Rot

Rot (Rotten - Rottenness) [ Phytopathology ]		Dictionary of botanic terminology index of names
Synonym: Putrefaction, Decomposition, Decay.

The process of decay caused by bacterial or fungal action often accompanied by an offensive odour.

The decomposition ( process of rotting) is the reduction of bodies or tissues of formerly living organisms into simpler forms of matter.
Plant rot: Disintegration and decomposition of plant tissue is usually caused by fungal or bacterial attack Rot typically results from damp conditions. Rot may be put in an appearance by softening, discoloration, and often disintegration of a succulent plant tissue, while woody tissues can be spongy or stringy.
The word rot also refers to or is part of the name of several diseases characterized by this symptom. For example:

Soft rot: a mushy, watery, or slimy decay of plants or their parts caused by bacteria or fungi
Crown rot: a disease near the bases of plants. Plants yellow, wilt, and die.
Root Rot: a soilborne fungus that affect roots. Due to poor soil aeration and drainage.
Black rot: Any of several fungous diseases of plants that produce small black spots on the leaf or stems of many plant species.
Dry Rot (Brown Rot): Wood decay caused by certain fungi. Dry rot will not remain localized.
White-Rot: Wood decay attacking both the cellulose and the lignin, producing a generally whitish residue that may be spongy or stringy.
Ring rot: Wood rot localized mainly in the springwood of the growth rings, giving a concentric pattern of decayed wood in the cross section of a tree.

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Holdfast roots [ Botany ]
Dictionary of botanic terminology - index of names

Some species of climbing plants develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place.

Climbing plants, like the poison ivy (Toxicodendron radicans), Boston ivy (Parthenocissus tricuspidata), and trumpet creeper (Campsis radicans), develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place. Usually the Holdfast roots die at the end of the first season, but in some species they are perennial. In the tropics some of the large climbing plants have hold-fast roots by which they attach themselves, and long, cord-like roots that extend downward through the air and may lengthen and branch for several years until they strike the soil and become absorbent roots.

Major references and further lectures:
1) E. N. Transeau “General Botany” Discovery Publishing House, 1994