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Plant and Cell Physiology, 1986, Vol. 27, No. 2 355-361
© 1986

Article

Amplification of Extrachromosomal Circular DNA in Intact Bean Leaves Treated with Benzyladenine

Takahiro Kunisada1, Hideo Yamagishi1, Isao Kinoshita2 and Hideo Tsuji2

1Department of Biophysics, Faculty of Science, Kyoto University Kyoto 606, Japan
2Laboratory for Plant Ecological Studies, Faculty of Science, Kyoto University Kyoto 606, Japan

Bean (Phaseolus vulgaris L.) leaves were treated with benzyladenine (BA) beginning 7 days after sowing, and were harvested at 21 days. There were less than 10 molecules per cell of small polydisperse circular (spc) DNA in mesophyll cells from untreated leaves, and more than 30 molecules in the BA-treated cells. The spcDNA ranged in size from 0.2 to 7.5 µm, with a mean length of 1.7 µm.

(Received May 29, 1985; Accepted December 24, 1985)
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