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Optimization of Light-Harvesting Pigment Improves Photosynthetic Efficiency
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Journal Article
Optimization of Light-Harvesting Pigment Improves Photosynthetic Efficiency
2016
Overview
Maximizing light capture by light-harvesting pigment optimization represents an attractive but challenging strategy to improve photosynthetic efficiency. Here, we report that loss of a previously uncharacterized gene, HIGH PHOTOSYNTHETIC EFFICIENCY1 (HPE1), optimizes light-harvesting pigments, leading to improved photosynthetic efficiency and biomass production. Arabidopsis (Arabidopsis thaliana) hpe1 mutants show faster electron transport and increased contents of carbohydrates. HPE1 encodes a chloroplast protein containing an RNA recognition motif that directly associates with and regulates the splicing of target RNAs of plastid genes. HPE1 also interacts with other plastid RNA-splicing factors, including CAF1 and OTP51, which share common targets with HPE1. Deficiency of HPE1 alters the expression of nucleus-encoded chlorophyll-related genes, probably through plastid-to-nucleus signaling, causing decreased total content of chlorophyll (a+b) in a limited range but increased chlorophyll a/b ratio. Interestingly, this adjustment of light-harvesting pigment reduces antenna size, improves light capture, decreases energy loss, mitigates photodamage, and enhances photosynthetic quantum yield during photosynthesis. Our findings suggest a novel strategy to optimize light-harvesting pigments that improves photosynthetic efficiency and biomass production in higher plants.
Publisher
American Society of Plant Biologists
Subject
/ Arabidopsis - radiation effects
/ Arabidopsis Proteins - genetics
/ Arabidopsis Proteins - metabolism
/ Biomass
/ Carbohydrate Metabolism - radiation effects
/ Cell Nucleus - radiation effects
/ Down-Regulation - radiation effects
/ GENES, DEVELOPMENT, AND EVOLUTION
/ Light
/ Light-Harvesting Protein Complexes - metabolism
/ Metabolome - radiation effects
/ Photosynthesis - radiation effects
/ Pigments, Biological - metabolism
/ Plastids - radiation effects
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