The influence of blue- and red-biased light spectra on the growth and development of plants

Warrington, I J and Mitchell, K.J. (1976) The influence of blue- and red-biased light spectra on the growth and development of plants. Agricultural Meteorology, 16 (2). pp. 247-262.

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The various lighting systems used for studies of plant growth in controlled environment systems differed markedly in the proportions of blue and red waveband light emitted in the visible spectrum, depending both on the types of lamp chosen and on the proportions of each lamp type used. A series of new high-intensity lamp systems, which provided wide variations in blue:red waveband ratios were used to test, at different irradiance levels, the effects of these different light spectra on the growth of sorghum, soyabean, perennial ryegrass and white clover. The biased spectral treatments used resulted in marked differences in DM accumulation, affected the relative proportions of leaves and stems and influenced tiller and secondary stem development. Final shoot dry weight and plant height were increased approximately 2-fold and leaf area was increased 46% with sorghum under the red-biased compared with blue-biased conditions at the low irradiance level tested. Blue-biased conditions also enhanced the concentrations of amino acids (particularly aspartic and glutamic acids) and protein whereas, in contrast, red-biased sources increased the concentrations of soluble sugars and starch in the leaf tissue. The implications of these results to controlled-environment studies are discussed

Item Type: Article
Author Affiliation: Division of Plant Physiology, Department of Scientific and Industrial Research, Palmerston North, New Zealand
Subjects: Plant Production
Plant Physiology and Biochemistry > Plant Physiology
Plant Physiology and Biochemistry > Biochemistry
Divisions: Sorghum
Depositing User: Ms K Syamalamba
Date Deposited: 31 Aug 2012 03:35
Last Modified: 31 Aug 2012 03:38

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