An enlarged portion of a rhizome (under ground stem) that stores food. Trait A character Testa The Seed Coat. It is derived from the integuments and is several layers thick. It is protective in function. Tolerance 1. The ability of a plant to with Stand adverse environmental Conditions. The ability of a plant to withstand the development of a parasite within it, without showing serious symptoms of disease. Triploid Organisms or cell with three sets of chromosomes.
A type of modified stem or root, consisting of enlarged subterranean storage tissue. Potato tubers are stem tissue which have nodes, or "eyes", from which whole plants are propagated. Sweet potato tubers have similar nodal structures but are actually root, not stem, tissue.
The swollen portion of an underground stem or root which acts as a storage organ and propagule; it is usually of one year's duration, those of successive years not arising directly from the old ones nor bearing any constant relation to them.
A tuber, or stem tuber, is a development of a stolon, or above-ground rhizome, thickened for use as a storage organ. The tuber usually, though not always, develops when the stolon becomes subterranean, such as in a potato. This modified stem forms at the end of a lateral branch.
The true truffles are a group of several valuable and highly sought-after edible species of underground ascomycetes belonging to the fungal genus Tuber. All are ectomycorrhizal and are therefore found in close association with trees.