Downregulation of chloroplast protease AtDeg5 leads to changes in chronological progression of ontogenetic stages, leaf morphology and chloroplast ultrastructure in Arabidopsis
Downregulation of chloroplast protease AtDeg5 leads to changes in chronological progression of ontogenetic stages, leaf morphology and chloroplast ultrastructure in Arabidopsis
The chloroplast protein AtDeg5 is a serine-type protease peripherally attached to thylakoid membrane at its lumenal
side. Since reliable data regarding the role of AtDeg5 in controlling the course of growth and developmental processes are
extremely limited, two independent T-DNA insertional lines with different extent of AtDeg5 reduction were prepared and
ontogenesis stage-based analysis performed. Both mutant lines displayed a compensatory overaccumulation of AtDeg8.
The repression of AtDeg5 protease altered a range of phenotypic features in at least one of the mutants, with the most
prominent being changes in chronological progression of development and growth of individual rosette leaves, flower
production and silique ripening as well as in the area of fully expanded leaves and chloroplast ultrastructure. By analyzing
the results of parallel-mutant screening we conclude that AtDeg8 overdose may rescue 23% of AtDeg5 deficiency with
regard to some AtDeg5-controlled traits; alternatively AtDeg5 may have catalytic sites in excess so that these traits might
remain unaltered when AtDeg5 pool is reduced by 23%. For some other AtDeg5-dependent traits the absence of excessive
amount of AtDeg5 catalytic sites, lack of AtDeg5 dosage effect and inability of AtDeg8 to compensate deficiency or
absence of AtDeg5 occurred.
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