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Loss-of-function mutation of Plastid Terminal Oxidase (ZmPTOX) cause zebra leaf and white kernel by affecting plastid development in maize

ABSTRACT: Loss-of-function mutation of Plastid Terminal Oxidase (ZmPTOX) cause zebra leaf and white kernel by affecting plastid development in maize

PROVIDER: PRJNA1080454 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR28091229_1.fastq.gz	Fastqsanger.gz
	SRR28091229_2.fastq.gz	Fastqsanger.gz
	SRR28091230_1.fastq.gz	Fastqsanger.gz
	SRR28091230_2.fastq.gz	Fastqsanger.gz
	SRR28091231_1.fastq.gz	Fastqsanger.gz

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Loss-of-function mutation of Plastid Terminal Oxidase (ZmPTOX) cause zebra leaf and white kernel by affecting plastid development in maize

Project description:Zebra leaf is a special phenotype of variegated leaf in monocotyledonous plant. Here, we characterized a mutant zebra10 (zb10) in maize, which displays defective chloroplast development in white section of leaves at the seedling stage and pale-white kernels. Map based cloning revealed that ZB10 encodes plastid terminal oxidase (ZmPTOX) which is localized in chloroplasts. ZmPTOX protein is highest expressed in leaves and also highly expressed in endosperm. Expression and metabolism analysis showed that function-loss of PTOX interferes with carotenoid synthesis and chloroplast biogenesis by affecting phytoene desaturase activity. In-depth observation showed that crossband formation of zebra leaf could be related to photoperiodic rhythm, and expression of alternative oxidases 2 (ZmAOX2) could be regulated by circadian rhythm and light intensity in zb10. Further studies revealed ectopic expression of ZmAOX2 protein can function in chloroplasts and rescue the defective phenotype of im. We conclude that ZmPTOX plays an vital role in carotenoid synthesis and plastid biogenesis in maize. ZmAOX2 involve in formation of zebra crossbands with diurnal rhythm and green-revertible process of leaves in zb10.

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Project description:Changing climate impacts all aspects of plant physiology, photosynthesis being particularly affected. Weather extremes result in imbalances between light capture and its assimilation, leading to photoinhibition of photosynthesis, which affects plant growth and crop yields. The Plastid Terminal Oxidase (PTOX) has been suggested as a photoprotective safety valve for photosynthesis. However, a photoprotective activity has only been observed in a small number of species and its mode of activation remains elusive. Previous attempts to induce photoprotective PTOX activity in additional species have failed. Here, we show for the first time that photoprotection by PTOX can be transferred to non-extremophile species, and that can reduce photoinhibition and ROS production under stress. Our findings provide a basis for new approaches to redesign photosynthesis using PTOX, to help crops face the challenges raised by the current climate change scenario.

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