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tropisms
plant growth responses to environmental cues; they are also known as tropic responses
auxins
plant hormones that act as powerful growth stimulants (eg. indoleacetic acid, IAA) and are involved in apical dominance, stem and root growth, and tropic responses to unilateral light
gibberellins
plant hormones that act as growth regulators, particularly in the internodes of stems, by stimulating elongation of the growing cells; they also promote the growth of fruit and are involved in breaking dormancy in seeds and in germination
red light
light with a wavelength of 620-700 nm, which is detected by plants using phytochromes
far red light
light with a wavelength of 700-800 nm, which is detected by plants using phytochromes
phytochrome
a plant pigment that reacts with different types of light, and as a result affects the responses of the plant
short-day plants (SDPs)
plants that flower when days are short and nights are long
long-day plants (LDPs)
plants that flower when days are long and nights are short
day-neutral plants (DNPs)
plants whose flowering is not affected by the length of time they are exposed to light or dark
florigen
plant hormone which appears to be involved in the photoperiodic response, it may be FTmRNA
etiolated
the form of plants which are grown in dark, with long internodes, thin stems, small or unformed leaves and white or pale yellow in colour
green fluorescent protein (GFP)
the product of a gene often used as a marker in the production of recombinant DNA
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