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- Title
Effects of light and mechanical stimulation on coiling and prehaustoria formation in Cuscuta spp.
- Authors
Haidar, M. A.; Orr, G. L.; Westra, P.
- Abstract
Irradiation f 4-day-old dark-grown seedling of Cuscuta campestris Yuncker and Cuscuta indecora Choisy with 1 min of red light stimulated coiling and prehaustoria formation in excised upper 4-cm segments of seedling during a 48-h dark period in which zeatin was applied. Coiling and prehaustoria development were completely reversed when irradiated with 2 min of far-red light applied directly after red light. When detiolated segments were subjected to prolonged exposure of pure blue light, or mixtures of ultraviolet-A/far-red, blue/far-red or red/far-red light, coiling and prehaustoria development were induced. Blue light at photon fluxed lower than 1 μmol m-2 s-1 did not promote coiling and formation of prehaustoria. Mechanical stimulation caused tendrils to coil and form prehaustoria in blue and blue/far-red light, but not in darkness. Zeatin substituted for high irradiance blue light and mechanical stimulation caused coiling and prehaustoria formation.
- Subjects
SEED irradiation; CUSCUTACEAE; EFFECT of radiation on plants; TUBIFLORAE; IRRADIATION; RADIATION
- Publication
Weed Research, 1997, Vol 37, Issue 4, p219
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1046/j.1365-3180.1997.d01-36.x