Lec7FactorsAffectingPhotosynthesis

Sunflower factors affecting photosynthesis

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Unformatted text preview: Leaf orientation • Solar tracking of leaves (heliotropism) – Under control of pulvinus http://www.environment.gov.au/ • Specialized organ at junction between the leaf blade and the petiole Solar tracking of the sun and this is controlled by pulvinus, and this is near the junction between the leaf blade and the petiole. – Sunflower Factors Affecting Photosynthesis Chloroplast Rearrangement Text • Orientation (under the control of microfilaments) to control light absorption – Change to either increase absorption of light in low-light conditions or decrease absorption in high-light conditions Factors Affecting Photosynthesis Carbohydrate Translocation • An internal control mechanism • Removal of developing tubers, seeds, and fruits (strong sinks) inhibits photosynthesis after a few days these are sinks, where sugar get transported to. – Source-sink interactions the place that sugars go they are called sinks http://pubs.caes.uga.edu/caespubs/ Factors Affecting Photosynthesis Carbohydrate Translocation • Sugars not moved out of mesophyll cells can inhibit photosynthesis – ‘Feedback inhibition’ • Buildup of end product of a metabolic process reduces metabolic production of that product • As more sugars are needed by the plant, it can increa...
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