Flowering in Pisum: Kinetics of the Vernalization Response in Genotype If e Sn Hr

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Abstract
Previous work has shown that vernalization acts at two sites, one in the cotyledons and one in the shoot, in young plants of genotype Ife Sn Hr. During the present study the size of the vernalization responses in both the cotyledons and shoot increased as the temperature was lowered from 17 to 3 °C. This occurred regardless of whether the treatment was given for the same chronological period of time or for the same physiological period of time. Vernalization treatment was effective from the time the seeds were developing in the pods on the maternal plant until at least 20 leaves were expanded and became gradually more effective as the length of the treatment was increased from 2 to 5 weeks. High pre– or post–vernalization temperatures can reduce the cotyledon effect and to a lesser extent the shoot effect of vernalization. Devernalization occurred to a larger extent in low light intensities and darkness than in high light intensities. No stabilization of the vernalization effects in the cotyledons or shoot appeared to occur at normal growing temperatures (15–25 °C). These results are discussed in terms of the previously hypothesized mechanisms for the cotyledon and shoot effects of vernalization.

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