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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, vol. 22, no. 1 , pp. 3-14 , doi: 10.1007/s00344-003-0017-8.

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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

Item Type: Article
Authors/Creators:Symons, GM and Reid, JB
Journal or Publication Title: Journal of Plant Growth Regulation
ISSN: 0721-7595
DOI / ID Number: 10.1007/s00344-003-0017-8
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