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Lotus japonicus strain:Miyakojima MG-20

ABSTRACT: Transcriptome analysis in response to symbiotic nitrogen fixation in Lotus japonicus.

PROVIDER: PRJDB16001 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	DRR483565_1.fastq.gz	Fastqsanger.gz
	DRR483565_2.fastq.gz	Fastqsanger.gz
	DRR483566_1.fastq.gz	Fastqsanger.gz
	DRR483566_2.fastq.gz	Fastqsanger.gz
	DRR483567_1.fastq.gz	Fastqsanger.gz

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Gene expression during root nodule development in wild type and Fix- mutant of Lotus japonicus

Project description:RNA-seq analysis was performed to know the expression profiles of Lotus japonicus genes during nodule development and nitrogen fixation.

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Lotus japonicus strain:Miyakojima MG-20

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CPOP1 is the key heme synthesis enzyme required for nodule microenvironment control and successful symbiotic nitrogen fixation in Lotus japonicus

Project description:Heme is utilized as the cofactor of diverse proteins and plays critical roles in different redox reactions. The fixation active nodules of legumes are abundant with heme-containing leghemoglobin to buffer the oxygen concentration. Symbiotic rhizobia could also synthesize heme, and employ heme for efficient respiration and iron uptake regulation. However, the role and regulation of host-controlled heme production during symbiotic nitrogen fixation have not been directly investigated and experimentally proved. Here, we identified the coproporphyrinogen III oxidase plastid related 1 (CPOP1) as a key regulator of symbiotic heme synthesis enzyme in Lotus japonicus. CPOP1 is specifically highly expressed in nitrogen-fixing nodules, and knocking out CPOP1 alone causes leaf etiolation and dwarfism which could be fully recovered by the exogenous application of nitrogen source, indicating nitrogen fixation defect. The cpop1 mutant shows significantly increased nodule oxygen level and decreased nitrogen fixation activity compared to the wild type (WT). Moreover, cell division and related gene expression of bacteroids are also affected upon CPOP1 knockout. We conclude that CPOP1 is essential for the microaerophilic environment control of infected cells and the activation of rhizobial nitrogenase required for symbiotic nitrogen fixation, through host-regulated nodule heme synthesis.

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Dataset Lotus Japonicus root exudates

Project description:The present dataset is composed of Lotus japonicus root exudate samples under different nitrogen states: starved (no nitrogen), inorganic N (KNO3), symbiotic N (inoculation with M. loti), and inorganic/symbiotic (KNO3 + M. loti). The samples were analyzed by ultra-high-performance liquid chromatography (UHPLC) coupled to a quadrupole time-of-flight mass spectrometer (qToF MS, Bruker Compact) with electrospray ionization.

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Lotus japonicus strain:Miyakojima MG-20

Project description:Identification of the causative gene of Lotus japonicus late nodulation mutant

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Lotus japonicus strain:Miyakojima MG-20

Project description:Identification of the causative gene of Lotus japonicus nitrate unresponsive symbiosis 2 mutant

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Cell-type specific transcriptome analysis in nodules of Lotus japonicus

Project description:Legume plants can establish symbiotic nitrogen fixation (SNF) with rhizobia mostly in root nodules, where rhizobia-infected cells are accompanied with uninfected cells in a mosaic pattern. Inside the mature nodules of legume, carbon and nitrogen nutrients between host plant cells and their resident bacteria are actively exchanged. To elucidate the metabolite dynamics relevant for SNF in nodules, three cell-types from nodule tissues of a model legume, Lotus japonicus, were isolated using laser microdissesction, and transcriptome analysis was done by an oligoarray with 60-mer length representing 21,495 genes. In our cell-type-specific profiling, many genes were identified as being expressed in nodules with spatial-specific manners. Among them, genes coding for metabolic enzymes were classified according to their function, and detailed data analysis figured out that secondary metabolic pathway was highly activated in nodule cortex. In particular, a number of metabolic genes for phenyl propanoid pathway were found as highly expressed genes accompanied with those encoding putative transporters of secondary metabolites. These data suggest the involvement of novel physiological function of phenylpropanoids in SNF. Gene expression in three different cell-types of Lotus japonicus nodule was measured. Three independent experiments were performed at each cell-types.

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Transcriptomic changes in Medicago truncatula and Lotus japonicus root nodules during drought stress

Project description:Drought is one of the major environmental factors limiting biomass and seed yield production in agriculture. In this research we focused on plants from Fabaceae family, which have a unique ability for establishment of symbiosis with nitrogen-fixing bacteria, and are relatively susceptible to water limitation. We present the changes in nitrogenase activity and global gene expression occurring in Medicago truncatula and Lotus japonicus root nodules during water deficit. Our results prove a decrease in the efficiency of nitrogen fixation as well as extensive changes in plant and bacterial transcriptomes shortly after watering cessation. We show for the first time that not only symbiotic plant component, but also Sinorhizobium meliloti and Mesorhizobium loti bacteria residing in the root nodules of M. truncatula and L. japonicus, respectively, adjust their gene expression in response to water shortage. Although our results demonstrate that both M. truncatula and L. japonicus root nodules are susceptible to water deprivation, they indicate significant differences in plant and bacterial response to drought between tested species, which may be related to various type of root nodules formed by these species.

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