The potential protein kinase A (Pka) phosphorylation site is required for the function of FgSge1 in Fusarium graminearum.

The new transcription factor Sge1 has garnered much attention in filamentous fungi recently, which highlights its role in pathogenicity, conidiation, and the production of secondary metabolites. In this study, we demonstrated that FgSge1 is localized in the nucleus in Fusarium graminearum using fluorescent protein GFP. Mutants containing a T67A mutation within the potential protein kinase A (Pka) phosphorylation site of FgSge1 exhibited a significant decrease in conidiation and dramatically impaired virulence on both wheat head and non-host tomato.

Genetic diversity of Ralstonia solanacearum strains from China assessed by PCR-based fingerprints to unravel host plant- and site-dependent distribution patterns.

Bacterial wilt caused by Ralstonia solanacearum is a serious threat to crop production in China. A collection of 319 R. solanacearum strains isolated from 14 different diseased host plants collected in 15 Chinese provinces was investigated by BOX fingerprints in order to test the influence of the site and the host plant on their genetic diversity.

Biological control of aflatoxin contamination of crops.

Aflatoxins produced primarily by two closely related fungi, Aspergillus flavus and Aspergillus parasiticus, are mutagenic and carcinogenic in animals and humans. Of many approaches investigated to manage aflatoxin contamination, biological control method has shown great promise. Numerous organisms, including bacteria, yeasts and nontoxigenic fungal strains of A.

Curtobacterium flaccumfaciens pv. beticola, A New Pathovar of Pathogens in Sugar Beet.

Bacterial leaf spot of sugar beet was first discovered in 1995 in Inner Mongolia of China. The pathogen was shown to be a bacterium with properties of gram-positive bacteria: small irregular rods, lateral flagella, aerobic, and catalase-positive. The colonies of sugar beet strains produced a pale-yellow pigment.

Repeat domain diversity of avrBs3-like genes in Ralstonia solanacearum strains and association with host preferences in the field.

Genes homologous to avrBs3 of Xanthomonas were detected in 309 strains of Ralstonia solanacearum biovars 3, 4, and 5 but not biovar 1 or 2. A statistically significant association between the originating plant species and internal repeats of the gene was found. Sequences of repeats and variation between nearly clonal strains revealed evidence of frequent recombination.

[RAPD analysis of plant pathogenic coryneform bacteria].

RAPD analysis was used for the taxonomy of plant pathogenic coryneform bacteria, especially for the classification of two new pathogens (Curtobacterium flaccumfaciens pv. basellae pv. nov.