Chlorine

Chlorine [ Chemistry ]
Abbreviation: Cl

Dictionary of botanic terminology - index of names

Chlorine deficiency [ Horticulture - Phytopathology ]


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

Chlorine is rarely, if ever, deficient in plants growing in nature because of its high solubility and availability in soils and because it is also transported in dust or in tiny moisture droplets by wind and rain to the leaves where absorption occurs. When chlorine deficiency does occur, however, it causes leaves to wilt and change in colour from green through to yellow, eventually becoming a bronze colour.

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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