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Hydrotropism requires a root to bend from a drier to a wetter soil zone. Roots require water to grow so roots that happen to be in moist soil will grow and branch much more than those in dry soil. Roots cannot sense water inside intact pipes via hydrotropism and break the pipes to obtain the water.
Root primordia (brown spots) as seen on the butt of a freshly cut pineapple crown intended for vegetative reproduction. A primordium (/ p r aɪ ˈ m ɔːr d i ə m /; pl.: primordia; synonym: anlage) in embryology, is an organ or tissue in its earliest recognizable stage of development. [1] Cells of the primordium are called primordial cells. A ...
Bromelain is present in all parts of the pineapple plant (Ananas sp.), [4] but the stem is the most common commercial source, [4] [5] presumably because usable quantities are readily extractable after the fruit has been harvested.
There is also a pressure change between the top and bottom of the xylem vessels, due to water loss from the leaves. This reduces the pressure of water at the top of the vessels. This means water moves up the vessels. The last stage in the transpiration stream is the water moving into the leaves, and then the actual transpiration. First, the ...
Pineapple black rot: Chalara paradoxa = Thielaviopsis paradoxa Ceratocystis paradoxa [teleomorph] Leaf spot Curvularia eragrostidis Cochliobolus eragrostidis [teleomorph] Phytophthora heart rot Phytophthora cinnamomi Phytophthora nicotianae var. parasitica = Phytophthora parasitica. Root rot Pythium spp. Pythium arrhenomanes. Seedling blight ...
Root sprouts and basal shoots can be used to propagate woody plants. Root sprouts can be dug or severed with some of the roots still attached. As for basal shoots, stool beds involve cutting a juvenile plant proximate to the surface of the soil and heaping soil over the cut so that basal shoots will form adventitious roots and later can be ...
As the epidermis of the plant is covered with water barriers such as lignin and waxy cuticles, the night opening of the stomata is the main channel for water movement for xerophytes in arid conditions. [12] Even when water is not scarce, the xerophytes A. Americana and pineapple plant are found to utilise water more efficiently than mesophytes ...
Root pressure: If the water potential of the root cells is more negative than that of the soil, usually due to high concentrations of solute, water can move by osmosis into the root from the soil. This causes a positive pressure that forces sap up the xylem towards the leaves.