Manganese

Manganese [ Chemistry ]
Abbreviation: Mn

Dictionary of botanic terminology - index of names

Manganese deficiency [ Horticulture - Phytopathology ]


	Absence or insufficiency of manganese needed for normal growth and development.

Deficiency symptoms first appear on young tissue and are very similar to iron deficiency, except that the persistent band of green along the leaf veins is broader. The interveinal chlorosis (yellowing of leaf tissue between the veins) is not as severe as with iron deficiency and there is little reduction in leaf size associated with this disorder. Severe cases of manganese deficiency symptoms are not common in ornamental plants.

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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