Meisterprüfung Gärtner Practice Questions - Österreichische Meisterprüfung Für Das Reglementierte Handwerk Der Gärtner (Master Craftsman In Horticulture & Gardening) Exam

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In the photoperiodic control of short-day ornamental crops such as Euphorbia pulcherrima and Chrysanthemum, which phytochrome state and light spectrum inhibit flower bud induction when applied during the night period?

Conversion of the active Pfr form to the inactive Pr form by far-red light (~730 nm) during a night break Direct degradation of cryptochrome blue-light receptors by ultraviolet UV-A radiation Conversion of the inactive Pr form to the active Pfr form by red light (~660 nm) during a night break Stabilization of zeaxanthin pigments through green light (~520 nm) night interruption

Correct Answer:

Conversion of the inactive Pr form to the active Pfr form by red light (~660 nm) during a night break

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