18 Questions
What is the primary effect of ethylene on seed germination?
Stimulation of germination
What is the effect of ethylene on the color of snap beans?
Loss of green color
What is the role of ethylene in the ripening of fruits?
Stimulates fruit ripening
What is the effect of ethylene on the flavor of carrots and parsnip?
Develops bitter flavor
What is the effect of ethylene on the stems of certain vegetables?
Stimulates thickening of stems
What is the effect of ethylene on the growth of adventitious roots on the stems of certain vegetables?
Promotes adventitious root growth
What is the primary effect of reducing temperature on climacteric fruits?
Delay in the onset of ripening
How does cooling affect the starch-sugar balance in certain vegetables?
It alters the starch-sugar balance
What is the benefit of rapid pre-cooling of produce?
Helps maintain desired storage temperature
Why is cooling below 10°C not beneficial for produce sensitive to chilling injuries?
It causes cellular damage
What is the effect of lowering temperature on ethylene production in produce?
Decreases ethylene production
What is the primary goal of harvesting produce in the morning when the temperature is low?
To minimize temperature fluctuations
What is the primary mechanism by which 1-MCP inhibitors control the detrimental effects of ethylene in fruit tissues?
By blocking ethylene receptor sites through binding
What is the effect of temperature on the rate of enzymic reactions involved in respiration in fruits and vegetables?
The rate of reaction approximates doubles for each 10°C rise in temperature
What is the role of potassium permanganate in controlling the detrimental effects of ethylene?
It absorbs ethylene gas through oxidation
What is the purpose of using ethylene filters/screens and sachets in fruit storage?
To absorb ethylene gas and reduce its detrimental effects
What is the formula used to calculate the Q10 value or unknown rate for any temperature difference in enzymic reactions involved in respiration?
Q10 = (R1/R2)10(t2 –t1) = constant
What is the relationship between Q10 and the physiological temperature range?
Q10 does not remain constant over the physiological temperature range
Learn about the methods of inhibiting ethylene, including the use of silver nitrate, cobalt ion, AVG, and 1-MCP. Understand how these inhibitors work by blocking ethylene receptor sites and inhibiting ethylene synthesis pathways.
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