What is plant stress response?
Definition. Plant stress responses describe the suite of molecular and cellular processes that are triggered by the detection by the plant of some form of stress. Stresses can be abiotic, such as drought or excess light, or biotic, such as herbivores or pathogens.
What is stress sensing mechanism in plants?
As sessile organisms, plants must cope with abiotic stress such as soil salinity, drought, and extreme temperatures. Core stress-signaling pathways involve protein kinases related to the yeast SNF1 and mammalian AMPK, suggesting that stress signaling in plants evolved from energy sensing.
How do plants respond to environmental stress?
The many facts of plant responses to abiotic stresses may include morphological and cytological changes, alternation in metabolic pathways and transcriptional regulation of genes.
How does plant respond to abiotic stress?
These responses include alterations in photosynthetic rates, assimilate translocation, nutrient uptake and translocation, changes in water uptake, and evapotranspiration [31]. Among these, photosynthesis is one of the most critical plant processes affected by various abiotic stresses [31, 32].
What is stress in plants Slideshare?
Like all other living organisms, the plants are subjected to various environmental stresses such as water deficit and drought, cold, heat, salinity and air pollution etc. ۞ The concept of stress is associated with stress tolerance. Degree of tolerance differs with different plant species.
What is stress in agriculture?
Abstract. A stress in crop production is considered as something that decreases yield, and a growth promoter is something the increases yield. Officially, granting and governmental agencies consider that many inputs that improve crop production as not being related to stress.
How do plants respond to biotic stress?
Plants respond to biotic stress through a defense system. The defense mechanism is classified as an innate and systemic response. After infection, reactive oxygen species (ROS) are generated and oxidative bursts limit pathogen spread (Atkinson and Urwin, 2012).
How do plants respond to drought stress?
The immediate response of plants on being exposed to drought stress is stomatal closure. However, stomatal closure not only diminishes water loss through transpiration but also reduces CO 2 and nutrient uptake, and hence alters metabolic pathways such as photosynthesis 55.
What is a plant’s typical response to water stress quizlet?
a response to water stress is to increase the growth of the root system relative to that of the shoot system. Under water stress, the rate of photosynthesis per unit leaf area tends to be much less affected than leaf expansion.
What defense mechanisms do plants have?
Mechanical Defenses The first line of defense in plants is an intact and impenetrable barrier composed of bark and a waxy cuticle. Both protect plants against herbivores. Other adaptations against herbivores include hard shells, thorns (modified branches), and spines (modified leaves).
What is flooding stress in plants?
Flooding is a compound stress composed of interacting changes inside plant cells induced by the flood water surrounding the plant. The concentrations of oxygen (O2), CO2, reactive oxygen species (ROS) and ethylene change upon flooding and can occur in various combinations, as determined by the flooding regime.