The diphenyl-ether herbicide acifluorfen is an inhibitor of protoporphyrinogen oxidase (PPO). PPO is a chloroplast enzyme that oxidizes protoporphyrinogen to produce protoporphyrix IX. This product is a precursor for both chlorophyll (photosynthesis) and haem (electron transfer). Chloroplast contents can be analysed by centrifuging chloroplast suspension in a layer above a layer of acid, separated by silicone oil - chloroplasts are forced through oil and burst in acid Chloroplast membranes are freely permeable to water and CO 2
In photosynthesis, carotenoids help capture light, but they also have an important role in getting rid of excess light energy. When a leaf is exposed to full sun, it receives Carotenoids in chloroplasts help absorb the excess energy and dissipate it as heat. What does it mean for a pigment to absorb light?
Killing Chloroplasts: Herbicides Targeting Photosynthesis By Angela K Hartstock National Centre for Case Study Teaching in Science Read through the following case study. Complete the tasks, written in red, as you come to them. Part I - Illuminating Photosynthesis Welcome to our plant sciences department here at TransBio!.