Phytochrome Control of Turion Formation in Spirodela polyrhiza L. Schleiden |
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Authors: | APPENROTH K-J; HERTEL W; AUGSTEN H |
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Institution: | Department of Biology (Plant Physiology), Friedrich Schiller University of Jena von-Hase-Weg 3, Jena, DDR-6900, GDR |
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Abstract: | Turion yield in Spirodela polyrhiza, strain SJ, is increasedby increasing the daily light period. This effect is more pronouncedin autotrophic than in mixotrophic conditions. Night-break irradiation(15 mins) increased turion yield by 150 % under the conditionsof an 8-h daily light period. Besides the effect of night-breakirradiation, end-of-day far-red irradiation decreased turionyield with increasing photoperiod, whereas end-of-day red irradiationwas without any effect. This demonstrates the promoting effectof the Pfr form of phytochrome on formation of light-grown turions. Formation of dark-grown turions was increased by about 240%by a single red light pulse and was reversed by an immediatelyapplied far-red light pulse. Consequently, under heterotrophicconditions phytochrome modulates the turion formation process. Spirodela polyrhiza L. Schleiden, duckweed, Lemnaceae, photomorphogenesis, phytochrome, turion |
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