English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Many  Calonectria  species are causal agents of diseases on several forestry, agricultural and horticultural crops.  Calonectria  leaf blight is one of the most important diseases associated with  Eucalyptus  plantations and nurseries in Asia and South America. Recently, symptoms of leaf rot and leaf blight caused by  Calonectria  species were observed in a one-year-old  Eucalyptus  experimental plantation in GuangXi Province, southern China. To better understand the species diversity, mating strategy and pathogenicity of  Calonectria  species isolated from diseased tissues and soils, diseased leaves and soils under the trees from ten  Eucalyptus urophylla  hybrid genotypes were collected. Three hundred and sixty-eight  Calonectria  isolates were obtained from diseased  Eucalyptus  leaves and soils under these trees, and 245 representative isolates were selected based on the sampling substrates and  Eucalyptus  genotypes and identified by DNA sequence analyses based on the translation elongation factor 1-alpha ( tef1 ), β-tubulin ( tub2 ), calmodulin ( cmdA ) and histone H3 ( his3 ) gene regions, as well as a combination of morphological characteristics. These isolates were identified as  Calonectria hongkongensis  (50.2%),  C. pseudoreteaudii  (47.4%),  C. aconidialis  (1.6%),  C. reteaudii  (0.4%) and  C. auriculiformis  (0.4%). This is the first report of  C. reteaudii  and  C. auriculiformis  occurrence in China.  Calonectria pseudoreteaudii  was isolated from both  Eucalyptus  diseased leaves and soils; the other four species were only obtained from soils.  MAT1-1-1  and  MAT1-2-1  gene amplification and mating type assignment results showed that  C. pseudoreteaudii  is heterothallic and an asexual cycle represents the primary reproductive mode,  C. reteaudii  and  C. auriculiformis  are likely to be heterothallic and  C. hongkongensis  and  C. aconidialis  are homothallic. Based on the genetic diversity comparisons for  C. pseudoreteaudii  isolates from diseased leaves and soils, we hypothesize that  C. pseudoreteaudii  in soils was spread from diseased leaves. Both the mycelia plug and conidia suspension inoculations indicated that all five  Calonectria  species were pathogenic to the two  Eucalyptus  genotypes tested and the tolerance of the two genotypes differed. It is necessary to understand the ecological niche and epidemiological characteristics of these  Calonectria  species and to select disease resistant  Eucalyptus  genotypes in southern China in the future.

journal of fungi

Species Diversity, Mating Strategy and Pathogenicity of Calonectria Species from Diseased Leaves and Soils in the Eucalyptus Plantation in Southern China