Photosynthesis: Physiological and Ecological Considerations

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9.5.3 Patterns of light absorption generate gradientsof CO 2 fixation39FIGURE 9.21Distribution ofabsorbed light inspinach sun leaves.40Tidestromia oblonfifolia (Honeysweet)Larrea divaricata (Creosote bush)10 15FIGURE 9.22 Changes in photosynthesis as a function of intercellular CO 2concentrations.20
411 Pa = 1 Newton per meter 2 (N m 2 )= 1 kg m s 2 m 2 42C 3 plants versus C 4 plants1. (a) In C 4 plants, photosynthetic rates saturate at c ivalues of about 15 Pa, reflecting the effective CO 2 -concentrating mechanisms operating in these plants.(b) In C 3 plants, increasing c i levels continue tostimulate photosynthesis over a much broader CO 2 .2. (a) In C 4 plants, the CO 2 compensation is zero ornearly zero, reflecting their very low levels ofphotorespiration.(b) In C 3 plants, the CO 2 compensation point is about10 Pa, reflecting CO 2 production because ofphotorespiration.21
Page 1 and 2: 1Lincoln Taiz and Eduardo ZeigerPla
Page 3 and 4: 56•Light can be measured as energ
Page 5 and 6: 9.2.1 Light anatomy maximizes light
Page 7 and 8: 9.2.3 Leaf angle and leaf movement
Page 9 and 10: 17(triangle orache)(wild ginger)Das
Page 11 and 12: 21(triangle orache)FIGURE 9.10 Ligh
Page 13 and 14: THE XANTHOPHYLL CYCLE25An epoxide i
Page 15 and 16: •Two types of photoinhibition29FI
Page 17 and 18: 33Scientific Name: Tidestromia oblo
Page 19: THE GREENHOUSE EFFECT37FIGURE 9.19
Page 23 and 24: 45CO 2 assimilationH 2 O evaporatio

Photosynthesis: Physiological and Ecological Considerations

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