Plant makes and transports sucrose for store or for use through photosynthesis activity. If photosynthesis was impaired, sucrose starvation will greatly decrease plant growth. In addition, the growth of the cplepa-1 mutant is reduced when grown on soil, and the reduction is increased under high light illumination. Moreover, the cplepa-1 mutant shows a slightly pale green phenotype and impaired chloroplast development. PSII and PSI activities are also decreased when grown on soil. These results indicate that, although cpLEPA is not essential under optimal conditions, it becomes critical under nutrient limitation or light stress conditions. PSII activity, indicated by the Fv/Fm value, revealed enhanced sensitivity to TH-302 918633-87-1 high-light treatment in the cplepa-1 mutant in the absence of lincomycin compared with the wild-type plants. The rate of PSII photoinhibition was similar in the mutant and wild-type plants in the presence of the protein synthesis inhibitor lincomycin. The adverse effect of high light on the cplepa-1 mutant indicates that the repair of PSII was perturbed. Thus, cpLEPA might be involved in the regulation of the synthesis of PSII proteins. The association of the chloroplast-encoded psbA, psbB, psaA/ psaB and atpB mRNAs with ribosomes in the mutant grown on soil showed a small shift toward the top of the gradient in the ribosome loading assay, this indicated that translation initiation was impaired in these transcripts. However, the distribution of mutant and wild type plastid 23S rRNA, ndhA, petA and psaJ transcripts were unchanged in the sucrose gradients. Further exploration of the distribution of polysome association revealed that 23S rRNA displayed a different sensitivity to EDTA compared with rbcL mRNA. It is likely that a significant proportion of the 23S rRNA is found in ribonucleoprotein complexes other than polysomes. Alternatively the ribosomes on which these chloroplast mRNAs are translated represent only a small part of the total ribosome pool. The steady-state transcript levels of PEP-dependent genes, including psbA, psbB, rbcL, psaA, atpB and psbD, decreased drastically in cplepa-1 mutants grown on soil. Changes in chloroplast translation might modulate the stability of a subset of chloroplast mRNA molecules. The inactivation of AtprfB affects the polysomal association of the atpE transcript and leads to a 50% reduction in the amount of atpE transcripts. In apg3-1, the abnormal polysomal association of UAG-containing transcripts leads to decreased stability of the transcripts. In hcf173, the decreased ribosomal loading of the psbA transcript affects the stability of the psbA transcript and leads to a significant reduction in its steady-state level. In addition, decreased protein levels of RPOA and RPOB were observed in the cplepa mutant. Thus, it is likely that the dramatic loss in chloroplast transcripts observed in the cplepa mutant might be the synergistic effect of decreased chloroplast translation and decreased PEP transcription. Photosynthetic activity is somewhat impaired in cplepa-1 mutants, which is reflected in the decreased steady-state level of chloroplast proteins. Although a dramatic loss in chloroplast transcripts and a perturbation in chloroplast polysome loading were observed in the cplepA mutant, only an approximate 20% decrease was observed in the steady-state levels of the proteins. One possibility is that chloroplast genes are transcribed in excess. The rpoA mRNA levels are 30-fold higher than the rpoB mRNA levels, but the steady-state protein level of RpoB is approximately 50% of that of RpoA. Similarly, the psbA mRNA levels are fivefold greater than those of the psaA-psaB transcripts because of the increased turnover rate of psbA needed to maintain normal photosynthetic activity, whereas the protein levels of these genes remain similar.