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Plants 2014, 3(4), 498-512; doi:10.3390/plants3040498

Senescence-Associated Vacuoles, a Specific Lytic Compartment for Degradation of Chloroplast Proteins?

Instituto de Fisiología Vegetal (INFIVE, CONICET-UNLP), cc327, La Plata 1900, Argentina
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Received: 19 July 2014 / Revised: 14 September 2014 / Accepted: 15 September 2014 / Published: 11 November 2014
(This article belongs to the Special Issue Plant Vacuole)
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Abstract

Degradation of chloroplasts and chloroplast components is a distinctive feature of leaf senescence. In spite of its importance in the nutrient economy of plants, knowledge about the mechanism(s) involved in the breakdown of chloroplast proteins is incomplete. A novel class of vacuoles, “senescence-associated vacuoles” (SAVs), characterized by intense proteolytic activity appear during senescence in chloroplast-containing cells of leaves. Since SAVs contain some chloroplast proteins, they are candidate organelles to participate in chloroplast breakdown. In this review we discuss the characteristics of SAVs, and their possible involvement in the degradation of Rubisco, the most abundant chloroplast protein. Finally, SAVs are compared with other extra-plastidial protein degradation pathways operating in senescing leaves. View Full-Text
Keywords: senescence-associated vacuoles; leaf senescence; chloroplast degradation; proteases; Rubisco; SAG12 senescence-associated vacuoles; leaf senescence; chloroplast degradation; proteases; Rubisco; SAG12
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Carrión, C.A.; Martínez, D.E.; Costa, M.L.; Guiamet, J.J. Senescence-Associated Vacuoles, a Specific Lytic Compartment for Degradation of Chloroplast Proteins? Plants 2014, 3, 498-512.

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