Chromosomal Drift, a New Phenomenon in Plants

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Science  29 May 1970:
Vol. 168, Issue 3935, pp. 1115-1116
DOI: 10.1126/science.168.3935.1115


A seasonal shift in chromosome number of reproductive cells of Claytonia virginica, which coincided with near-drought conditions, resulted in a chromosome complement new to the population. The number reappeared 2 years later, the minimum time required for plants of that generation to produce flowers. Moreover, the chromosome number of root cells commonly differed from aerial organs of the same plant.