Lecture09 - MCDB321 Plant Physiology Feb. 08, 2011...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
MCDB321 Plant Physiology Feb. 08, 2011 Photosynthesis III Physiological and ecological consideration 1. How does leaf anatomy or movement of chloroplasts and leaves control the light absorption? A. leaf anatomy affects light absorption B. chloroplast movement controls light perception C. solar tracking system 2. How do chloroplasts/leaves adapt to their light environment? anatomical/biochemical adaptation canopy/sunfleck 3. How does the leaf photosynthesis rate respond to light, temperature, [CO 2 ]?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Leaf Anatomy Maximizes Light Absorption Epidermis: transparent, focusing Palisade cells: sieve effect (chloroplasts), light channeling Spongy mesophylls: light scattering (increase light absorption)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Special leaf anatomic features to reduce light absorption Leaf hairs, salt glands, epicuticular wax
Background image of page 4
Solar-tracking mechanism allows leaves to keep a perpendicular position to the incident light Heliotropism paraheliotropic vs. diaheliotropic
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Pulvinus-actuated leaf movements. Pulvini are swollen parts at the base of leaf stalks or petioles which move leaves Anatomically all pulvini consist of thick-walled water-conducting vascular tissue surrounded by thin-walled motor cells which can undergo visible swelling and shrinking.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chloroplast movement controls light absorption 1. Under low light, chloroplasts gather at the cell surfaces
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 23

Lecture09 - MCDB321 Plant Physiology Feb. 08, 2011...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online