Plant DELLAs Restrain Growth and Promote Survival of Adversity by Reducing the Levels of Reactive Oxygen Species
butterfly09 添加于 2010-8-23 00:26
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作 者
ACHARD P, RENOU J, BERTHOME R, HARBERD N, GENSCHIK P 摘 要
Plant growth is adaptively modulated in response to environmental
change. The phytohormone gibberellin (GA) promotes
growth by stimulating destruction of the nuclear
growth-repressing DELLA proteins [1–7], thus providing
a mechanism for environmentally responsive growth regulation
[8, 9]. Furthermore, DELLAs promote survival of adverse
environments [8]. However, the relationship between these
survival and growth-regulatory mechanisms was previously
unknown. Here, we show that both mechanisms are dependent
upon control of the accumulation of reactive oxygen
species (ROS). ROS are small molecules generated during
development and in response to stress that play diverse
roles as eukaryotic intracellular second messengers [10].
We show that Arabidopsis DELLAs cause ROS levels to
remain low after either biotic or abiotic stress, thus delaying
cell death and promoting tolerance. In essence, stressinduced
DELLA accumulation elevates the expression of
genes encoding ROS-detoxification enzymes, thus reducing
ROS levels. In accord with recent demonstrations that ROS
control root cell expansion [11, 12], we also show that
DELLAs regulate root-hair growth via a ROS-dependent
mechanism. We therefore propose that environmental variability
regulates DELLA activity [8] and that DELLAs in turn
couple the downstream regulation of plant growth and
stress tolerance through modulation of ROS levels.-
详细资料
- 文献种类:期刊
- 期刊名称: Current Biology
- 期刊缩写: Current Biology
- 期卷页: 2008年 第18卷 第9期 656-660页
- ISBN: 0960-9822
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