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Medicago truncatula strain:A17

ABSTRACT: Comparative transcriptomics in Medicago truncatula nodule development

PROVIDER: PRJNA391316 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR5740860_1.fastq.gz	Fastqsanger.gz
	SRR5740860_2.fastq.gz	Fastqsanger.gz
	SRR5740870_1.fastq.gz	Fastqsanger.gz
	SRR5740870_2.fastq.gz	Fastqsanger.gz
	SRR5740861_1.fastq.gz	Fastqsanger.gz

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Project description:Rhizobium and allied bacteria form symbiotic nitrogen-fixing nodules on legume roots. Plant hormones appear to play a role in nodule formation. We treated Medicago truncatula roots with auxin transport inhibitors (ATIs) N-(1-naphthyl)phthalamic acid (NPA) and 2,3,5-triiodobenzoic acid (TIBA) to induce the formation of pseudonodules. We compared the transcriptional responses of M. truncatula roots treated with ATIs to roots inoculated with Sinorhizobium meliloti. The transcriptional response of M. truncatula roots 1 and 7 days after ATI treatment were opposite to roots treated with S. meliloti.

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MtBZR1 plays an important role in nodule development in Medicago truncatula

Project description:Brassinosteroid (BR) is an essential hormone in plant growth and development. BR signaling pathway has been extensively studied, in which Brassinazole resistant 1 (BZR1) functions as a key regulator. Here, we carried out a functional study of the homolog of BZR1 in Medicago truncatula, whose expression was induced in nodules upon rhizobial inoculation. We identified a loss-of-function mutant mtbzr1-1 and generated 35S:MtBZR1 transgenic lines for further analysis at the genetic level. Both the mutant and the overexpressor lines of MtBZR1 showed no obvious phenotypic changes under normal growth condition. After rhizobial inoculation, however, the shoot and root dry mass was reduced in mtbzr1-1 compared with the wild-type, caused by partially impaired nodule development. The transcriptomic analysis identified 1,319 differentially expressed genes in mtbzr1-1 compared with wild-type, many of which are involved in nodule development and secondary metabolite biosynthesis. Our results demonstrate an essential role of MtBZR1 in nodule development in M. truncatula, shedding light on the potential role of BR in legume-rhizobium symbiosis.

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