Understanding Plant Flowering: Light, Darkness, and Cross-Pollination Dynamics

Jan 17, 2026

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This summary explores how flowering in plants is influenced by light exposure, highlighting the differences between long day plants, short day plants, and day-neutral plants. It discusses the critical role of dark exposure length in triggering flowering, with phytochrome pigments (Pfr and Pr) acting as timing mechanisms. The relationship between red light and sunlight is explained, as well as the slow conversion of Pfr to Pr in darkness. This knowledge is vital for enhancing cross-pollination through synchronized flowering.

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Understanding Plant Flowering: Light, Darkness, and Cross-Pollination Dynamics

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Notes • Flowering at same time for cross pollination. • Long day plants (flower when night is short) • Short day plants (flower when might is long) • Day Neutral plants have no light trigger.

If they reduced the timing by 1 hour they got flowering. • Can you tell from this if it’s the light or dark controlling the flowering? • No, not really

Notes • The flowering in plants is dependant on the length of the dark exposure. • The timing mechanism is phytochrome pigment – 2 types. Pfr (far red) Pr (red)