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Blue and red photoselective shadecloths modify pea height through altered blue irradiance perceived by the cry1 photoreceptor


Cummings, IG and Foo, E and Weller, JL and Reid, JB and Koutoulis, A, Blue and red photoselective shadecloths modify pea height through altered blue irradiance perceived by the cry1 photoreceptor, Journal of Horticultural Science and Biotechnology, 83, (5) pp. 663-667. ISSN 1462-0316 (2008) [Refereed Article]

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Copyright 2008 Journal of Horticultural Science & Biotechnology

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DOI: doi:10.1080/14620316.2008.11512440


The use of shadecloth is common in horticulture to reduce Summer heat load on crops; however, such shading can increase shoot elongation to undesirable levels. A possible solution is to use photoselective shadecloths to overcome the problem of shoot elongation. To examine this question, pea (Pisum sativum L.) plants were grown under no shade, 50% neutral shadecloth, or 50% blue, or 50% red photoselective shadecloths. Under the red and blue shadecloths, the blue fraction was altered, but there was little alteration in other wavelengths relative to neutral shadecloth or to sunlight. Relative to neutral shadecloth, shoot length was reduced significantly under blue shadecloth, and increased significantly under red shadecloth. The effect of the red and blue shadecloths appeared to be mediated by alterations in blue irradiance perceived by the blue light cry1 photoreceptor, as, unlike wild-type (WT) peas, cry1 mutant peas did not respond to the shadecloth treatments. Levels of GA1 were reduced under blue shadecloth in WT pea plants compared with neutral shadecloth, but not in cry1 mutant plants. This study demonstrates that photoselective shadecloths can be used to manipulate plant height and flowering in crops with a strong response to blue irradiance.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural crops
Objective Field:Horticultural crops not elsewhere classified
UTAS Author:Cummings, IG (Mr Ian Cummings)
UTAS Author:Foo, E (Associate Professor Eloise Foo)
UTAS Author:Weller, JL (Associate Professor Jim Weller)
UTAS Author:Reid, JB (Professor Jim Reid)
UTAS Author:Koutoulis, A (Professor Anthony Koutoulis)
ID Code:54663
Year Published:2008
Web of Science® Times Cited:6
Deposited By:Plant Science
Deposited On:2009-02-26
Last Modified:2014-05-28

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