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ABSTRACT: Cover Cropping Shifts Microbial Life-History Strategies to Promote Necromass Carbon Accumulation through Soil Metabolite Mediation in Orchard Systems

PROVIDER: PRJNA1232846 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR32620460_1.fastq.gz	Fastqsanger.gz
	SRR32620460_2.fastq.gz	Fastqsanger.gz
	SRR32620461_1.fastq.gz	Fastqsanger.gz
	SRR32620461_2.fastq.gz	Fastqsanger.gz
	SRR32620462_1.fastq.gz	Fastqsanger.gz

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Dissecting the Variations of Ripening Progression and Flavonoid Metabolism in Grape Berries Grown under Double Cropping System

Project description:A double cropping system has been commercially adopted in subtropical regions in southern China, where there is abundant sunshine and heat resources. In this viticulture system, the first growing season normally starts as a summer cropping cycle; then, the vine is pruned and forced by hydrogen cyanamide, resulting in a second crop in January of the next year. Due to climate differences between the two growing seasons, flavonoid content and composition varies greatly. In this study, changes in the transcriptome of flavonoid-associated pathways were compared in berries grown under the double cropping system; in addition, the accumulation of flavonoid compounds was compared. Specific alterations in MYB transcription factors occurred in winter cropping berries around veraison. Then, the winter cropping cycle distinctly induced the flavonoid metabolic pathways while triggering the ripening-associated pathways. Notably, the climate conditions in winter cropping positively affected flavonoid biosynthesis, while the summer season took a major toll on anthocyanin accumulation. In addition, the three classes of flavonoid compounds responded differently to the changing climate; the anthocyanins and flavonols were promoted several fold, whereas no consistent increase was found for flavan-3-ols. Conclusively, flavonoid biosynthesis in grapes grown under a double cropping system showed seasonal or climatic-specific accumulation patterns.

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Transcriptomic analyses of bacterial growth on fungal necromass reveals different microbial community niches during degradation

Project description:Bacteria are major drivers of organic matter decomposition and play crucial roles in global nutrient cycling. Although the degradation of dead fungal biomass (necromass) is increasingly recognized as an important contributor to soil carbon (C) and nitrogen (N) cycling, the genes and metabolic pathways involved in necromass degradation are under characterized. In particular, how bacteria degrade necromass containing different quantities of melanin, which largely control rates of necromass decomposition in situ, is largely unknown. To address this gap, we conducted a multi-timepoint transcriptomic analysis using three Gram-negative, bacterial species grown on low or high melanin necromass of Hyaloscypha bicolor. The bacterial species, Cellvibrio japonicus, Chitinophaga pinensis, and Serratia marcescens, belong to genera known to degrade necromass in situ. We found that while bacterial growth was consistently higher on low than high melanin necromass, the CAZyme-encoding gene expression response of the three species was similar between the two necromass types. Interestingly, this trend was not shared for genes encoding nitrogen utilization, which varied in C. pinensis and S. marcescens during growth on high versus low melanin necromass. Additionally, this study tested the metabolic capabilities of these bacterial species to grow on a diversity of C and N sources and found that the three bacteria have substantially different abilities to utilize carbon and nitrogen compounds. Collectively, our data suggests that as necromass changes chemically over the course of degradation, certain bacterial species are favored based on their differential metabolic capacities.

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Project description:Pecan Orchard cover crop research trial

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Melanization of fungal necromass drives the upregulation of multiple chitinase, protease, and laccase genes when being degraded by Trichoderma reesei

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