Photosynthesis in Arabidopsis thaliana mutants with reduced chloroplast number

Photosynth Res. 2005 Sep;85(3):373-84. doi: 10.1007/s11120-005-7708-x.


We have used a class of Arabidopsis mutants altered in the accumulation and replication of chloroplasts (arc mutants) to investigate the effect of reduced chloroplast number on the photosynthetic competence of leaves. Each of the arc mutants examined (arc3, arc5, and arc6) accumulate only a few (2-15) large chloroplasts per mesophyll cell. The increased plastid size maintains a constant plastid to mesophyll cell volume, which has been suggested to compensate for the lower chloroplast number. In fact, we find that reduced chloroplast number has an effect on both the composition and structure of the photosynthetic apparatus, and that each arc mutant has an altered photosynthetic capacity, and we conclude that photosynthetic competence is dependent on proper chloroplast division and development.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Arabidopsis / cytology*
  • Arabidopsis / genetics
  • Arabidopsis / metabolism*
  • Arabidopsis / radiation effects
  • Arabidopsis Proteins / genetics
  • Chlorophyll / metabolism
  • Chloroplasts / metabolism
  • Chloroplasts / physiology*
  • Chloroplasts / ultrastructure
  • Dynamins / genetics
  • Fluorescence
  • Genotype
  • Light
  • Mutation / genetics*
  • Oxygen / metabolism
  • Photosynthesis / genetics
  • Photosynthesis / physiology*
  • Plant Leaves / metabolism
  • Plant Leaves / radiation effects
  • Plant Leaves / ultrastructure


  • ARC3 protein, Arabidopsis
  • ARC6 protein, Arabidopsis
  • Arabidopsis Proteins
  • Chlorophyll
  • ARC5 protein, Arabidopsis
  • Dynamins
  • Oxygen