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ABSTRACT: THALLI

PROVIDER: PRJNA1042949 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	SRR26903000_1.fastq.gz	Fastqsanger.gz
	SRR26903000_2.fastq.gz	Fastqsanger.gz
	SRR26903100_1.fastq.gz	Fastqsanger.gz
	SRR26903100_2.fastq.gz	Fastqsanger.gz
	SRR26903001_1.fastq.gz	Fastqsanger.gz

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Project description:The growth orientation of the Marchantia polymorpha thallus – a system of dorsiventralized, indeterminate axes – is modulated by light. We show that red and blue light act antagonistically to control thallus flatness, with red light signalling promoting epinasty and blue light signalling promoting hyponasty. We found that loss-of-function mutations in the blue light receptor MpPHOT led to epinasty, while loss-of-function mutations in the red light receptor MpPHY resulted in hyponasty. We hypothesize that these antagonistic activities of blue and red light signalling are balanced in white light, resulting in the development of flat thalli. Using time-resolved transcriptomics, we identified genes that were rapidly induced upon light exposure. Among these genes were all six members of the M. polymorpha BBX gene family. Mutants harbouring loss-of-function mutations in two of the six MpBBX transcription factors developed defective thalli. Mpbbx1 loss-of-function mutants formed hyponastic thalli, while Mpbbx5 loss-of-function mutants developed epinastic thalli. Double mutants Mpbbx1 Mpbbx5 grew flat, supporting the hypothesis that they function antagonistically. Together, these data indicate that phototropin-mediated blue light and phytochrome-mediated red light signalling antagonistically modulate thallus flatness, and that BBX transcription factors also act antagonistically to regulate thallus flatness.

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