Shokubutsugaku Zasshi
Online ISSN : 2185-3835
Print ISSN : 0006-808X
ISSN-L : 0006-808X
Varietal Difference in Photoperiodic Behavior of Pharbitis nil
Shun-ichiro IMAMURAMikio MURAMATSUShin Ichi KITAJOAtsushi TAKIMOTO
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1966 Volume 79 Issue 940-941 Pages 714-721

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Abstract

1)The photoperiodic sensitivity of Pharbitis nil can be evaluated by the minimum number of short day cycles and minimum duration of the dark period required for flower initiation, and by the readiness to initiate a terminal flower bud. The sensitivity of six strains tested stands in the following order: Tendan>Violet>Shifukurin>Nepal>Africa. Kidachi, a dwarf mutant, is an exception. It has the shortest critical dark period but seldom produces a terminal flower bud.
2) Grafting experiments indicated that the sensitive strain produces in leaves larger amounts of flowering hormone during a definite dark period, and is induced more easily to flowering in response to the same amount of floral stimulus than a less sensitive strain.

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© The Botanical Society of Japan
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