SMALLSEED DODDER (CUSCUTA PLANIFLORA) GRAVITROPISM IN RED LIGHT AND IN REDPLUS FAR-RED
1996
White light-grown seedlings of smallseed dodder were cyclically irradiated from above with red light for 4 h followed by red plus far-red for 4 h. Tracings of initially nearly vertical, white light-grown seedlings were made from time-lapsed video images after four cycles of red light followed by red plus far-red. Stems of seedlings cycled into red light were negatively gravitropic and stems of seedlings then cycled into red plus far-red became photoreversibly, positively gravitropic. Observations suggest gravitropic sign reversal in smallseed dodder is regulated by phytochrome. Nomenclature: Smallseed dodder, Cuscuta planiflora Tenore #3 CVCPL. Additional index words. CVCPL, phytochrome.
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