Stay-Green Not Always Stays Green Salma Balazadeh  Molecular Plant  Volume 7, Issue 8, Pages 1264-1266 (August 2014) DOI: 10.1093/mp/ssu076 Copyright © 2014 The Authors. All rights reserved. Terms and Conditions

Figure 1 Model for SGR2 Function during Leaf Senescence in Arabidopsis. Expression of SGR1 and SGR2 is low in young (green) leaves, but increases at later stages of leaf development (or during dark-induced leaf senescence); SRGL shows the opposite expression pattern. Expression of CCEs increases during senescence (indicated by circle size). While SGR1 interacts with components of LHCII and CCEs to stimulate Chl breakdown, SGR2 interacts with LHCII and SGR1. It is proposed that SGR1–SGR2 heterodimerization in green leaves inhibits access of SGR1 to CCEs and thereby limits Chl breakdown. Upon the progression of senescence, SRG1 protein may accumulate over SRG2 to favor the formation of SGR1–SGR1 homodimers which are able to interact with CCEs to facilitate Chl degradation. SGRL might be involved in Chl turnover in pre-senescent leaves. Abbreviations are explained in the main text. Molecular Plant 2014 7, 1264-1266DOI: (10.1093/mp/ssu076) Copyright © 2014 The Authors. All rights reserved. Terms and Conditions