Project description:For identification of plant gene networks which interact to initiate and support both rhizobial nodulation and AM fungal colonization, the transcription profiles of soybean genes induced during rhizobial, AM and their dual symbioses.
Project description:We have undertaken a detailed study to identify mechanisms regulating expression of NCRs. We used a custom Affymetrix oligonucleotide microarray to examine the expression changes of 566 NCRs in different stages of nodule development. Additionally, rhizobial mutants were used to understand the importance of the rhizobial components in induction of NCRs. Early NCRs were detected during the initial infection of rhizobia in nodules and continue to be expressed into the late stages of nodule development. Late NCRs were induced concomittant with bacteroid development in the nodules. The induction of these groups of genes was correlated with the number and morphology of rhizobia in the nodule.
2013-03-05 | GSE34803 | GEO
Project description:Rhizobial community in kudzu rhizosphere
Project description:We treated Populus tremula x alba roots with rhizobial LCOs. We analyzed gene expression by RNA sequencing at seven time-points: 0 hr (control treatment), 15, 30 min, 1, 2, 4, 8, 24 hours over the following 24 hours.
Project description:We analysed the transcriptomic response of 3 rhizobial symbionts of Mimosa pudica (Rhizobium mesoamericanum STM3625, Cupriavidus taiwanensis LMG19424 and Burkholderia phymatum STM815) when cultivated in a minimum culture medium (control condition) versus induced by root exudates of their host plant Mimosa pudica. We used RNAseq using illumina technology.
Project description:Legumes interact with rhizobia, leading to the development of root nodules. Diffusible rhizobial signals were identified as Nod-LCOs. Applying Nod-LCOs on plantlet roots, we used GeneChips to detail the global programme of gene expression in response to the external application of Nod-LCOs.
Project description:We have undertaken a detailed study to identify mechanisms regulating expression of NCRs. We used a custom Affymetrix oligonucleotide microarray to examine the expression changes of 566 NCRs in different stages of nodule development. Additionally, rhizobial mutants were used to understand the importance of the rhizobial components in induction of NCRs. Early NCRs were detected during the initial infection of rhizobia in nodules and continue to be expressed into the late stages of nodule development. Late NCRs were induced concomittant with bacteroid development in the nodules. The induction of these groups of genes was correlated with the number and morphology of rhizobia in the nodule. We used a custom Affymetrix chip containing 684 probe sequences of Medicago DEFLs to explore the expression patterns of NCRs in nodules inoculated with Sinorhizobium meliloti 1021(Sm1021) at marked developmental stages and nodules inoculated with various mutants derived from Sm1021 totalling 14 different treatments. Each treatment was supported by three biological replicates giving a grand total of 42 samples.
Project description:It is well-known that individual pea (Pisum sativum L.) cultivars differ in their symbiotic responsivity. This trait is typically manifested with an increase in seed weights due to inoculation with rhizobial bacteria and arbuscular mycorrhizal fungi. The aim of this work was to characterize the alterations in root proteome of highly responsive pea genotype k-8274 and low-responsive genotype k-3358 grown in non-sterile soil, which were associated with root colonization with rhizobial bacteria and arbuscular mycorrhiza fungi in comparison to proteome shifts caused by soil supplementation with mineral nitrogen salts. Our results clearly indicate that supplementation of the soil with mineral nitrogen-containing salts switched the root proteome of both genotypes to assimilation of the available nitrogen, whereas the processes associated with nitrogen fixation were suppressed. Surprisingly, inoculation with rhizobial bacteria had only a minor effect on root proteomes of the both genotypes. The most pronounced response was observed for highly responsive k-8274 genotype inoculated simultaneously with rhizobial bacteria and arbuscular mycorrhizal fungi. This response involved activation of the proteins related to redox metabolism and suppression of excessive nodule formation. In turn, the low-responsive genotype k-3358 demonstrated a pronounced inoculation-induced suppression of protein metabolism and enhanced diverse defense reactions in pea roots under the same soil conditions. The results of the study shed light on the molecular basis of differential symbiotic responsivity in different pea cultivars.
