AtACDO1, an ABC1-like kinase gene, is involved in chlorophyll degradation and the response to photooxidative stress in Arabidopsis

Yang, Songguang; Zeng, Xueqin; Li, Tao; Liu, Ming; Zhang, Shengchun; Gao, Sujuan; Wang, Yaqin; Peng, Changliang; Li, Ling; Yang, Chengwei

doi:10.1093/jxb/ers072

Cited by 43 publications

(32 citation statements)

References 69 publications

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“…Carotenoids were extracted and analyzed as described previously using spectrofluorometry (Yang et al, 2012) and HPLC (Pogson et al, 1996;Li et al, 2009). Pigments were identified by comparing retention times with reference standards.…”

Section: Pigment Analysismentioning

confidence: 99%

Optimization of Light-Harvesting Pigment Improves Photosynthetic Efficiency

Jin

Duan

et al. 2016

Plant Physiol.

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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.

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Section: Pigment Analysismentioning

confidence: 99%

Optimization of Light-Harvesting Pigment Improves Photosynthetic Efficiency

Jin

Duan

et al. 2016

Plant Physiol.

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“…In humans, mutation of an ABC1-like homolog leads to neuromuscular defects such as ataxia (Mollet et al 2008). Recently, two putative kinases have been characterized in Arabidopsis: AtOSA1 (Arabidopsis oxidative stress related ABC1-like protein, At5g64940) localized at the chloroplast inner envelope membrane (Jasinski et al 2008) and AtACDO1 (ABC1-like kinase related to chlorophyll degradation and oxidative stress, At4g31390) (Yang et al 2012). Both were linked to oxidative stress under high light conditions.…”

Section: Abc1-like Kinasesmentioning

confidence: 99%

A mechanism implicating plastoglobules in thylakoid disassembly during senescence and nitrogen starvation

Besagni

Kessler

2012

Planta

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Plastoglobules are lipid droplets present in all plastid types. In chloroplasts, they are connected to the thylakoid membrane by the outer lipid half-bilayer. The plastoglobule core is composed of neutral lipids most prominently the prenylquinones, triacylglycerols, fatty acid phytyl esters but likely also unknown compounds. During stress and various developmental stages such as senescence, plastoglobule size and number increase due to the accumulation of lipids. However, their role is not limited to lipid storage. Indeed, the characterization of the plastoglobule proteome revealed the presence of enzymes. Importantly it has been demonstrated that these participate in isoprenoid lipid metabolic pathways at the plastoglobule, notably in the metabolism of prenylquinones. Recently, the characterization of two phytyl ester synthases has established a firm metabolic link between PG enzymatic activity and thylakoid disassembly during chloroplast senescence and nitrogen starvation.

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“…Additionally, an Arabidopsis insertion mutant of the inner envelope-localized ABC1K8 revealed constitutively high accumulation of reactive oxygen species (ROS) and oxidative stressassociated genes, as well as sensitivity to cadmium stress (Jasinski et al, 2008). Although investigation of the PG-localized ABC1K1 using RNA interference (RNAi) suggested an impairment in chlorophyll degradation, the RNAi strategy used the fulllength coding sequence of the gene, thus targeting many of the ABC1K transcripts and confounding the conclusions (Yang et al, 2012). Kinase activity of any of the ABC1Ks remains to be directly demonstrated, though indirect evidence from point mutants in the ABC1K domain of yeast, human, and bacterial ABC1K proteins strongly supports the putative kinase activity (Lagier-Tourenne et al, 2008;Mollet et al, 2008;Xie et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Loss of Plastoglobule Kinases ABC1K1 and ABC1K3 Causes Conditional Degreening, Modified Prenyl-Lipids, and Recruitment of the Jasmonic Acid Pathway

et al. 2013

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Plastoglobules (PGs) are plastid lipid-protein particles. This study examines the function of PG-localized kinases ABC1K1 and ABC1K3 in Arabidopsis thaliana. Several lines of evidence suggested that ABC1K1 and ABC1K3 form a protein complex. Null mutants for both genes (abc1k1 and abc1k3) and the double mutant (k1 k3) displayed rapid chlorosis upon high light stress. Also, k1 k3 showed a slower, but irreversible, senescence-like phenotype during moderate light stress that was phenocopied by drought and nitrogen limitation, but not cold stress. This senescence-like phenotype involved degradation of the photosystem II core and upregulation of chlorophyll degradation. The senescence-like phenotype was independent of the EXECUTER pathway that mediates genetically controlled cell death from the chloroplast and correlated with increased levels of the singlet oxygen-derived carotenoid b-cyclocitral, a retrograde plastid signal. Total PG volume increased during light stress in wild type and k1 k3 plants, but with different size distributions. Isolated PGs from k1 k3 showed a modified prenyllipid composition, suggesting reduced activity of PG-localized tocopherol cyclase (VTE1), and was consistent with loss of carotenoid cleavage dioxygenase 4. Plastid jasmonate biosynthesis enzymes were recruited to the k1 k3 PGs but not wildtype PGs, while pheophytinase, which is involved in chlorophyll degradation, was induced in k1 k3 and not wild-type plants and was localized to PGs. Thus, the ABC1K1/3 complex contributes to PG function in prenyl-lipid metabolism, stress response, and thylakoid remodeling.

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AtACDO1, an ABC1-like kinase gene, is involved in chlorophyll degradation and the response to photooxidative stress in Arabidopsis

Cited by 43 publications

References 69 publications

Optimization of Light-Harvesting Pigment Improves Photosynthetic Efficiency

Optimization of Light-Harvesting Pigment Improves Photosynthetic Efficiency

A mechanism implicating plastoglobules in thylakoid disassembly during senescence and nitrogen starvation

Loss of Plastoglobule Kinases ABC1K1 and ABC1K3 Causes Conditional Degreening, Modified Prenyl-Lipids, and Recruitment of the Jasmonic Acid Pathway

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