Molecular Plant Pathology Lecture 5

False (B)

Pectinases break down pectin, a component of the plant cell wall, which allows pathogens to penetrate and spread within plant tissues.

<p>Verticillium dahliae, Fusarium oxysporum</p> Signup and view all the answers

<p>Verticillium alboatrum = Pectin Fusarium oxysporum = Pectin N. haematococca = Pectin Cellulomonas = Cellulose</p> Signup and view all the answers

<p>Pectinases help pathogens penetrate and spread within plant tissues. (D)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Pectin acts as a glue-like substance that cements plant cells together, providing structural support and rigidity to the cell wall.</p> Signup and view all the answers

<p>All of the above (D)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>Cutinases degrade the cutin layer of plant surfaces, allowing pathogens to penetrate and infect the host.</p> Signup and view all the answers

<p>His</p> Signup and view all the answers

<p>Cellulases = Cellulose Hemicellulases = Hemicellulose Pectinases = Pectin Ligninases = Lignin</p> Signup and view all the answers

<p>Botrytis cinerea</p> Signup and view all the answers

<p>CWDEs are only produced by necrotrophic fungal pathogens. (E)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>Pectinases break down pectin, a major component of the plant cell wall, facilitating the degradation and softening of plant tissues.</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Pectin lyase (A)</p> Signup and view all the answers

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<p>Pectinases break down the pectin in plant cell walls, which helps to weaken the cell wall structure and allows pathogens to penetrate into the plant tissue.</p> Signup and view all the answers

<p>Pectin Lyase = Heavily methyl-esterified pectin Pectate Lyase = Pectate (homogalacturonan) Polygalacturonase = Pectin, pectinic acid, pectate Pectin methyl esterase = Pectin and pectinic acid, to form pectate</p> Signup and view all the answers

A disease in tomatoes that causes vascular discoloration.

An enzyme that helps fungi degrade cutin to penetrate plant surfaces.

The process where enzymes break down plant protective layers for infection.

Cutinases that help fungi adhere to plant surfaces during infection.

A stage in fungal infection where structures form to penetrate the host.

Enzymes that degrade plant cell walls for fungal growth.

Different types of enzymes that break down cellulose.

Enzymes that break down cellulose from the ends of chains.

The outermost layer of a plant cell made of cellulose and other polysaccharides.

The layer between plant cell walls that contains pectin and acts as a cementing substance.

Enzymes that break down components of the plant cell wall, aiding pathogens in invasion.

A group of polysaccharides in the cell wall, varying by plant species and including xyloglucans, xylans, and mannans.

A gel-forming polysaccharide found in the primary cell wall, mainly composed of D-galacturonic acid.

A type of pectin that forms a linear polymer, responsible for cell wall rigidity.

Pathogens affecting vascular systems in plants, often utilizing more pectinases to invade.

Enzymes that degrade pectin, facilitating parasite infection in plants.

An enzyme that breaks down pectin into smaller units.

An enzyme cleaving α-1,4-linkages in methylated pectin.

An enzyme that converts pectin into pectate by removing methyl groups.

An enzyme that breaks down pectate by cleaving α-(1-4) linkages.

An enzyme that hydrolyzes α-1,4-glycosidic bonds in pectin.

The breakdown of pectate resulting in plant disease symptoms.

A fungus causing symptoms in infected plants via pectate degrading enzymes.