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Effects of Red and Far-Red Radiation on Cell Division and Elongation in the Stem of Pinto Bean Seedlings

Shigeru Nakata and James A. Lockhart
American Journal of Botany
Vol. 53, No. 1 (Jan., 1966), pp. 12-20
Stable URL: http://www.jstor.org/stable/2439919
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Red and Far-Red Radiation on Cell Division and Elongation in the Stem of Pinto Bean Seedlings
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Abstract

Nine-day-old Pinto bean seedlings, Phaseolus vulgaris L., were treated daily for 12 days with supplementary red or far-red radiation following daily exposure to 8 hr of daylight. Stem elongation was nearly exponential from the 4th to the 12th day of treatment and was about 2.9 times greater under far-red radiation. Cell division and cell elongation were promoted essentially equally by far-red radiation. There was virtually no difference in either the rate of leaf initiation or the duration of growth of internodes under the supplementary radiation.

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