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Mutations in Arabidopsis YCF20-like genes affect thermal dissipation of excess absorbed light energy. | LitMetric

Mutations in Arabidopsis YCF20-like genes affect thermal dissipation of excess absorbed light energy.

Planta

Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720-3102, USA.

Published: March 2010

AI Article Synopsis

Article Abstract

Plants dissipate excess absorbed light energy as heat to protect themselves from photo-oxidative stress. The Arabidopsis thaliana npq6 mutant affected in thermal dissipation was identified by its partial defect in the induction of nonphotochemical quenching of chlorophyll fluorescence (NPQ) by excess light. Positional cloning revealed that npq6 contains a frameshift mutation caused by a single base-pair deletion in the At5g43050 gene, which encodes a member of the hypothetical chloroplast open reading frame 20 (YCF20) family of proteins with unknown function(s). The YCF20 protein family is mostly conserved in oxygenic photosynthetic organisms including cyanobacteria, eukaryotic algae, and plants. Amino acid sequence comparison identified two other genes in Arabidopsis that encode similar proteins to NPQ6: At1g65420 and At3g56830. These three Arabidopsis proteins have functional chloroplast-targeting transit peptides. Using reverse genetics, a mutant with a T-DNA insertion within the At1g65420 gene was identified and shown to exhibit a low NPQ phenotype similar to that of npq6; therefore, At1g65420 was named NPQ7. In contrast, a knockdown mutant in the At3g56830 gene with lower transcript levels showed wild-type levels of NPQ. The npq6 npq7 double mutant had an additive NPQ defect, indicating that the YCF20 family members in Arabidopsis have overlapping functions affecting thermal dissipation.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2820688PMC
http://dx.doi.org/10.1007/s00425-010-1098-9DOI Listing

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