EEB340H1 Lecture 8: EEB340 Lecture 8.docx

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Co2 and leaf evolution in late carboniferous leaf: lateral organ initiated at the shoot apical meristem: determinant in growth (stop growth at certain point, have tissue systems (parenchymatous growth) Microphyll: develop on plants that have a protostele: one main vein (are always exceptions maybe two veins) found in lycophyta. Megaphyll: associated with all other stellar configurations: complex vascular system, evolution commonly described by telome theory in the fossil record, see microphylls in the devonian (early, see megaphylls in the late devonian (later) Enation theory: lateral perturbance from shoot apical meristem vascular tissue grows through and into protrusion microphyll: microphyll isn"t necessarily small. In carboniferous there were huge drops in co2. Mutation that increased stomatal density selected for because decreased co2 density increased to 1000 mm-2: megaphyll will capture much more (200% more) solar energy as a planar structure than will a radial structure.

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