Abstract
Under continuous white light (WL), extension growth of the first internode in Sinapis alba L. was promoted by low red (R): far-red (FR) ratios reaching the stem and-or the leaves. Conversely, the growth promotion by end-of-day light treatments was only triggered by FR perceived by the leaves and cotyledons, while FR given to the growning internode alone was tatally ineffective. Continuous WL+FR given to the internode was also in-effective if the rest of the shoot remained in darkness. Both the background stem growth, and the growth promotion caused by either an end-of-day FR pulse or continuous WL+FR given to the internode, increased with increasing fluence rates of WL given to the rest of the shoot. The increase by WL of the growth-stimulatory effect of low phytochrome photoequilibria in the internode appears to be mediated by a specific blue-light-absorbing photoreceptor, as blue-deficient light from sodium-discharge lamps, or from filtered fluorescent tubes, promoted background stem growth similarly to WL but did not amplify the response to the R:FR ratio in the internode. Supplementing the blue-deficient light (94 μmol·m-2·s-1) with low fluence rates of blue (<9 μmol·m-2·s-1) restored the promotive effect of low R:FR reaching the internode.
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Abbreviations
- BL:
-
blue light
- FR:
-
far-red light
- PAR:
-
photosynthetically active radiation
- Pfr/P:
-
ratio between the FR-absorbing form and total phytochrome
- R:
-
red light
- SOX:
-
low-pressure sodium lamp
- WL:
-
white light
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Supported by the Consejo Nacional de Investigaciones Cientificas y Técnicas (República Argentina) and the ORS scheme (UK)
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Casal, J.J., Smith, H. The loci of perception for phytochrome control of internode growth in light-grown mustard: Promotion by low phytochrome photoequilibria in the internode is enhanced by blue light perceived by the leaves. Planta 176, 277–282 (1988). https://doi.org/10.1007/BF00392456
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DOI: https://doi.org/10.1007/BF00392456