Related Experiment Video
Updated: Apr 25, 2026

Forced Flowering in Mandarin Trees under Phytotron Conditions
Published on: March 6, 2019
Climate sensitivity and variation in first flowering of 26 Narcissus cultivars
Anna Bock1, Tim H Sparks, Nicole Estrella
1Chair of Ecoclimatology, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, 85354, Freising, Germany, anna.bock@wzw.tum.de.
Abstract:
The first flowering dates of 26 Narcissus cultivars were recorded over a 27-year period on the island of Guernsey, within the English Channel. We analysed flowering trends over time and relationships with climate variables. The study revealed that earlier flowering cultivars advanced most and were more variable than later flowering Narcissus. We furthermore discovered a strong relationship between flowering and climate variables, with temperature appearing to be the main driver. Whilst the first flowering date averaged over all cultivars did show a significant advance, this was significant for only one of the individual cultivars. This is likely because temperatures from December to March had not significantly increased in Guernsey during the study period (1985 to 2011).
More Related Videos
Related Concept Videos
Responses to Heat and Cold Stress
Biological Clocks and Seasonal Responses
Frequency-dependent Selection
Factors Influencing Attraction VI: Personality Traits
Background and Environment Affect Phenotype
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
Morphogenesis

