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Background  The Arabidopsis  var2  mutant displays a unique green and white/yellow leaf variegation phenotype and lacks VAR2, a chloroplast FtsH metalloprotease. We are characterizing second-site  var2  genetic suppressors as means to better understand VAR2 function and to study the regulation of chloroplast biogenesis.    Results  In this report, we show that the suppression of  var2  variegation in suppressor line  TAG-11  is due to the disruption of the  SUPPRESSOR OF VARIEGATION3  ( SVR3 ) gene, encoding a putative TypA-like translation elongation factor. SVR3 is targeted to the chloroplast and  svr3  single mutants have uniformly pale green leaves at 22°C. Consistent with this phenotype, most chloroplast proteins and rRNA species in  svr3  have close to normal accumulation profiles, with the notable exception of the Photosystem II reaction center D1 protein, which is present at greatly reduced levels. When  svr3  is challenged with chilling temperature (8°C), it develops a pronounced chlorosis that is accompanied by abnormal chloroplast rRNA processing and chloroplast protein accumulation. Double mutant analysis indicates a possible synergistic interaction between  svr3  and  svr7 , which is defective in a chloroplast pentatricopeptide repeat (PPR) protein.    Conclusions  Our findings, on one hand, reinforce the strong genetic link between VAR2 and chloroplast translation, and on the other hand, point to a critical role of SVR3, and possibly some aspects of chloroplast translation, in the response of plants to chilling stress.

bmc plant biology

A var2 leaf variegation suppressor locus, SUPPRESSOR OF VARIEGATION3, encodes a putative chloroplast translation elongation factor that is important for chloroplast development in the cold