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Abstract
The effect of kinetin applied to barley plants (Hordeum distichon L. cv. Pallas) via their roots on the number of primordial spikelets on the shoot apex and its development both in long (16h) and short (10h) photoperiods has been studied. Kinetin has no statistically significant effect on the number of primordial spikelets on the main stem when applied under long photoperiod conditions although it does resuIt in a slight increase in the short photoperiod. As far the development of the main stem itself, all the concentrations assayed enhanced its growth, although only 10-5 M in worked out to be statistically significant.
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