F&V Intro Flashcards
what is the respiration quotient (RQ)
volume of CO2 produced over O2 consumed
RQ value for complete oxidation of glucose
1
what does low RQ suggest
fat metabolism
what does a high RQ suggest
organic acids
when does RQ increase the most
climacteric stage of ripening
two types of respiratory patterns
climacteric
non-climacteric
describe climacteric respiratory behavior
rise in respiratory rate
how is climateric ripening intiated
ethylene threshold conc reached
describe non-climacteric ripening
no rise in repsiration
describe the relationship between ethylene con and ripening for non-climacteric fruit
ripening increases with increased ethylene, it will decrease if ethylene is removed
what can stress in non-climateric fruit do
result in phenol production = bitterness
burst of respiration but may not lead to ripening
what can stress in non-climacteric fruit do
result in phenol production = bitterness
a burst of respiration but may not lead to ripening
what is transpiration
movement of water from the soil to the atmosphere from plants
3 steps to transpiration
water absorption from roots
water travels up xylem tubes
water is lost through stomata from leaf surface
what do sotmata play an important role in?
facilitating gas exchange
controlling water loss
regulation/responding to environment
