נגישות
menu      
Advanced Search
Syntax
Search...
Volcani treasures
About
Terms of use
Manage
Community:
אסיף מאגר המחקר החקלאי
Powered by ClearMash Solutions Ltd -
PHOTOCONTROL OF HYPOCOTYL ELONGATION IN LIGHT‐GROWN Cucumis sativus L. PHOTOSYNTHETIC REQUIREMENT FOR A FLUENCE RATE DEPENDENT PHYTOCHROME RESPONSE
Year:
1991
Source of publication :
Photochemistry and Photobiology
Authors :
Gaba, Victor
;
.
Volume :
53
Co-Authors:
GABA, V., Division of Biosphere Sciences, Kings College, London, United Kingdom, Department of Virology, Institute of Plant Protection, Volcani Institute, ARO, P. O. B. 6, Bet Dagan, 50-250, Israel, University of London, Kensington Campus, Campden Hill Rd, London, W8 7AH, United Kingdom
BLACK, M., Division of Biosphere Sciences, Kings College, London, United Kingdom, University of London, Kensington Campus, Campden Hill Rd, London, W8 7AH, United Kingdom
CANAANI, O., Department of Biochemistry, Weizmann Institute of Science, Rehovot, 76100, Israel
ATTRIDGE, T.H., Department of Biosciences, Polytechnic of East London, Romford Rd., Stratford, London, E15 4LZ, United Kingdom
Facilitators :
From page:
399
To page:
405
(
Total pages:
7
)
Abstract:
We investigated the role of photosynthesis in the photocontrol of extension growth of the hypocotyl of light‐grown Cucumis sativus L. Previous work [Gaba and Black (1985b) Plant Physiol.79, 1011] demonstrated that the inhibition of cucumber hypocotyl elongation is a fluence rate dependent response in red light. However, the relative contributions of phytochrome and photosynthesis to the photon flux dependent inhibition response were not clear. Here we have shown that photoperception by the foliar cotyledons as well as the hypocotyl itself are responsible for fluence rate dependence in red light. The inhibitor of photosynthesis diuron [3‐(3,4‐dichlorophenyl)‐1, 1‐dimethylurea] reduced both the magnitude of inhibition and the fluence rate dependency in red light, indicating an involvement of photosynthesis. Furthermore, the growth of non‐pigmented seedlings (treated with the herbicide norflurazon) was less inhibited by red light, with no fluence rate dependency. In particular, inhibition due to cotyledon photoperception was completely lost in non‐pigmented (norflurazon‐treated) plants, and much reduced by diuron treatment. Hypocotyl‐perceived red light inhibition was only slightly reduced by treatment with norflurazon and diuron. Photosynthesis was compared directly to photo‐inhibition of growth: the photon flux response curve of oxygen evolution of green Cucumis cotyledons was distinctly different from that of hypocotyl inhibition. In conclusion, photosynthesis is an essential requirement for the cotyledon‐perceived inhibition, but the response itself is not due to photosynthesis. Copyright © 1991, Wiley Blackwell. All rights reserved
Note:
Related Files :
Show More
Related Content
More details
DOI :
10.1111/j.1751-1097.1991.tb03647.x
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
19302
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:27
You may also be interested in
Scientific Publication
PHOTOCONTROL OF HYPOCOTYL ELONGATION IN LIGHT‐GROWN Cucumis sativus L. PHOTOSYNTHETIC REQUIREMENT FOR A FLUENCE RATE DEPENDENT PHYTOCHROME RESPONSE
53
GABA, V., Division of Biosphere Sciences, Kings College, London, United Kingdom, Department of Virology, Institute of Plant Protection, Volcani Institute, ARO, P. O. B. 6, Bet Dagan, 50-250, Israel, University of London, Kensington Campus, Campden Hill Rd, London, W8 7AH, United Kingdom
BLACK, M., Division of Biosphere Sciences, Kings College, London, United Kingdom, University of London, Kensington Campus, Campden Hill Rd, London, W8 7AH, United Kingdom
CANAANI, O., Department of Biochemistry, Weizmann Institute of Science, Rehovot, 76100, Israel
ATTRIDGE, T.H., Department of Biosciences, Polytechnic of East London, Romford Rd., Stratford, London, E15 4LZ, United Kingdom
PHOTOCONTROL OF HYPOCOTYL ELONGATION IN LIGHT‐GROWN Cucumis sativus L. PHOTOSYNTHETIC REQUIREMENT FOR A FLUENCE RATE DEPENDENT PHYTOCHROME RESPONSE
We investigated the role of photosynthesis in the photocontrol of extension growth of the hypocotyl of light‐grown Cucumis sativus L. Previous work [Gaba and Black (1985b) Plant Physiol.79, 1011] demonstrated that the inhibition of cucumber hypocotyl elongation is a fluence rate dependent response in red light. However, the relative contributions of phytochrome and photosynthesis to the photon flux dependent inhibition response were not clear. Here we have shown that photoperception by the foliar cotyledons as well as the hypocotyl itself are responsible for fluence rate dependence in red light. The inhibitor of photosynthesis diuron [3‐(3,4‐dichlorophenyl)‐1, 1‐dimethylurea] reduced both the magnitude of inhibition and the fluence rate dependency in red light, indicating an involvement of photosynthesis. Furthermore, the growth of non‐pigmented seedlings (treated with the herbicide norflurazon) was less inhibited by red light, with no fluence rate dependency. In particular, inhibition due to cotyledon photoperception was completely lost in non‐pigmented (norflurazon‐treated) plants, and much reduced by diuron treatment. Hypocotyl‐perceived red light inhibition was only slightly reduced by treatment with norflurazon and diuron. Photosynthesis was compared directly to photo‐inhibition of growth: the photon flux response curve of oxygen evolution of green Cucumis cotyledons was distinctly different from that of hypocotyl inhibition. In conclusion, photosynthesis is an essential requirement for the cotyledon‐perceived inhibition, but the response itself is not due to photosynthesis. Copyright © 1991, Wiley Blackwell. All rights reserved
Scientific Publication
You may also be interested in