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1,710 results for “medicago”

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dryad32/100

Data from: Geographically structured genetic variation in the Medicago lupulina – Ensifer mutualism

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publicApr 2017View details →

dryad32/100

Data from: Rapid evolution of Medicago polymorpha during invasion shifts interactions with the Soybean looper

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publicSep 2019View details →

dryad32/100

Data from: Multiple mutualist effects on genomewide expression in the tripartite association between Medicago truncatula, nitrogen-fixing bacteria and mycorrhizal fungi

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publicAug 2016View details →

dryad32/100

Plant circadian clock control of Medicago truncatula nodulation involving regulation of Nodule Cysteine-Rich genes

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publicFeb 2022View details →

dryad32/100

Data from: Evolutionary networks from RADseq loci point to hybrid origins of Medicago carstiensis and Medicago cretacea

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publicAug 2020View details →

dryad32/100

Data from: Adaptation to climate through flowering phenology: a case study in Medicago truncatula

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publicMay 2016View details →

dryad32/100

Data from: Allele phasing is critical to revealing a shared allopolyploid origin of Medicago arborea and M. strasseri (Fabaceae)

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publicJan 2018View details →

dryad32/100

Plant growth over one growing season of Medicago truncatula in competition with conspecifics of different genetic relatedness

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publicAug 2022View details →

dryad28/100

Data from: Selection, genome-wide fitness effects and evolutionary rates in the model legume Medicago truncatula

Sequence data for >20 000 annotated genes from 56 accessions of Medicago truncatula were used to identify potential targets of positive selection, the determinants of evolutionary rate variation and the relative importance of positive and purifying selection in shaping nucleotide diversity. Based upon patterns of intraspecific diversity and interspecific divergence, c. 50–75% of nonsynonymous polymorphisms are subject to strong purifying selection and 1% of the sampled genes harbour a signature of positive selection. Combining polymorphism with expression data, we estimated the distribution of fitness effects and found that the proportion of deleterious mutations is significantly greater for expressed genes than for genes with undetected transcripts (nonexpressed) in a previous RNA-seq experiment and greater for broadly expressed genes than those expressed in only a single tissue. Expression level is the strongest correlate of evolutionary rates at nonsynonymous sites, and despite multiple genomic features being significantly correlated with evolutionary rates, they explain less than 20% of the variation in nonsynonymous rates (dN) and <15% of the variation in either synonymous rates (dS) or dN:dS. Among putative targets of selection were genes involved in defence against pathogens and herbivores, genes with roles in mediating the relationship with rhizobial symbionts and one-third of annotated histone-lysine methyltransferases. Adaptive evolution of the methyltransferases suggests that positive selection in gene expression may have occurred through evolution of enzymes involved in epigenetic modification.

opencc-zeroDec 2012View details →

dryad28/100

Data from: Nod factors potentiate auxin signaling for transcriptional regulation and lateral root formation in Medicago truncatula

Nodulation (Nod) factors (NFs) are symbiotic molecules produced by rhizobia that are essential for establishment of the rhizobium–legume endosymbiosis. Purified NFs can stimulate lateral root formation (LRF) in Medicago truncatula, but little is known about the molecular mechanisms involved. Using a combination of reporter constructs, pharmacological and genetic approaches, we show that NFs act on early steps of LRF in M. truncatula, independently of the ethylene signaling pathway and of the cytokinin receptor MtCRE1, but in interaction with auxin. We conducted a whole-genome transcriptomic study upon NF and/or auxin treatments, using a lateral root inducible system adapted for M. truncatula. This revealed a large overlap between NF and auxin signaling and, more interestingly, synergistic interactions between these molecules. Three groups showing interaction effects were defined: group 1 contained more than 1500 genes responding specifically to the combinatorial treatment of NFs and auxin; group 2 comprised auxin-regulated genes whose expression was enhanced or antagonized by NFs; and in group 3 the expression of NF regulated genes was antagonized by auxin. Groups 1 and 2 were enriched in signaling and metabolic functions, which highlights important crosstalk between NF and auxin signaling for both developmental and symbiotic processes.

opencc-zeroDec 2016View details →

dryad28/100

Data from: Phylogenetic signal variation in the genomes of Medicago (Fabaceae)

Genome-scale data offer the opportunity to clarify phylogenetic relationships that are difficult to resolve with few loci, but they can also identify genomic regions with evolutionary history distinct from that of the species history. We collected whole-genome sequence data from 29 taxa in the legume genus Medicago, then aligned these sequences to the M. truncatula reference genome to confidently identify 87,596 variable homologous sites. We used this data set to estimate phylogenetic relationships among Medicago species, to investigate the number of sites needed to provide robust phylogenetic estimates, and to identify specific genomic regions supporting topologies in conflict with the genome-wide phylogeny. Our full genomic data set resolves relationships within the genus that were previously intractable. Sub-sampling the data reveals considerable variation in phylogenetic signal and power in smaller subsets of the data. Even when sampling 5,000 sites, no random sample of the data supports a topology identical to that of the genome-wide phylogeny. Phylogenetic relationships estimated from 500-site sliding windows revealed genome regions supporting several alternative species relationships among recently-diverged taxa, consistent with the expected effects of deep coalescence or introgression in the recent history of Medicago.

opencc-zeroDec 2012View details →

zenodo28/100