L4 - Growing quality

Question 1

Time of harvest -> initiation of ripening

when you harvest earlier the ripening starts earlier for apples for example (respiration increases after harvest)

Answer 1

No ripening on tree : avocado, pear, mango, apple, orchids, carnation

Question 2

With a little bit of waterstress vitamin C …..

Answer 2

increases (sweetness)

Question 3

Light intesity and amount

Answer 3

• Increase in photosynthesis and carbohydrates
• damage to PSII and photo inhibition.
• Excessive energy cannot be cancelled

Question 4

Surplus of energy-adaptation and defence

Answer 4

• elevating concentration of phytonutrients (carotenoids,tocopherols)
• icrease of ROS quenching
• increase of leaf nitrate levels

Question 5

Effects of light on quality

Answer 5

increased levels of antioxidants and phenolics can lead to increased shelf life and other quality improvements

Question 6

-4 main photoreceptors

Answer 6

• phytochromes
• cryptochromes
• UV-A receptors
• UV-B receptors