Some Effects of Photoperiod on Barley

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Abstract
Fourteen barley varieties originating in areas of differing latitude were grown in controlled-environment rooms. Three treatments were given viz. 12, 15, and 18 hours light per day, and measurements were made of time to flowering and leaf development. An analysis of the rate of leaf appearance and leaf size was made by the methods described. The effect of lengthening photoperiod was to hasten flowering, reduce the leaf number before flowering, increase the rate of leaf emergence, and change the pattern of leaf size up the stem, though varieties differed in the magnitude of their response. The correlated changes found appear to conform to an hypothesis of internal competition for nutrients within the plant. Differences between these results and those of other workers are discussed in the light of this hypothesis.

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