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2007 | 29 | 4 |
Tytuł artykułu

Senescence in wheat leaves: is a cysteine endopeptidase involved in the degradation of the large subunit of Rubisco?

Treść / Zawartość
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Języki publikacji
EN
Abstrakty
EN
In wheat (Triticum aestivum L.), leaf senescence can be initiated by different factors. Depending on the plant system (intact plants or detached leaves) or the environmental conditions (light, nutrient availability), the symptoms of senescence differ. The aim of this work was to elucidate the catabolism of ribulose-1,5-bisphosphate carboxylase/ oxygenase (Rubisco, EC. 4.1.1.39) under various senescence-inducing conditions. Leaf senescence was initiated in intact plants by darkness or by N-deprivation and in leaf segments by exposure to light or darkness. Depending on the treatment, a 50 kDa fragment of Rubisco was observed. The formation of this fragment was enhanced by leaf detachment and low light. In segments exposed to high light and in intact plants induced to senesce by N-deprivation, the fragment was essentially absent. Since an antibody against the N-terminus of a large subunit of Rubisco (LSU) did not cross-react with the fragment, it appears likely that a smaller fragment was removed from the N-terminus of LSU. Inhibitor studies suggest that a cysteine endopeptidase was involved in the formation of the 50 kDa fragment. Non-denaturing-PAGE followed by SDS-PAGE revealed that the fragment was produced while LSU was integrated in the holoenzyme complex, and that it remained there after being produced. It remains open how the putative endopeptidase reaches the stromal protein Rubisco. The results indicate that depending on the senescence-inducing conditions, different proteolytic enzymes may be involved. The involvement of vacuolar proteases must be considered as occurring during LSU degradation, which takes place in darkness, low light or under carbon limitation.
Słowa kluczowe
Wydawca
-
Rocznik
Tom
29
Numer
4
Opis fizyczny
p.339-350,fig.,ref.
Twórcy
autor
  • Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013 Bern, Switzerland
autor
  • Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013 Bern, Switzerland
autor
  • Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013 Bern, Switzerland
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Typ dokumentu
Bibliografia
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Identyfikator YADDA
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