Journal
PLANT PHYSIOLOGY
Volume 127, Issue 3, Pages 876-886Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1104/pp.127.3.876
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Funding
- NIGMS NIH HHS [T32 GM07215, T32 GM007215] Funding Source: Medline
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It has long been known that leaf senescence can be induced in many plant species by detaching leaves and placing them in the darkness. It recently has been shown that entire Arabidopsis plants placed in the darkness are not induced to senesce, as judged by visible yellowing and certain molecular markers. Here, we show that when individual Arabidopsis leaves are darkened, but not when entire plants are darkened, senescence is induced in the covered leaves. This induction of senescence is highly localized. The phenomenon is leaf age dependent in that it occurs more rapidly and strongly in older leaves than in younger ones, as is the case with many forms of induced senescence. Whole adult plants placed in darkness, in contrast, show delayed senescence, although seedlings lacking primary leaves do not. These observations imply that the light status of the entire plant affects the senescence of individual leaves. A model summarizing the results is presented.
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