Biochemical and molecular characterization of photosystem I deficiency in the NCS6 mitochondrial mutant of maize.
Interorganellar signaling interactions are poorly understood. The maize non-chromosomal stripe (NCS) mutants provide models to study the requirement of mitochondrial function for chloroplast biogenesis and photosynthesis. Previous work suggested that the NCS6 mitochondrial mutation, a cytochrome oxidase subunit 2 (cox2) deletion, is associated with a malfunction of Photosystem I (PSI) in defective chloroplasts of mutant leaf sectors (Gu et al., 1993). We have now quantified the reductions of photosynthetic rates and PSI activity in the NCS6 defective stripes. Major reductions of the plastid-coded PsaC and nucleus-coded PsaD and PsaE PSI subunits and of their corresponding mRNAs are seen in mutant sectors; however, although the psaA/B mRNA is greatly reduced, levels of PsaA and PsaB (the core proteins of PSI) are only slightly decreased. Levels of the PsaL subunit and its mRNA appear to be unchanged. Tested subunits of other thylakoid membrane complexes--PSII, Cyt b6/f, and ATP synthase, have minor (or no) reductions within mutant sectors. The results suggest that specific signaling pathways sense the dysfunction of the mitochondrial electron transport chain and respond to down-regulate particular PSI mRNAs, leading to decreased PSI accumulation in the chloroplast. The reductions of both nucleus and plastid encoded components indicate that complex interorganellar signaling pathways may be involved.
Jiao
Shunxing
S
Division of Biological Sciences, University of Missouri, Columbia, Missouri 65211, USA.
Thornsberry
Jeffry M
JM
Elthon
Thomas E
TE
Newton
Kathleen J
KJ
D015152:Blotting, Northern; D002736:Chloroplasts / Q000502:physiology; D004272:DNA, Mitochondrial / Q000235:genetics*; D004579:Electron Transport; D003576:Electron Transport Complex IV / Q000235:genetics*; D017353:Gene Deletion; D015151:Immunoblotting; D045342:Light-Harvesting Protein Complexes / Q000235:genetics / Q000378:metabolism; D009154:Mutation; D010788:Photosynthesis / Q000502:physiology; D045331:Photosystem I Protein Complex / Q000235:genetics / Q000378:metabolism*; D045332:Photosystem II Protein Complex / Q000235:genetics / Q000378:metabolism; D018515:Plant Leaves / Q000235:genetics / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020524:Thylakoids / Q000502:physiology; D003313:Zea mays / Q000235:genetics* / Q000378:metabolism
D004272:DNA, Mitochondrial; D045342:Light-Harvesting Protein Complexes; D045331:Photosystem I Protein Complex; D045332:Photosystem II Protein Complex; D010940:Plant Proteins; D012333:RNA, Messenger; C089909:photosystem I, psaB subunit; D003576:Electron Transport Complex IV