What causes plants to rot? The Demise of a Pumpkin.

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Presentation transcript:

What causes plants to rot? The Demise of a Pumpkin

How long can pumpkins last? Healthy, Whole Pumpkins – 8 to 12 weeks Jack-O-Lanterns – 5 to 10 days Source: Steven Reiners, Cornell Univ.

Effect of Temperature Ideal temp. is °F Cold Temps. slow deterioration Warm temperatures speed up the deterioration process Freezing temperatures slow deterioration, but damage plant cells.

Dermal Tissue FUNCTION: The cuticle and epidermis offer protection and prevent loss of water DAMAGE: Exposes the pumpkin to bacteria and air The stomata can no longer regulate intake and loss of water

Vascular Tissue FUNCTION: Xylem cells circulate water through a system of tubes and transport cells DAMAGE: The water stored in the Xylem cells is released Example of Water Transport in a Tree

Dehydration of Plants Intact cells are rigid because they are full of water, and although the pumpkin is separated from the nourishing roots, the Xylem and Phloem can still nourish the pumpkin cells for an extended period of time When cells are deprived of water, or damaged, they shrink and become unable to support the plant and expose the pumpkin to damaging bacteria A lack of water speeds up oxidation

Oxidation When the surface of foods react with oxygen causing food to spoil. When oxygen is metabolized, it creates “free radicals” which steal electrons from other molecules, causing damage. An overload of “free radicals” causing tissue to break down. Antioxidants, found in certain foods such as pumpkins, help neutralize “free radicals”

What was our goal? Pumpkin Treatment Methods

Purpose of Treatment Methods Prevent dehydration through sealing the cut surfaces of hydrating them with liquid Inhibit mold growth by providing a barrier against mold or through application of an antifungal agent Slow down oxidation by creating a barrier against oxygen

Bleach and Water Daily spraying is intended to hydrate pumpkin flesh Bleach is antimicrobial What is bleach? A chemical known as Sodium Hypochlorite Pesticide/Fungicide Extremely Basic, pH 13

Pumpkin Fresh “Borax” Sprayed daily to maintain hydration of pumpkin flesh Fungicidal solution to slow rot What is Borax? Known as Sodium Tetraborate Natural Mineral Salt Used as an antiseptic Slightly Basic, pH 9.3

Vaseline Intended to keep the pumpkin flesh from dehydrating Used to create a barrier against mold and oxidation What is Vaseline? Petroleum Jelly; a leftover residue created during the refinery of crude oil

White Glue The dried glue is intended to seal the pumpkin, preventing dehydration What is white glue? A synthetic resin prepared by the polymerization of vinyl acetate Prepared from ethylene, a naturally occurring gas

Sources Better Health Channel Pictures waynesword.palomar.edu