Relation of gibberellic acid induced growth of wheat triticum aestivum cultivar sonalika coleoptiles with iaa

Chattopadhyay, K.K.; Bhattacharyya, R.N.; Basu, P.S.

Biochemie und Physiologie der Pflanzen (BPP) 179(1-2): 123-128


Accession: 006294590

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GA3 was reduced to half when oxidation of endogenous IAA was prevented by pretreatment of the coleoptiles with EDTA or a mixture of chlorogenic acid and 2,2'-dipyridyl. The effect of GA was reduced to 1/4 when the endogenous methyleneoxindole (MeOx), an oxidation product of IAA, was made unavailable to GA3 during its action. External application of hydroxymethyloxindole (HMO), earliest oxidation product of IAA, helped GA to regain its full activity even when oxidation of endogenous IAA was inhibited. Endogenous IAA, more precisely, its oxidation products, were apparently necessary for GA in exhibiting its growth promoting activity on wheat coleoptile sections.