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Calonectria pentaseptata Causes Severe Leaf Disease of Cultivated Eucalyptus on the Leizhou Peninsula of Southern China
Plant disease, 2020-02, Vol.104 (2), p.493-509
[Peer Reviewed Journal]
ISSN: 0191-2917 ;EISSN: 1943-7692 ;DOI: 10.1094/PDIS-05-19-1009-RE ;PMID: 31790643
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Title:
Calonectria pentaseptata Causes Severe Leaf Disease of Cultivated Eucalyptus on the Leizhou Peninsula of Southern China
Author:
Wang, QuanChao
;
Chen, ShuaiFei
Subjects:
China
;
Eucalyptus
;
Hypocreales
;
Plant Diseases
;
South America
Is Part Of:
Plant disease, 2020-02, Vol.104 (2), p.493-509
Description:
(Myrtaceae, Myrtales) trees are widely cultivated for commercial purposes worldwide. Calonectria leaf blight is one of the most prominent diseases associated with trees grown in plantations in Asia and South America. Recently, symptoms of leaf blight, shoot blight, tree death, and seedling rot caused by species have been observed in commercial plantations and nurseries in Leizhou Peninsula, which is one of the most densely -planted areas in southern China. Disease samples were collected from 10 species and a number of , , and hybrid genotypes that were planted on plantations at 13 sites and one experimental nursery. A total of 773 isolates of were obtained from 683 plantation trees and nursery seedlings. Fifty-five representative isolates from all the surveyed sites and species/genotypes were selected for molecular identification. These 55 isolates were identified by DNA sequence analyses based on the calmodulin ( ), histone H3 ( ), translation elongation factor 1-alpha ( ), and β-tubulin ( ) gene regions, as well as a combination of morphological characteristics. The results indicated that these 55 isolates present one single species, . Determined by sequences of , , , and gene regions, only two genotypes were identified among the 55 representative isolates; 54 of these isolates share the same genotype, suggesting that the genetic diversity of collected during this study was relatively low. A growth study indicated that is a high-temperature species. The mating test results suggested that is heterothallic or lacks the ability to recombine to produce fertile progeny. Inoculation results showed that causes leaf blight and stem rot, resulting in tree death of the two widely planted genotypes in southern China, and that the two genotypes differ significantly in their susceptibility to infection by . A selection program to develop planting stocks with high levels of resistance to Calonectria leaf blight in China during the long-term should be urgently initiated.[Formula: see text] Copyright © 2020 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
Publisher:
United States
Language:
English
Identifier:
ISSN: 0191-2917
EISSN: 1943-7692
DOI: 10.1094/PDIS-05-19-1009-RE
PMID: 31790643
Source:
MEDLINE
Alma/SFX Local Collection
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