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Lecture

Plants Part 4 - Structures and Photosynthesis

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Department
Biology
Course
BIO 123
Professor
Jason Wiles
Semester
Spring

Description
Structures and Photosynthesis 01/15/2014 Adaptations for photosynthesis Most leaves have broad, flattened blade Efficient in collecting sun’s radiant energy Stomata open during day For gas exchange needed in photosynthesis Close at night to conserve water when photosynthesis is not occurring Except for in CAM plants (usually arid environments) then, the stomata open at night Transparent epidermis Allows light to penetrate into middle of leaf, where photosynthesis occurs Air spaces in mesophyll tissue Permit rapid diffusion of CO2 and water into (and oxygen out of) mesophyll cells Transpiration Loss of water vapor from aerial parts of plants Occurs primarily through stomata Rate of transpiration Affected by environmental factors Temperature Wind Relative humidity Effects of transpiration Both beneficial and harmful to plant Trade off between CO2 requirement for photosynthesis  Need for water conservation Loss of leaves can prevent water loss – True Leaf Abscission Loss of leaves As winter approaches in temperate climates At beginning of dry period in tropical climates with wet and dry seasons Complex process Physiological and anatomical changes occur prior to leaf fall Bud scales New growth comes from buds Meristematic tissues at tips During winter the scales protect from freezing Bulb Onion bulb is a bunch of leaves Some leaves are modifi
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