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Bacteria associated with surfaces of leafy greens: shift in community structure over time and between leafy green species

ABSTRACT: Analysis of microbial communities in leafy greens using Illumina MiSeq

PROVIDER: PRJEB6233 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR493536_1.fastq.gz	Fastqsanger.gz
	ERR493536_2.fastq.gz	Fastqsanger.gz
	ERR493537_1.fastq.gz	Fastqsanger.gz
	ERR493537_2.fastq.gz	Fastqsanger.gz
	ERR493538_1.fastq.gz	Fastqsanger.gz

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Leafy Greens

Project description:Leafy Greens Metagenome

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Bacterial communities associated with surfaces of leafy greens: shift in composition and decrease in richness over time.

Project description:The phyllosphere is colonized by a wide variety of bacteria and fungi; it harbors epiphytes, as well as plant-pathogenic bacteria and even human pathogens. However, little is known about how the bacterial community composition on leafy greens develops over time. The bacterial community of the leafy-green phyllosphere obtained from two plantings of rocket salad (Diplotaxis tenuifolia) and three plantings of lettuce (Lactuca sativa) at two farms in Norway were profiled by an Illumina MiSeq-based approach. We found that the bacterial richness of the L. sativa samples was significantly greater shortly (3 weeks) after planting than at harvest (5 to 7 weeks after planting) for plantings 1 and 3 at both farms. For the second planting, the bacterial diversity remained consistent at the two sites. This suggests that the effect on bacterial colonization of leaves, at least in part must, be seasonally driven rather than driven solely by leaf maturity. The distribution of phyllosphere communities varied between D. tenuifolia and L. sativa at harvest. The variability between these species at the same location suggests that the leaf-dwelling bacteria are not only passive inhabitants but interact with the host, which shapes niches favoring the growth of particular taxa. This work contributes to our understanding of host plant-specific microbial community structures and shows how these communities change throughout plant development.

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Project description:The goal of this study was to identify signaling processes associated with infection and recovery of leafy spurge inoculated with Xanthomonas axonopodis pv. manihotis (Xam). Two dye-swap technical replicates for each of 3 biological replicates for each treatment were analyzed. A time course analysis of Xam infected and mock inoculated leafy spurge was performed. Time points were 1, 7 and 21 days after inoculation (or mock inoculation). Thus, 36 labeled samples were hybridized in a 2 dye rolling circle hybridization scheme to 18 arrays.

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Project description:This submission contains the RNAseq data from one (just the study on paradormancy release) of several studies used to assemble the leafy spurge tranacriptome. These assembled transcrptome was built from 1) A study of leafy spurge crown buds through a time course for paradormancy release induced by excision of the aerial portion of the shoot (this study). 2) A study of leafy spurge crown buds through a seasonal dormancy time course where buds transitioned from paradoprmancy to endodormancy and then to ecodormancy (Series GSE71321). 3) A study identical to #2 above but where leafy spurge plants were first treated with glyphosate (Series GSE71406). 4) A previously submitted study (Series GSE56509) of leafy spurge shoots following treament with glyphosate was also used to assemble the transcriptome.

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Expression analysis of leafy spurge crown buds during seasonal dormancy transitions after glyphosate treatments.

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