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Effect of -naphthaleneacetic acid on dichotomous branching of isolated roots of Pinus silvestris



Effect of -naphthaleneacetic acid on dichotomous branching of isolated roots of Pinus silvestris



Physiol Plantarum 3(1): 40-44



Cultures of isolated roots from 5-months-old pine roots were treated with various concns. of alpha-naphthaleneacetic acid. The author had shown in previous publications that dichotomous branching in such isolated roots is produced by exudates of mycorrhizal fungi and that this effect of such exudates can be essentially reproduced by low concns. of indoleacetic acid. In the present paper the effect of alpha-naphthaleneacetic acid was investigated. The most effective range of this substance for dichotomous branching was at concns. between 0.5 and 2.5 [mu]g./ml. Effects other than dichotomy are discussed briefly.

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