Leaf senescence: gene expression and regulation.
Leaf senescence: gene expression and regulation.
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叶子衰老：基因表达和调控。
DOI：
10.1007/978-1-4615-5925-2_12
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发表时间：
1997
影响因子：
6.4
通讯作者：
R. Amasino
中科院分区：
文献类型：
--
作者：
L. M. Weaver;E. Himelblau;R. Amasino
每个秋天叶子的衰老都会在地球上留下痕迹，其形式是从太空中可以看到的颜色的巨大变化。每年，叶子衰老会导致 3 亿吨叶绿素分解，同时将绿色森林和田野变成黄色和橙色 (1)。这些颜色变化的戏剧性与它们背后的细胞事件的戏剧性本质相匹配。 1961 年，Leopold (2) 将叶子衰老描述为“植物形态、色素沉着和内部营养的显着变化”，具有“积极的生态或生理价值”。对植物的好处是从已达到光合作用生产力终点的叶子中回收氮和其他营养物质。这种回收需要叶绿体的分解，分解产物转化为可移位的分子，以及这些分子从衰老的叶子移动到植物的生长区域，包括年轻的叶子和正在发育的果实。这些事件一起被称为“衰老综合症”。目前，许多实验室正在扩大衰老综合征的定义，以涵盖这一重要过程的分子和遗传成分。现在，叶子衰老被认为是一种核调节的发育途径，有助于从枯萎的叶子中回收养分。
Each autumn leaf senescence leaves its mark on the planet in the form of dramatic changes in color that can be seen from space. Annually, leaf senescence mediates the breakdown of 300 million tons of chlorophyll while changing green forests and fields to yellow and orange (1). The drama of these color changes is matched by the dramatic nature of the cellular events that underlie them. In 1961, Leopold (2) described leaf senescence as “distinctive changes in morphology, pigmentation, and internal nutrition of the plant” with “positive ecological or physiological value.” The benefit to the plant is the reclamation of nitrogen and other nutrients from leaves that have reached the end of their photosynthetic productivity. This reclamation entails the breakdown of the chloroplasts, the conversion of breakdown products into translocatable molecules and the movement of those molecules from the senescing leaf to growing regions of the plant, including the younger leaves and developing fruits. Together, these events are known as the “senescence syndrome.” Currently, numerous laboratories are expanding the definition of the senescence syndrome to encompass the molecular and genetic components of this important process. Leaf senescence is now understood to be a nuclear-regulated, developmental pathway facilitating the recovery of nutrients from spent leaves.
影响因子：
11.6
作者：
HENSEL, LL;GRBIC, V;BLEECKER, AB
通讯作者：
BLEECKER, AB