photomorphogenesis Flashcards
change in form or function of an organism occurring in response to changes in the light environment
photomorphogenesis
• there are also changes in morphology and/or cell structure and function
• it is a common feature of development in fungi, protists, and bacteria, as well as plants
photomorphogenesis
are blue-light receptors
(phototropism)
phototropins
controls a range of responses that serve to optimize the photosynthetic efficiency of plants such as phototropism, light-induced stomatal opening, and chloroplast movements in response to changes in light intensity.
phototropins
blue light receptor that mediates primarily blue -light that can affect hypocotyl elongation
(de-etiolation)
cryptochrome
dominant contributors to the sensing of light quality in plants, and also participate in the sensing of light presence, intensity and duration, and to a lesser extent light direction
red light
(photoperiodism)
Phytochrome
is a roughly 24 hour cycle in the physiological processed
endogenously generated
circadian rhythm
set the plant’s circadian rhythm (the 24hour activity cycle) using blue light receptors
Cryptochromes
regulation of physiology or development in response to day length.
photoperiodism
flowering hormone - is the hypothesized hormone-like molecule responsible for controlling and/or triggering flowering in plants.
florigen
produced in the leaves, and acts in the shoot apical meristem of buds and growing tips.
florigen
• It is known to be graft-transmissible, and even functions between species. However, despite having been sought since the 1930s, the exact nature of flowering hormone is still disputed.
florigen
radishes spinach and lettuce
long day
poinsettias, chrysanthemum, and asters
short day
roses, dandelions, tomatoes
day neutral
