What is the physical basis of the phototropic?
What is the physical basis of the phototropic response? Auxin is asymmetrically distributed in shoots because the auxin on the side of the plant facing the source of light is destroyed.
How does auxin produce Phototropism?
Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant. This produces a curving of the plant stem tip toward the light, a plant movement known as phototropism.
What is the initial localized response of a resistant plant to pathogen invasion?
What is the initial localized response of a resistant plant to pathogen invasion? Hypersensitive response.
How does auxin produce Phototropism quizlet?
How does auxin produce phototropism? Auxin accumulates in cells on the side of the plant facing the source of light and stimulates their elongation. Auxin accumulates in cells on the side of the plant facing the source of light and causes them to shorten.
What is the physical basis of the phototropic response mastering bio?
What is the physical basis of the phototropic response? Cell elongation.
What is phototropic movement?
“Photo” means light, and “tropism” means turning. Phototropism is the phenomenon by which the plant bends in the direction of light. Light is required by the plants to stimulate energy production by the process of photosynthesis.
What triggers SAR in plants?
SAR is a systemic defense network in plants that is triggered by exposing the plant to some virulent, avirulent, and nonpathogenic microbes (Heil and Bostock, 2002; Vallad and Goodman, 2004) and involves salicylic acid (SA) or its derivative, methyl salicylate, as the key signal (Durrant and Dong, 2004; Beckers and ...
What triggers hypersensitive response?
Mechanism. HR is triggered by the plant when it recognizes a pathogen. The identification of a pathogen typically occurs when a virulence gene product, secreted by a pathogen, binds to, or indirectly interacts with the product of a plant R gene.
What is the hypersensitive response in plants?
Simply put, the plant hypersensitive response (HR) is a rapid localized cell death that occurs at the point of pathogen penetration and is associated with disease resistance.
How does auxin enhances cell elongation?
The plant hormone auxin is well known to stimulate cell elongation via increasing wall extensibility. Auxin participates in the regulation of cell wall properties by inducing wall loosening.
What is meant by positive phototropism quizlet?
A positive phototropism occurs when a plant grows towards the light source.
What is a plant's response to touch?
Thigmotropism is a directional growth movement which occurs as a mechanosensory response to a touch stimulus. Thigmotropism is typically found in twining plants and tendrils, however plant biologists have also found thigmotropic responses in flowering plants and fungi.