HCS 2202 Unit 13

Light quantity

affects photosynthesis, causes stress if too much or too little

light compensation point

level of light where photosynthesis equals rate of respiration

Effects On Total Light Available

• clouds

• time of day

• time of year

• latitude

Leaf Area Index

ratio of one sided leaf area per unit of ground area

Max Crop Productivity

reliant on leaf area duration

Shade Avoidance Response - Excess Light

• photoinhibition

• degradation of photosynthetic apparatus

• heat stress

Shade Avoidance Response - Light Deficit

• yield reduction

• weakened defense

• plant starvation

Sun-Shade Acclimation is the Result Of Mods in

• leaf anatomy

• photosynthetic apparatus

• canopy architecture

Intercropping

producing 2+ crops on the same land at the same time

Photomorphogenesis

light induced changes in plant development and form, caused by photomorphogenic pigments

Pr

Absorbs red light, inactive form

Pfr

absorbs far red light, active form