نتایج جستجو برای: leaf spotting pathogen

تعداد نتایج: 153226  

2017
Chang-Jie Jiang Xiao-Long Liu Xin-Qiong Liu Hui Zhang Ying-Jie Yu Zheng-Wei Liang

In response to pathogen attack, plants prioritize defense reactions generally at the expense of plant growth. In this work, we report that changes in phytohormone signaling pathways are associated with the stunted plant growth caused by blast disease in rice seedlings. Infection of rice seedlings with blast fungus Magnaporthe oryzae (race 007.0) at the four-leaf stage (three true leaves) result...

2012
P.W. Crous B.A. Summerell A.C. Alfenas J. Edwards I.G. Pascoe I.J. Porter J.Z. Groenewald

Four different genera of diaporthalean coelomycetous fungi associated with leaf spots of tree hosts are morphologically treated and phylogenetically compared based on the DNA sequence data of the large subunit nuclear ribosomal DNA gene (LSU) and the internal transcribed spacers and 5.8S rRNA gene of the nrDNA operon. These include two new Australian genera, namely Auratiopycnidiella, proposed ...

Journal: :Mycological research 2006
Pedro W Crous Hans-Josef Schroers Johannes Z Groenewald Uwe Braun Konstanze Schubert

Cladosporium musae, a widespread leaf-spotting hyphomycete on Musa spp., is genetically and morphologically distinct from Cladosporium s. str. (Davidiella anamorphs, Mycosphaerellaceae, Dothideales). DNA sequence data derived from the ITS and LSU gene regions of C. musae isolates show that this species is part of a large group of hyphomycetes in the Chaetothyriales with dematiaceous blastoconid...

Journal: :Phytopathology 2004
C M Cox K A Garrett R L Bowden A K Fritz S P Dendy W F Heer

ABSTRACT Because of differences in life histories between Puccinia triticina, a highly specialized, polycyclic, windborne pathogen with a shallow dispersal gradient, and Pyrenophora tritici-repentis, a residue-borne pathogen with a steep dispersal gradient, wheat mixtures are expected to be more effective at controlling leaf rust than tan spot. The objectives of this research were to determine ...

2014
Yong-Ju Huang Aiming Qi Graham J. King Bruce D. L. Fitt

Quantitative resistance against Leptosphaeria maculans in Brassica napus is difficult to assess in young plants due to the long period of symptomless growth of the pathogen from the appearance of leaf lesions to the appearance of canker symptoms on the stem. By using doubled haploid (DH) lines A30 (susceptible) and C119 (with quantitative resistance), quantitative resistance against L. maculans...

Journal: :The Plant cell 2005
Ryan W Shepherd W Troy Bass Robert L Houtz George J Wagner

In plants, defensive proteins secreted to leaf aerial surfaces have not previously been considered to be a strategy of pathogen resistance, and the general occurrence of leaf surface proteins is not generally recognized. We found that leaf water washes (LWW) of the experimental plant Nicotiana tabacum tobacco introduction (TI) 1068 contained highly hydrophobic, basic proteins that inhibited spo...

Journal: :journal of crop protection 2015
manpreet kaur neeraj kumar aggarwal

in the years 2012-14 a series of extensive surveys for natural enemies of parthenium were conducted in haryana. during survey, a leaf spot disease has been regularly reported on congress grass at different parts of the kurukshetra and its adjoining areas.the fungal pathogen was isolated from the affected parts of parthenium leaves and on the basis of cultural, morphological and molecular charac...

2007
K. E. Jayasuriya

Corynespora cassiicola was a devastating pathogen attributed to heavy leaf fall in susceptible clones of rubber (Hevea brasiliensis), in the mid-eighties in Sri Lanka. It is known to have a wide host range. This is the first report of C. cassiicola as a leaf pathogen of croton, Codiaeum veriegatum, an ornamental plant. This report emphasizes the possibility of C. cassiicola infecting new hosts ...

2017
Renata Ruiz Silva André Costa da Silva Roberto Antônio Rodella José Eduardo Serrão José Cola Zanuncio Edson Luiz Furtado

Rust is a major Eucalyptus spp. disease, which is especially damaging for early-stage plants. The aim of this study was to verify the pre-infection process of Austropuccinia psidii (A. psidii) in the leaves of three phenological stages of Eucalyptus clones with different resistance levels. Plants from the hybrids of Eucalyptus urophylla × Eucalyptus grandis (E. grandis) with variable levels of ...

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