* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download plant_tropism
Survey
Document related concepts
Arabidopsis thaliana wikipedia , lookup
Cultivated plant taxonomy wikipedia , lookup
Historia Plantarum (Theophrastus) wikipedia , lookup
Venus flytrap wikipedia , lookup
History of botany wikipedia , lookup
Stimulus (physiology) wikipedia , lookup
Plant use of endophytic fungi in defense wikipedia , lookup
Ornamental bulbous plant wikipedia , lookup
Plant defense against herbivory wikipedia , lookup
Hydroponics wikipedia , lookup
Plant secondary metabolism wikipedia , lookup
Sustainable landscaping wikipedia , lookup
Plant physiology wikipedia , lookup
Transcript
PLANT RESPONSES How plants move and communicate TROPISMS Tropisms are the growth of a plant toward or away from a stimulus, including: Phototropism: in response to light Gravitropism (geotropism): in response to gravity Thigmotropism: in response to touch Auxins are plant growth hormones that promote elongation of cells TROPISMS: CELL ELONGATION In general, tropisms involve cell elongation or suppression of cell elongation on one side of a plant, causing the plant to grow in a particular direction. PHOTOTROPISM Look at the sprouts in the bottom picture and the explanatory diagram at the top. GRAVITROPISM In this plant, shoots grow upwards and roots grow downwards in response to gravity. On which side of the shoot and root do you think auxins are more concentrated? GRAVITROPISM IN ROOTS In roots, however, auxin concentration on the lower side of the root suppresses cell elongation. The upper side of the root continues to grow, causing the roots to bend downward. THIGMOTROPISM In some plants, vining stems or tendrils will grow in response to touch.