Can Calcium Sprays Induce Photoperiodic Sensitivity in Dark-Grown Pharbitis Nil?

Abstract

The ability to measure daylength has enabled plants, throughout their evolutionary history, to adaptively perform physiological functions appropriate to the time of year. Short-day plants, which respond to decreasing daylength in autumn, flower when the light period is shorter than a critical value, while long-day plants, which respond to increasing daylength in spring, flower when the light period is longer than a critical value. As a categorical example of those plants not belonging to either group, long-day/short-day plants flower only in response to a specific daylength sequence, perhaps occurring right before a rainy season, when seeds could germinate.