Showing papers in "Physiological and Molecular Plant Pathology in 1996"

TL;DR: Some biological roles for isoflavonoid molecules produced in legumes in response to mutualistic symbioses with consideration of the anti-microbial definition of phytoalexins are summarized.

TL;DR: The sufficiency of a hydrophobic surface to induce appressorium formation in vitro for a collection of M. grisea isolates is reported and a working model of infection related morphogenesis of the plant surface is presented.

TL;DR: Ozone treatments can be considered as a possible substitute for SO2fumigation for the control of post-harvest fungal decay in grapes following cold storage and increased shelf-life.

TL;DR: Changes in the activity of enzymes which either utilize H 2 O 2 or are involved in generating or removing active oxygen species were investigated and an in situ peroxidase activity stain correlated with lignification in inoculated tissues.

TL;DR: The first molecular evidence to indicate that members of the diverse nivale variety may form a single group is shown, using competitive PCR, to determine the level of colonisation of wheat seedlings by isolates of each variety.

TL;DR: The results suggest that cutinase plays an important role in the pathogenicity of E. graminisand and may affect germination as well as cuticular penetration.

TL;DR: Reduced rates of primary penetration in barley grown in 700ppm CO 2 is related to higher rates of net photosynthesis allowing increased mobilisation of resources into resistance including the production of papillae and accumulation of silicon at the sites of appressorial penetration.

TL;DR: Based on arbitrarily primed PCR (ap-PCR), intraspecies similarity among the isolates of C. acutatum and C. gloeosporioides ranged from 78 to 93% and from 0 to 38%, respectively.

TL;DR: Although the cutin monomers tested did not induce a number of defence-related barley genes, protection was eliminated by inhibiting host transcription with cordycepin, suggesting the involvement of inducible host reactions in the observed protection, and is compatible with a model that includes cut in monomers as signal molecules for the induction of disease resistance in barley.

TL;DR: It is suggested that a higher constitutive level of chitinase and β-1,3-glucanase and the induction pattern of a 30kDa chit inase isozyme in early blight resistant breeding lines is related to genetically-inherited resistance of tomato to A. solani.

TL;DR: In this paper, an acidic β-1,3-glucanase and three isoforms of chitinase (A, B, C) were isolated and purified from cucumber leaves inoculated with a necrogenic fungus, Colletotrichum lagenarium.

TL;DR: It is postulated that the diferulic acid formation occurs in oat cell walls at the infection sites in incompatible interactions and may contribure to locally induced resistance in oats by providing a barrier to pathogen ingress.

TL;DR: It is suggested that early flavonoid accumulation is associated with the hypersensitive reaction of cotton cotyledons toX.

TL;DR: Honey, the causal agent of brown rot of stone fruit, has melanin associated with the cell walls of the conidia and in the outer rind of its stroma (fruit mummy), and melanin functions to provide theConidia with resistance to a variety of environmental stresses.

TL;DR: Fungitoxicity assays demonstrated that the 5-methoxyluteolinidin is a phytoalexin as it prevented germination by, and killed conidia ofColletotrichum sublineolum, the sorghum anthracnose pathogen, at a concentration of 3μ M .

TL;DR: It is shown that a final stage of resistance expression involves the accumulation of a pigment in uninfected, healthy epidermal cells that surround restricted lesions on leaves of the resistant cultivar.

TL;DR: Cell-free culture filtrates of the fungal plant pathogen Rhizoctonia solaniisolate 2B-12 inhibited the growth of the biocontrol agents Bacillus megateriumstrain B153-2-2 and Trichoderma harzianumisolate Th008, and reported on the activity of several extracellular enzymes which has not been previously reported for either R. solanior or T. harZianum.

TL;DR: It is concluded that the WV type can coinfect and coexist with the HV type within a single lesion in leaves and inoculation of the Wv type can induce systemic acquired resistance (SAR) in oilseed rape to the Hv type, the first report of SAR in oil Seed Rape.

TL;DR: Germ tubes of both virulent and avirulent isolates of Leptosphaeria maculanspenetrate leaves of Brassica junceacultivar Stoke through stomatal pores suggest that B. junceacan express resistance responses in the mesophyll layer in addition to those of the stomata.

TL;DR: Tissue-specific expression of genes encoding these hydrolytic enzymes as studied by means of situhybridization is reported on, finding that the induction, observed most abundantly in resistant genotypes, correlates well with the difference in gene expression previously observed in time course experiments of compatible and incompatibleC.

TL;DR: The results suggest that the β-1,3-glucanase isoform N is important for resistance of tobacco plants against the fungi tested but not against viruses.

TL;DR: Observations on germ tube development indicated that orientated growth of the germ tubes towards stomata was not aected, but appressoria did not dierentiate over the guard cells, and mass spectrometry indicated that the presence of an extensive wax covering over theStomata of the avoidance lines did not result in increased water use eciency.

TL;DR: Four phytoalexins were identified from inoculated stems of cocoa genotypes resistant toVerticillium dahliae and the least polar was unambiguously identified as the most stable form of elemental sulphur, cyclo-octasulphur S8, by GC-MS and X-ray crystallography.

TL;DR: Alanine, asparagine, glutamine, malate, serine, and threonine in soybean root and seed exudates may serve as chemoattractants to B153-2-2 cells, which may contribute to its successful colonization of soybean roots and seeds.

TL;DR: A modified version of the Pfeffer technique has been developed to demonstrate a strong chemotactic response of hormogonia from the filamentous nitrogen fixing cyanobacterium Nostoc sp.

TL;DR: Data indicate that an early and rapid PGIP mRNA accumulation is associated with the hypersensitive response in beanC.

TL;DR: The application of a cell-free extract from a broth culture of Pseudomonas fuscovaginae to rice plants produced leaf sheath necrosis and inhibited panicle emergence typical of bacterial sheath rot and was also fungistatic to Geotrichum candidum and displayed amphipathic properties.

TL;DR: Oligonucleotide primers made complementary to conserved sequences in phenylalanine ammonia-lyase (PAL) and chalcone synthase (CHS) genes previously cloned from other species were used to amplify segments of the corresponding genes from sorghum to create clones derived from the coding regions of PAL and CHS.

TL;DR: Compared with non-transformed plants, the transgenic lines which synthesized PL3 were more resistant to tissue maceration by E. carotovora or its enzymes and the possible implications of PLs and their enzymatic products for protection against invading microbes are discussed.

TL;DR: Of the assays tested, indirect immunofluorescence appears to be the most rapid and amenable assay for the detection in soil of low levels of resting spores of P. brassicae in soil.