Studies in the Physiology of the Onion Plant

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Abstract
At temperatures above about 17° C. inflorescence initiation in growing onion plants, as in stored sets, is suppressed whether the plants are kept in long or short days. Independently of current day-length and of previous day-length treatment, if the plants are sufficiently large initiation begins very shortly after the temperature falls below c . 15° C. Emerged infiorescences appear some ten or so weeks later. Small plants are unable to initiate inflores cences under any of the conditions tested, and actual size (perhaps leaf area) rather than leaf or node number seems to be the important factor. Inflorescence emergence is suppressed at high temperatures in short days or long days; in long days bulb formation also suppresses emergence at lower temperatures. In long days at temperatures sufficiently low for bulbing to be delayed, however, emergence is accelerated. Plants which have produced bulbs in long days in the summer show a delay of inflorescence emergence in the following winter.

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