Abstract
Using the histophotometric method for estimation of DNA in elongating plant cells, changes of the DNA content are found of approximately 20 %. The simplest explanation would be that the variations of the amount of Feulgenstain represent true changes of the DNA content.It is suggested that, when a young plant cell is coming in the zone of cell elongation the amount of DNA is decreased by 20 %. After exactly two doublings of the amount of DNA there is a new increase of the DNA content by 20 % during the real cell elongation phase.
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