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The Action of Ethylene on Plant Growth

H. David Michener
American Journal of Botany
Vol. 25, No. 9 (Nov., 1938), pp. 711-720
Stable URL: http://www.jstor.org/stable/2436929
Page Count: 10
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The Action of Ethylene on Plant Growth
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Abstract

Ethylene decreases longitudinal growth in intact oat and pea seedlings. It does not, however, influence production or transport of auxin. In the pea seedlings it is possible that it significantly influences destruction of auxin in the intact plant. Ethylene also increases the sensitivity of these plants to auxin. It probably does so by causing an accumulation or activation of the "food factor" described by Went. Ethylene does not resemble auxin in its action on stem elongation. It is difficult to explain the known facts on the basis of a direct effect of ethylene on elongation. The manner in which ethylene decreases stem elongation thus still remains in doubt, but it is not due to any effect of ethylene directly on auxin or on the action of auxin on the plant. Also it is probably not due to a direct effect of ethylene on elongation. Ethylene produces stem enlargements in pea and oat seedlings which closely resemble those produced by auxin in high concentration. The formation of these swellings depends on the presence of roots. Auxin in high concentration and ethylene appear to act in the same way in the formation of these stem enlargements; but ethylene cannot induce swelling formation unless auxin is present in low concentration.

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