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The influence of light quality on the phytochrome content of light grownSinapis albaL. andPhaseolus aureusRoxb.

✍ Scribed by C. A. H. Kilsby; C. B. Johnson

Publisher
Springer-Verlag
Year
1981
Tongue
English
Weight
550 KB
Volume
153
Category
Article
ISSN
0032-0935

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✦ Synopsis

The effect on the phytochrome system of light regimes establishing a range of photoequilibria was studied in two light grown dicotyledonous plants, both of which were treated with the herbicide SAN 9789 to prevent chlorophyll accumulation. In Sinapis alba L. cotyledons the results are comparable with phytochrome behaviour in etiolated mustard seedlings; the level of Pfr becomes independent of wavelength whereas the total phytochrome level is wavelength dependent. Contrasting properties are exhibited in Phaseolus aureus Roxb. leaves in which total phytochrome is unaffected by light quality; consequently the Pfr level is dependent on wavelength. Nevertheless, the amount of phytochrome in mung leaves increased after transfer to darkness suggesting that light still has a profound influence on the phytochrome system, even though light quality during the light period and prior to darkness does not.

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