Search results
Results from the WOW.Com Content Network
Water stress (drought and salt stress) is one of the major environmental problems causing severe losses in agriculture and in nature. Drought tolerance of plants is mediated by several mechanisms that work together, including stabilizing and protecting the plant from damage caused by desiccation and also controlling how much water plants lose through the stomatal pores during drought.
English: Opening and Closing of Stomata 1-Epidermal cell 2-Guard cell 3-Stoma 4-K+ ions 5-Water 6-Vacuole a. Open stoma: stomata are the small pores in the epidermis of leaves. They are bordered by guard cells. The stomata open when the turgor pressure increases in the guard cells, causing the cells to buckle outward.
Stoma in a tomato leaf shown via colorized scanning electron microscope image A stoma in horizontal cross section The underside of a leaf. In this species (Tradescantia zebrina) the guard cells of the stomata are green because they contain chlorophyll while the epidermal cells are chlorophyll-free and contain red pigments.
The closing of the stomata is often mediated by chemical signals from the root (i.e., abscisic acid). In irrigated fields, the fact that plants close their stomata in response to drying of the roots can be exploited to 'trick' plants into using less water without reducing yields (see partial rootzone drying).
Stomatal conductance, usually measured in mmol m −2 s −1 by a porometer, estimates the rate of gas exchange (i.e., carbon dioxide uptake) and transpiration (i.e., water loss as water vapor) through the leaf stomata as determined by the degree of stomatal aperture (and therefore the physical resistances to the movement of gases between the air and the interior of the leaf).
The only answer I can hope to receive when I ask “why” is something about the intention of their designer, like that they wanted to give it the appearance of blossoming, or make it pass more ...
Sodium can potentially replace potassium's regulation of stomatal opening and closing. [6] Essentiality of sodium: Essential for C4 plants rather C3; Substitution of K by Na: Plants can be classified into four groups: Group A—a high proportion of K can be replaced by Na and stimulate the growth, which cannot be achieved by the application of K
A stand mixer is an absolute powerhouse when it comes to kitchen appliances. From homemade bread to cakes and pie crust, there's nothing that machine can't do–but are you making critical ...