Abstract
Flower opening depends on light–dark periods in diurnal plants, while this role of light in nocturnal plants is elusive. To elucidate this, an experiment with sprays of Oenothera glazioviana was carried out. Sprays were divided into 3 sets. First set of sprays was kept in the laboratory with alternate light and dark period (Control), second set of sprays was kept under continuous light and third set of sprays was kept under continuous darkness held in distilled water or sucrose (0.025 M) along with CoCl2 (0.01 mM). Flowers opened normally in all treatments but the sprays kept under continuous darkness showed maximum flower longevity, floral diameter, % blooms, soluble proteins and sugar fractions as compared to control which instead maintained an increased membrane stability index besides a decrease in lipid peroxidation. The sprays under continuous light showed increased α-amino acid and total phenolic content. The addition of sucrose augmented flower opening even under continuous light or darkness suggesting that light is not an obligatory requirement for flower opening in Oenothera glazioviana.
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