The role of sugars in integrating environmental signals during the regulation of leaf senescence.
The role of sugars in integrating environmental signals during the regulation of leaf senescence.
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DOI：
10.1093/jxb/eri279
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发表时间：
2006
影响因子：
6.9
通讯作者：
A. Wingler;S. Purdy;J. Maclean;Nathalie Pourtau
中科院分区：
文献类型：
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作者：
A. Wingler;S. Purdy;J. Maclean;Nathalie Pourtau
虽然叶片衰老导致光合碳固定的损失，但依赖于衰老的营养物质释放，特别是氮的释放，对于幼叶的生长和繁殖是重要的。因此，衰老的环境调节是植物碳和氮经济的重要因素。叶片衰老是一种高度可塑的性状，受到一系列不同环境因素的影响，包括光照、养分供应、CO2浓度以及非生物和生物胁迫。在这篇综述中，重点是在衰老过程中的糖积累和糖信号的环境条件的影响。通过在老叶中发出碳相对于氮的高可用性的信号，糖的积累可以触发叶片衰老。因此，糖诱导的衰老在低氮可用性下特别重要，并且也可能在光信号中起作用。糖是否参与调节植物对CO2浓度升高的衰老反应仍然没有解决。衰老可以延迟或加速在CO2浓度升高和糖积累和衰老之间没有明确的关系已经found.Plasticity在响应环境因素，如日照长度和糖积累，不同的拟南芥加入。这种自然变异可以用来分析衰老调节的遗传基础以及对生长和繁殖力的影响。不同的进化策略，即早衰老与高繁殖努力相结合或晚衰老与低繁殖努力相结合，可能是拟南芥种质对自然生境的重要适应。
Although leaf senescence results in a loss of photosynthetic carbon fixation, the senescence-dependent release of nutrients, especially of nitrogen, is important for the growth of young leaves and for reproduction. Environmental regulation of senescence is therefore a vital factor in the carbon and nitrogen economy of plants. Leaf senescence is a highly plastic trait that is affected by a range of different environmental factors including light, nutrient supply, CO2 concentration, and abiotic and biotic stress. In this review, the focus is on the impact of environmental conditions on sugar accumulation and sugar signalling during senescence. By signalling a high availability of carbon relative to nitrogen in the old leaves, sugar accumulation can trigger leaf senescence. Sugar-induced senescence is therefore particularly important under low nitrogen availability and may also play a role in light signalling. Whether or not sugars are involved in regulating the senescence response of plants to elevated CO2 remains unresolved. Senescence can be delayed or accelerated in elevated CO2 and no clear relationship between sugar accumulation and senescence has been found. Plasticity in the response to environmental factors, such as daylength and sugar accumulation, varies between different Arabidopsis accessions. This natural variation can be exploited to analyse the genetic basis of the regulation of senescence and the consequences for growth and fecundity. Different evolutionary strategies, i.e. early senescence combined with a high reproductive effort or late senescence combined with a low reproductive effort, may be an important adaptation of Arabidopsis accessions to their natural habitat.