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Smallseed Dodder (Cuscuta planiflora) Gravitropism in Red Light and in Red Plus Far-red

Published online by Cambridge University Press:  12 June 2017

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

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 photochrome.

Keywords

Smallseed dodder, Cuscuta planiflora Tenore ♯ CVCPLCVCPLphotochrome
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 44 , Issue 4 , December 1996 , pp. 795 - 796
Copyright
Copyright © 1996 by the Weed Science Society of America 

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