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Brassinosteroid transport


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Symons, GM, Ross, JJ, Jager, CE and Reid, JB 2008 , 'Brassinosteroid transport' , Journal of Experimental Botany, vol. 59, no. 1 , pp. 17-24 , doi: 10.1093/jxb/erm098.

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Brassinosteroids (BRs) are steroidal plant hormones
that are important regulators of plant growth. These
compounds are widely distributed throughout reproductive
and vegetative plant tissues. This raises the
question of whether or not BRs are transported over
long distances between these tissues. Several lines of
evidence indicate that this is not the case. Exogenous
BRs move only slowly, if at all, after application to
leaves; grafting BR-deficient mutants to wild-type
plants has no phenotypic effect; removal of the apical
bud or mature leaves does not reduce BR levels in the
remaining internodes; and, in tomato, wild-type sectors
do not substantially alter the growth of BR-deficient
sectors when the two types are together in a variegated
leaf. Although BRs do not undergo long-distance transport
they may influence long-distance signalling by
altering auxin transport. At the cellular level, BRs do
appear to be transported. The enzymes for BR biosynthesis
appear to be located within the cell, and to be
associated with the endoplasmic reticulum, in particular.
BR reception, on the other hand, is thought to occur
on the exterior cell surface. Therefore, BRs must move
from the interior of the cell to the exterior, where they
are perceived by the same cell or by neighbouring cells.
The existence of a feedback system, whereby bioactive
BRs negatively regulate their own biosynthesis, provides
further evidence that individual cells are able to
both perceive and synthesize BRs.

Item Type: Article
Authors/Creators:Symons, GM and Ross, JJ and Jager, CE and Reid, JB
Keywords: Brassinosteroids, perception, plant hormones, synthesis, transport.
Journal or Publication Title: Journal of Experimental Botany
ISSN: 0022-0957
DOI / ID Number: 10.1093/jxb/erm098
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