The influence of spectral quality on the internodal response of intact bean plants to brassins [internode elongation, incandescent lamps, fluorescent lamps, controlled environment, shoot morphogenesis, Phaseolus vulgaris]
1981
Krizek, D.T. | Worley, J.F. (U.S. Dept. of Agriculture, Beltsville, Maryland. Plant Stress Lab.)
The response of pinto bean (Phaseolus vulgaris L.) plants to single application of brassins (10 mu-g) in the second-internode assay was determined under equal levels (90mu-E m('-2) s('-1)) of photosynthetically active radiation in a controlled environment provided by cool-white fluorescent (CWF) lamps, incandescent (INC) lamps, or a combination of the two sources. Treatment of the second internode with brassins produced a characteristic swelling of the treated internode irrespective of the spectral source used. However, the increase in radial growth of the upper portion of brassin-treated internodes from plants grown under INC lamps was more than 50% greater than those of plants grown under CWF lamps for 7 days. Spectral quality also had a marked effect on the rate and extent of internode elongation. Brassin-treated internodes of plants grown for 7 days under CWF lamps were more than twice as long as those of control plants, whereas those from INC or CWF + INC grown plants were significantly shorter than those of control plants. The effect of brassins was largely confined of the treated internode.
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