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auxin

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auxin
plant hormone.
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It has been known since the 1930s that the plant hormone auxin is released by the plant's actively growing tip and is transported down the main stem where it has an indirect effect on buds to inhibit branching.
Why pruning encourages plants to thrive by Asian News International
Whether you are planting vegetable seedlings, bare-root roses or fruit trees, transplanting established garden specimens from one location to another, or propagating plants by stem cuttings or division, auxin will accelerate development of new roots.
GARDENING Use root-booster to promote a flood of cherry tomatoes by Daily News (Los Angeles, CA)
It does this because light coming from the window side of the plant destroys the auxin in the shoots and leaves on that side, so that growth on this side slows down.
Why Plants Bend Towards Light by peterhutch / Environmental issues community
 
 
 
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