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Variations in chloroplast movement and chlorophyll fluorescence among chloroplast division mutants under light stress

Journal Article · · Journal of Experimental Botany
DOI:https://doi.org/10.1093/jxb/erx203· OSTI ID:1596264
 [1];  [2];  [3];  [4];  [2];  [5]
  1. Michigan State Univ., East Lansing, MI (United States). Dept. of Plant Biiology; MSU
  2. Michigan State Univ., East Lansing, MI (United States). MSU-DOE Plant Research Laboratory; Michigan State Univ., East Lansing, MI (United States). Dept. of Biochemistry and Molecular Biology
  3. Michigan State Univ., East Lansing, MI (United States). Dept. of Electrical and Computer Engineering
  4. Michigan State Univ., East Lansing, MI (United States). MSU-DOE Plant Research Laboratory; Michigan State Univ., East Lansing, MI (United States). Dept. of Computer Sciences and Engineering
  5. Michigan State Univ., East Lansing, MI (United States). Dept. of Plant Biology
Chloroplasts divide to maintain consistent size, shape, and number in leaf mesophyll cells. Altered expression of chloroplast division proteins in Arabidopsis results in abnormal chloroplast morphology. To better understand the influence of chloroplast morphology on chloroplast movement and photosynthesis, we compared the chloroplast photorelocation and photosynthetic responses of a series of Arabidopsis chloroplast division mutants with a wide variety of chloroplast phenotypes. Chloroplast movement was monitored by red light reflectance imaging of whole plants under increasing intensities of white light. The accumulation and avoidance responses were differentially affected in different mutants and depended on both chloroplast number and morphological heterogeneity. Chlorophyll fluorescence measurements during 5 d light experiments demonstrated that mutants with large-chloroplast phenotypes generally exhibited greater PSII photodamage than those with intermediate phenotypes. No abnormalities in photorelocation efficiency or photosynthetic capacity were observed in plants with small-chloroplast phenotypes. Simultaneous measurement of chloroplast movement and chlorophyll fluorescence indicated that the energy-dependent (qE) and long-lived components of non-photochemical quenching that reflect photoinhibition are affected differentially in different division mutants exposed to high or fluctuating light intensities. We conclude that chloroplast division mutants with abnormal chloroplast morphologies differ markedly from the wild type in their light adaptation capabilities, which may decrease their relative fitness in nature.
Research Organization:
Michigan State Univ., East Lansing, MI (United States). MSU-DOE Plant Research Laboratory
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FG02-06ER15808; FG02-91ER20021
OSTI ID:
1596264
Journal Information:
Journal of Experimental Botany, Journal Name: Journal of Experimental Botany Journal Issue: 13 Vol. 68; ISSN 0022-0957
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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