Physiological effects of gibberellic acid. V. Endosperm responses of barley, wheat, & oats

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Abstract
The gibberellic acid-induced responses of 23 barley, 1 wheat and 1 oat variety were investigated. All varieties examined responded to gibberellic acid. Correlation coefficients obtained from the sugar release, dry weight loss and protein N release data derived from the 23 barley varieties indicate that the responses are very closely related and are probably initiated as a whole rather than as separate, unconnected events. The values for wheat are very compatible with the barley regressions and it appears that the response-syndrome of wheat is identical to that of barley. The germination index of the barley varieties was determined in the presence and absence of gibberellic acid. There was no significant difference between the treated and non-treated series indicating that the initial point of effect of gibberellic acid is the endosperm, where it brings about the mobilization of endospermal reserves. The data strongly support the postulate that an endogenous gibberellin is the endosperm mobilizing hormone in cereals.