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Smallseed Dodder (Cuscuta planiflora) Phototropism toward Far-red When in White Light

Published online by Cambridge University Press:  12 June 2017

Gregory L. Orr ,
Mustapha A. Haidar  and
Deborah A. Orr
Gregory L. Orr
Affiliation:
Dep. Plant Pathol. & Weed Sci., Colorado State Univ., Fort Collins, CO 80523
Mustapha A. Haidar
Affiliation:
Dep. Crop Prod. & Protect., American Univ., Beirut, Lebanon
Deborah A. Orr
Affiliation:
Tavelli Elementary, Poudre R-1 School District, Fort Collins, CO, 80524
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Abstract

White light-grown seedlings of smallseed dodder were (a) provided with unilateral far-red (700 to 800 nm) at photon irradiances ranging from 20 to 110 μmol m−2 s−1 against a background of cool white light (400 to 700 nm) from above at 77 μmol m−2 s−1, or (b) transferred to darkness and provided with unilateral white light at 20 μmol m−2 s−1, unilateral blue light (400 to 500 nm) at 10 μmol m−2 s−1, unilateral red light (600 to 700 nm) at 10 μmol m−2 s−1, unilateral far-red at 50 μmol m−2 s−1, or (c) in experiments utilizing bilateral irradiations, provided with unilateral far-red perpendicular to unilateral white light. Positive phototropic curvature was induced by unilateral white light and by unilateral blue light in otherwise darkness and by unilateral far-red in a background of cool white light. Seedling vines were also phototropic toward unilateral far-red when provided with unilateral white light perpendicular to unilateral far-red. Phototropism to unilateral white light was inhibited in seedlings treated with 200 μM norflurazon and 50 mM potassium iodide. Norflurazon- and potassium iodide-treated seedlings remained phototropic toward unilateral far-red when provided with unilateral white light perpendicular to unilateral far-red. Seedling vines were not phototropic to unilateral red or to unilateral far-red in otherwise darkness, and seedlings in cool white light were neither skototropic (i.e., tropic toward unilateral darkness) nor tropic to or from infra-red (radiation with wavelengths greater than 900 nm). Phototropism toward regions of lowered red:far-red may aid smallseed dodder in chlorophyllous host location and attachment.

Keywords

Norflurazon, 4-chloro-5-(methylamino)-2-(3-(trifluoromethyl)phenyl)-3-(2H)-pyridazinoncsmallseed dodder, Cuscuta planiflora Tenore ♯ CVCPLCVCPLforagingparasitic angiospermphytochrome
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 44 , Issue 2 , June 1996 , pp. 233 - 240
Copyright
Copyright © 1996 by the Weed Science Society of America 

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