, flow cytometry, fruits, greenhouse experimentation, greenhouses, inbred lines, leaves, seedlings, seeds, shape, volunteer plants
Cucumber occasionally produces polyploid plants, which are problematic for growers because these plants produce misshaped fruits with non-viable seeds. In this study, we undertook the first quantitative study to estimate the relative frequency of spontaneous polyploids in cucumber. Seeds of recombinant inbred lines were produced in different environments, plants were grown in the field and greenhouse, and flow cytometry was used to establish ploidies. From 1422 greenhouse-grown plants, the overall relative frequency of spontaneous polyploidy was 2.2%. Plants possessed nuclei of different ploidies in the same leaves (mosaic) and on different parts of the same plant (chimeric). Our results provide evidence of endoreduplication and polysomaty in cucumber, and that it is an on-going and dynamic process. There was a significant effect (p = 0.018) of seed production environment on the occurrence of polyploid plants. Seed and seedling traits were not accurate predictors of eventual polyploids, and we recommend that cucumber producers rogue plants based on stature and leaf serration to remove potential polyploids.