By Jeng-Sheng Huang
Each plant-pathogen interplay includes a two-way molecular verbal exchange. On one hand, the pathogen perceives indications from the plant, secretes chemical arsenals to set up an infection courts, and produces metabolites that disrupt structural integrity, adjust mobile functionality, and avoid host defenses. nonetheless, the plant senses the signs from the pathogen, reinforces its cellphone partitions, and accumulates phytoalexins and pathogenesis-related proteins in an try and shield itself. The creation of pathogenicity and virulence elements by way of the pathogen, the elicitation of safeguard mechanisms through the plant, and the dynamic interplay of the 2 are the focal issues of this booklet. The booklet should be of curiosity to researchers and complex undergraduate and graduate scholars within the parts of plant pathology, plant body structure, and plant biochemistry.
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Each one plant-pathogen interplay includes a two-way molecular communique. On one hand, the pathogen perceives indications from the plant, secretes chemical arsenals to set up an infection courts, and produces metabolites that disrupt structural integrity, adjust mobile functionality, and avoid host defenses.
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Extra resources for Plant Pathogenesis and Resistance: Biochemistry and Physiology of Plant-Microbe Interactions
Mechanical force has been proposed as a mechanism of penetration. The molecular biology of appressorium development and penetration process is not fully understood. A pathogenicity gene, MPG 1, highly expressed during appressorium formation has been identified in Magnaporthe grisea. The gene encodes a 15-kD hydrophobin that interacts with hydrophobic rice surface and acts as a developmental sensor for appressorium formation. The MPGI- mutant has reduced ability to form appressoria and produces a smaller number oflesions and are therefore less pathogenic than the wild type.
The mutant possesses an 80-90% reduction in cutinase activity when grown for 3-5 days on acetate- or cutin-containing medium. Induction of cutinase by cutin or cutin hydrolysate after growth on glucose medium is similarly reduced. Kinetic analysis indicates that cutinase from the mutant possesses a near normal Km for PNB and a 92% reduction in v,nax. Fluorography and Western blotting ofSDS-PAGE of separated 35S-labeled proteins from cutin induction medium reveal that the mutant's 22-kD band corresponding to cutinase is reduced by approximately 85%.
IG, Clough RC, Barnum SR (1989) A cerulenin insensitive short chain 3-ketoacyl-acyl carrier protein synthase in Spinacia o/eracea leaves. leffree CE (1996) Structure and ontogeny of plant cuticles. In: Kerstiens G (ed) Plant cuticles: an integrated functional approach. ) Moench. lones A, Maelor H, Voelker TA (1995) Palmitoyl-acyl carrier protein (ACP) thioesterase and the evolutionary origin of plant acyl-ACP thioesterases. Teffree CE (1983) Plant Surfaces. Edward Arnold, London. 93 pp Kamper JT, Kamper U, Rogers LM, Kolattukudy PE (1994) Identification of regulatory elements in the cutinase promoter from Fusarium so/ani f.