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Phylogenetic Diversity and Effect of Temperature on Pathogenicity of .

07:00 EST 13th January 2020 | BioPortfolio

Summary of "Phylogenetic Diversity and Effect of Temperature on Pathogenicity of ."

Although lupin anthracnose caused by is a significant threat for spring and winter lupin crops, it has been poorly studied so far. This study aimed at characterizing the (i) phylogenetic, (ii) morphological, and (iii) physiological diversity of collected isolates from anthracnose-affected lupins. The genetic identification of representative isolates ( = 71) revealed that they were all species, further confirming that lupin anthracnose is caused by this species. However, multilocus sequencing on these isolates and 16 additional reference strains of revealed a separation into two distinct genetic groups, both of them characterized by a very low genetic diversity. The diversity of morphological characteristics of a selected subset of isolates was further evaluated. To the best of our knowledge, microsclerotia production observed for some isolates has never been reported so far within the species complex. Finally, the modeling of growth responses of a subset of strains revealed the capacity of some strains to grow in vitro at 5°C. This ability was also evidenced in planta, because DNA was detectable in plants from 14 days postinoculation at 5°C onward, whereas symptoms began to appear a week later, although at a very low level. Since lupin crops are planted during winter or early spring, growth studies in vitro and in planta demonstrated the capability of the species to grow at temperatures ranging from 5 to 30°C, with an optimum close to 25°C. In this study, specific primers were also designed for real-time quantitative PCR on fungal DNA and allowed the detection of in asymptomatic field samples. These results open perspectives to detect earlier and limit the development of this pathogen in lupin crops.

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This article was published in the following journal.

Name: Plant disease
ISSN: 0191-2917
Pages: PDIS02190273R0045

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