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UV-B radiation induces changes in polyamine metabolism in the red seaweed Porphyra cinnamomea
Citation
Schweikert, K and Sutherland, J and Hurd, CL and Burritt, D, UV-B radiation induces changes in polyamine metabolism in the red seaweed Porphyra cinnamomea, Plant Growth Regulation: An International Journal on Plant Growth and Development, 65, (2) pp. 389-399. ISSN 0167-6903 (2011) [Refereed Article]
Copyright Statement
Copyright 2011 Springer Science+Business Media
DOI: doi:10.1007/s10725-011-9614-x
Abstract
Early investigations on the productivity of
intertidal seaweeds found that, unlike some seaweeds,
members of the genus Porphyra, a Rhodophyte, could
tolerate physical stressors such as ultraviolet-B radiation
(UV-B) both during immersion and when exposed to air.
Increased stress tolerance was thought to be due to an
unknown mechanism that operated at the thylakoid level.
As recent research has shown that polyamines (PAs),
bound to the thylakoid membranes of chloroplasts, play a
critical role in protecting the photosynthetic apparatus from
high-light and UV damage in both higher plants and in
unicellular algae, we investigated PA metabolism in Porphyra
cinnamomea exposed to UV-B. Our results show that
PA biosynthesis was significantly upregulated in P. cinnamomea
in response to UV-B, with the greatest proportional
increases being in bound soluble putrescine (PUT),
which increased by over 200%, in bound soluble spermidine
(SPD) and spermine (SPM) which both increased
by more than 150% and in bound insoluble SPM which
increased by more than 120%. As PAs can be synthesised
from ornithine via ornithine decarboxylase (ODC) or from
arginine via arginine decarboxylase (ADC) we investigated
the pathway via which polyamines were synthesised in
P. cinnamomea. While exposure to UV-B caused increases
in the activities of both ADC and ODC, the increase in
ADC activity was 10 fold greater than that of ODC, suggesting
that the ADC pathway was the principle route by
which PA levels increased in response to UV-B. MechMechanisms
of PA mediated UV-B protection are discussed.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | Environmental stress physiology, seaweed, UV-radiation, polyamines |
| Research Division: | Biological Sciences |
| Research Group: | Plant Biology |
| Research Field: | Phycology (incl. Marine Grasses) |
| Objective Division: | Environment |
| Objective Group: | Climate and Climate Change |
| Objective Field: | Ecosystem Adaptation to Climate Change |
| Author: | Hurd, CL (Associate Professor Catriona Hurd) |
| ID Code: | 91472 |
| Year Published: | 2011 |
| Web of Science® Times Cited: | 9 |
| Deposited By: | IMAS Research and Education Centre |
| Deposited On: | 2014-05-20 |
| Last Modified: | 2014-06-23 |
| Downloads: | 0 |
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