Journal
PLANT CELL REPORTS
Volume 26, Issue 11, Pages 1933-1939Publisher
SPRINGER
DOI: 10.1007/s00299-007-0415-7
Keywords
Arabidopsis thaliana; DNA fragmentation; in vitro; callogenesis; endoreduplication; polyploidization
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Leaf explants of diploid (2n = 2x = 10) and autotetraploid (2n = 4x = 20) plants of Arabidopsis thaliana ecotype Columbia were cytologically and cytogenetically analysed to determine the time and the mechanisms of the process of polyploidization. The first polyploid cells were observed after the third day of culture in both genotypes of explants. Polyploid cells were the result of pre-existing mixoploidy in explants of A. thaliana. Other factors such as endoreduplication, endomitosis, abnormal microtubules arrangement and DNA damage may have induced polyploidization during early stages of callogenesis.
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