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Genome sequencing of oak (v2)

ABSTRACT: Genome sequencing and assembly of Quercus robur (Pedunculate oak) haploid genome

PROVIDER: PRJEB19898 | ENA |

REPOSITORIES: ENA

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	Qrob_H2.3_Genes_v2.2_annot.embl.gz	Other

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Genome sequencing of oak

Project description:Genome sequencing of Quercus robur (Pedunculate oak)

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Project description:Priming of plant defenses provides increased plant protection against herbivores and reduces the allocation costs of defense. Defense priming in woody plants remains obscure, in particular due to plant development traits such as the endogenous rhythmic growth displayed by oaks (Quercus robur). By using bioassays with oak microcuttings, and by combining transcriptomic and metabolomic analyses, we investigated how leaf herbivory by Lymantria dispar and root inoculation with the ectomycorrhizal fungus Piloderma croceum prime oak defenses. We further investigated how defense priming is modulated by rhythmic growth of the oaks. A first herbivory challenge in oak leaves primed newly grown leaves for an enhanced induction of jamonic acid (JA)-related direct defenses, or enhanced emission of volatiles, depending on the specific growth stage at which the plants where challenged. Root inoculation with Piloderma abolished the enhanced induction of JA-related defenses and volatile emission. Our results indicate that a first herbivore attack primes direct and indirect defenses of newly formed oak leaves, and that the specific display of defense priming is modulated by rhythmic growth. Our results further show that the priming memory in oaks can be transmitted to the next growth cycle even to the leaves of the new shoot unit.

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Project description:This work aimed to characterize the molecular adaptations occurring in cork oak (Quercus suber) stems in adaptation to drought, and identify key genetic pathways regulating phellem development. One-year-old cork oak plants were grown for additional 6 months under well-watered (WW) or water-deficit (WD) conditions and main stems were targeted for transcriptomic analysis. WD had a negative impact on secondary growth, decreasing the activity of the vascular cambium and phellogen. Following a tissue-specific approach, we analyzed the transcriptional changes imposed by WD in phellem (outer bark), inner bark, and xylem, and found a global downregulation of genes related to cell division, cell wall biogenesis, lignin and/or suberin biosynthesis. Phellem and phloem showed a concerted upregulation of photosynthesis-related genes, suggesting a determinant role of stem photosynthesis in the adaptation of young plants to long-term drought. The data gathered will be important to further harness the diverse genetic background of this species for the development of optimized management practices.

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