| Autor: |
Haidar, M. A., Orr, G. L., Westra, P. |
| Předmět: |
|
| Zdroj: |
Weed Research; Aug1997, Vol. 37 Issue 4, p219-228, 10p, 2 Charts, 5 Graphs |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Plný text