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BIOL 1010 (75)
Lecture 75

BIOL 1010 Lecture 75: Lecture 75

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Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

Oc982 Bio 1010 The apical meristem at the tip of a shoot is s major site of auxin synthesis. As auxin moves downward, diffusing from cell-to-cell, it stimulates growth of the stem by making cells elongate. o As the blue curve in Figure 24.3b shows, auxin promotes cell elongation in stems only within a certain concentration range. Above a certain concentration (0.9g of auxin/litre of solution, in this case), it usually inhibits cell elongation in stems, probably inducing the production of ethylene, a hormone that generally counters the effects of auxin. o The red curve on the graph shows the effect of auxin on root growth. On the one hand, an auxin concentration too low to stimulate shoot cells will cause root cells to elongate. On the other hand, an auxin concentration high enough to make stem cells elongate is in the concentration range that inhibits root cell elongation. Higher concentrations benefit the plant by promoting stem growth while inhibiting root growth nearer to the sites of
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