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Benzyladenine-Induced Increase in DNA Content per Chloroplast in Intact Bean Leaves

Laboratory for Plant Ecological Studies, Faculty of Science, Kyoto University, Kyoto 606, Japan

Benzyladenine (BA) treatment was found to induce chloroplast DNA (ctDNA) synthesis after it had stopped in primary leaves of light-grown intact bean plants (Phaseolus vulgaris L.). The leaves were treated with BA from 7 days after sowing. Chloroplasts were isolated and the ctDNA content per chloroplast was determined. Chloroplast division occurred until 13 days after sowing in untreated leaves. BA stimulated the division keeping the level of ctDNA content per chloroplast the same as that in the untreated controls. After the division period, the ctDNA content per chloroplast increased in BA-treated leaves, but not in controls. Consequently, ctDNA per leaf (or per cell) increased immediately after the beginning of BA treatment, but remained constant in the control leaves.

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