Plant species

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host tissue host:ppathw3.cals.cornell.edu

Listing 1 - 10 from 12 for host tissue

Disease Cycle
... enlarged image. In most of the United States and Canada, Phytophthora infestans requires a living host to survive between seasons. Usually it lives in infected potato tubers (Fig. 2), which can ... dry conditions no sporulation occurs and the lesion has a brown dead center, surrounded by host tissue that has collapsed and appears either water soaked, gray-green, or yellowed (Fig. 6). Both ...
ppathw3.cals.cornell.edu

On-Line Glossary: S
... 2) somaclonal variation. Variability in clones generated from a single mother plant, leaf, etc. by tissue culture. (2) sooty mold. A fungus of the family Capnodiaceae and of certain other ... with delicate lines, grooves, or ridges. (7) stroma. A compact mass of vegetative tissue, sometimes intermixed with host tissue, often bearing sporocarps either within or upon its surface. (Pl. stromata.) (15) ...
ppathw3.cals.cornell.edu

Evan Johnson
... to plant pathology because of the complex interactions that occur between pathogen and host. Currently, I am studying multiple aspects of the interaction of scab causing Streptomyces ... their host plants. One project involves identifying the plant-derived compounds cause plant-pathogenic Streptomyces spp. to switch from a saprophytic soil-inhabiting lifestyle to pathogenic host tissue-inhabiting ...
ppathw3.cals.cornell.edu

On-Line Glossary: A
... (17) acervulus. A mass of closely clustered conidiophores and conidia not covered by fungal tissue, initially subcuticular or subepidermal but eventually exposed. (pl. acervuli) (15) acropetal. Describes the ... ) is not covered by fungal tissue at maturity. (Pl. apothecia.) (15) appressorium. An enlargement on a hypha or germ tube that attaches itself to the host before penetration takes place. ...
ppathw3.cals.cornell.edu

On-Line Glossary: C
... Basidiomycotina). (15) clavate. Club-shaped. (14) cleistothecium. An ascocarp with the asci surrounded by fungal tissue and without regularly formed openings. (Pl. cleistothecia.) (15) cloaca. In nematodes: A common duct or ... to replenish the soil, curb pests, etc. (1) cross-protection. The protection conferred on a host by infection with one strain of a virus that prevents infection by a closely- ...
ppathw3.cals.cornell.edu

On-Line Glossary: D
... . Progressive death of shoots, branches and roots generally starting at the tip. (2) differential host. A plant host that on the basis of disease symptoms serves to distinguish between various strains or ... for infection. (21) disinfectant. A physical or chemical agent that frees a plant, organ, or tissue from infection. (2) disinfest. To kill pathogens that have not yet initiated disease, but that ...
ppathw3.cals.cornell.edu

On-Line Glossary: H
... it is smaller and located posterior to the hemizonid. (14) heteroecious. Requiring more than one host species to complete a life cycle (e.g., of Uredinales) (15) heterogamy. Plasmogamy between ... epiphytic mycelium of a black mildew fungus. (Pl. hyphopodia.) (21) hypodermis. In nematodes: A thin tissue layer beneath the cuticle that thickens to form the dorsal, lateral, and ventral chords, which ...
ppathw3.cals.cornell.edu

On-Line Glossary: I
... court. A site in or on a host plant where infection can occur. (5) infection thread. The specialized hypha of a pathogenic fungus that invades tissue of the susceptible plant. (20) infectious. Capable of producing propagules that disperse from one host to another and infect it. (3) infective. Of ...
ppathw3.cals.cornell.edu

On-Line Glossary: P
... (cyanobacteria) and mollicutes (phytoplasma and spiroplasma). The viruses from these different host groups are termed bacteriophages, cyanophages and mycoplasmaphages, respectively. (10) phasmid. In ... accompanying paraphyses or other threads, lie scattered irregularly in a pseudoparenchymatous tissue composed of the ascogenous hyphae. (17) pleomorphic. Exhibiting pleomorphism. (16) pleomorphism. 1 ...
ppathw3.cals.cornell.edu

On-Line Glossary: R
... as an absorptive organ. (16) rhizomorph. A macroscopic, typically rope-like strand of compacted tissue formed by certain higher fungi. Rhizomorphs often are enduring structures that can remain dormant ... similar to bacteria in most respects but generally capable of multiplying only inside living host cells; parasitic or symbiotic. (2) ringspot. A type of local lesion consisting of single ...
ppathw3.cals.cornell.edu