Spotted gums and hybrids: Impact of pests and diseases, ontogeny and climate on tree performance

Bonora, Flávia Sarti; Hayes, R. Andrew; Nahrung, Helen F.; Lee, David John

doi:10.1016/j.foreco.2020.118235

Cited by 3 publications

(1 citation statement)

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“…Plant cuticular wax compounds perform functions essential for the survival of terrestrial plants, including limiting non-stomatal water loss and gas exchange, protecting from ultraviolet radiation 77 , and forming physical barriers to herbivores and pathogens 78 . Eucalypts in particular require strong defense mechanisms to protect leaves during development, as young trees present large amounts of juvenile foliage making them a target for insect and fungal pests 79 . Eucalyptus grandis and CCV differ somewhat in wax morphology, with E. grandis exhibiting sparser wax coverage and irregular structure compared to Corymbia 80 .…”

Section: Resultsmentioning

confidence: 99%

Pests, diseases, and aridity have shaped the genome of Corymbia citriodora

et al. 2021

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Corymbia citriodora is a member of the predominantly Southern Hemisphere Myrtaceae family, which includes the eucalypts (Eucalyptus, Corymbia and Angophora; ~800 species). Corymbia is grown for timber, pulp and paper, and essential oils in Australia, South Africa, Asia, and Brazil, maintaining a high-growth rate under marginal conditions due to drought, poor-quality soil, and biotic stresses. To dissect the genetic basis of these desirable traits, we sequenced and assembled the 408 Mb genome of Corymbia citriodora, anchored into eleven chromosomes. Comparative analysis with Eucalyptus grandis reveals high synteny, although the two diverged approximately 60 million years ago and have different genome sizes (408 vs 641 Mb), with few large intra-chromosomal rearrangements. C. citriodora shares an ancient whole-genome duplication event with E. grandis but has undergone tandem gene family expansions related to terpene biosynthesis, innate pathogen resistance, and leaf wax formation, enabling their successful adaptation to biotic/abiotic stresses and arid conditions of the Australian continent.

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