Best of Flashcards
1
Q
Please define fruit quality?
A
- Degree to which a set of inherent characteristics (texture, sugar content, pH…) fulfil requiremnts (cosumer satisfaction).
2
Q
What factors are affecting fruit quality?
A
- Microorganisms (fungi, moulds, yeast)
- Enzymes (pectinase-hot brake, PPO-cold brake)
- Insects, rodents
- Volatiles
- Light
- Temperature
- Atmosphere
- Water activity/moisture
3
Q
What is a Physiological post-harvest disorders?
A
Disorders of the regular metabolism:
- Ripening
- Respiration
- Carbohydrate metabolism
- Organic acids metabolism
- Translocation of cations
Factors: Developmental stage, Agronomical conditions, Nutritional supply, Agronomical conditions, Meteorological conditions, Pedoclimatic conditions, Storage conditions
4
Q
What is a disease?
A
- A plant disease is usually defined as abnormal growth and/or dysfunction of the plant.
- Diseases are the result of some biotic (fungi, bacteria, virsuses) or abiotic disturbance (salt stress, wind) in the normal life process of the
5
Q
Please explain the difference between climacteric and non climacteric fruits?
A
- related to presence or absence of respiration and ethylene biosyntheses increase, in correspondence of ripening beginning.
Climacteric Fruit (Peach, Apricot, Banana, Plum)
- increase in respiration in the ripening phase
- they require ethylene to ripen
- climacteric fruits produce higher amounts of ethylene than non-climacteric fruits during ripening
Non-climacteric fruits (strawberry, cherry, grapefruit)
- do not show a respiration rise during ripening
- perform most of the chemical-physical changes that characterize fruits during ripening in a slow and constant ripening process evolution.
6
Q
What are the ways of action of 1-MCP (1-Methylcyclopropen)
A
- Influences the ripening hormon ethylene by binding at the ethylene receptors of the cell membrane
- Inhibits the signalling by exogenous ethylene
- Inhibits the production of endogenous ethylene
