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Interactions Between Light and Plant Hormones During De-etiolation


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Symons, GM and Reid, JB (2003) Interactions Between Light and Plant Hormones During De-etiolation. Journal of Plant Growth Regulation, 22 (1). pp. 3-14. ISSN 0721-7595

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The transition from a dark-grown (etiolated) to a light-grown (de-etiolated) morphology is marked by a number of dramatic phenotypic changes such as a significant reduction in the rate of shoot elongation, opening of the apical hook, expansion of true leaves and the development of mature chloroplasts. Many of these developmental processes are also known to be regulated by plant hormones. In this review we discuss the interactions between light and plant hormones and their role in mediating phenotypic change during de-etiolation. Clear evidence exists for a light-mediated reduction in gibberellin A, GA levels and response in pea, which is thought to be responsible, at least in part, for the reduction of shoot elongation during de-etiolation. Indirect evidence from a number of species has been used to suggest that the reduction in shoot elongation could also be mediated by a reduction in brassinosteroid (BR) levels. However, direct evidence recently obtained from pea and rice demonstrates that de-etiolation is not mediated, or even accompanied, by a reduction in BR levels. Ethylene is known to play an integral role in apical hook formation and maintenance in plants. However, the physiological significance of light-induced changes in IAA and ABA levels found in some species is not clear. Recent molecular data provide evidence of interactions between light-and IAA/CK-signalling pathways. Potential mechanisms for these interactions are discussed.

Item Type: Article
Journal or Publication Title: Journal of Plant Growth Regulation
Page Range: pp. 3-14
ISSN: 0721-7595
Identification Number - DOI: 10.1007/s00344-003-0017-8
Additional Information: The final publication is available at
Date Deposited: 10 Feb 2012 01:00
Last Modified: 18 Nov 2014 04:27
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