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Abstract

To understand the regulatory mechanisms
involved in tissue development by light, the kinetics of regulation
of Casparian strip (CS) development in garden pea
stems was studied. We found that short-term irradiation
with white light delayed the development of the CS and
used this delay to assess the quantitative eVect of light on
CS development. We examined the eVect of the duration
and Xuence rates of white light treatment on CS development
and observed a signiWcant relationship between
Xuence and the delay in CS development indicating that the
Bunsen–Roscoe law of reciprocity holds for this response.
The eVect of white light irradiation was not inhibited in the
presence of a photosynthetic inhibitor, DCMU, or a carotenoid
biosynthesis inhibitor, NorXurazon, indicating that
the delay in CS development by light is a photomorphogenetic
response rather than a subsidiary eVect mediated by
photosynthetic activity. An action spectrum for the
response displayed a major peak in the blue-light region,
suggesting a dominant role for blue-light receptors. A minor
peak in the red-light region also suggested the possible
involvement of phytochromes. Although phytochromes are
known to contribute to blue-light responses, phytochromedeWcient
mutants showed a normal delay of CS development
in response to blue light, indicating that the response
is not mediated by phytochrome and suggesting a role for
one or more speciWc blue-light receptors.

Item Type:	Article
Authors/Creators:	Karahara, I and Takaya, E and Fujibayashi, S and Inoue, H and Weller, JL and Reid, JB and Sugai, M
Journal or Publication Title:	Planta
ISSN:	0032-0935
DOI / ID Number:	10.1007/s00425-011-1451-7
Additional Information:	Copyright 2011 Springer-Verlag
Item Statistics:	View statistics for this item

Available Versions of this Item

• Development of the Casparian strip is delayed by blue light in pea stems. (deposited 06 Feb 2012 16:26)
  • Development of the Casparian strip is delayed by blue light in pea stems. (deposited 01 Aug 2012 17:09) [Currently Displayed]

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