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Titolo:
Plant freezing and damage
Autore:
Pearce, RS;
Indirizzi:
Univ Newcastle Upon Tyne, Dept Biol & Nutr Sci, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England Univ Newcastle Upon Tyne Newcastle Upon Tyne Tyne & Wear England NE1 7RU
Titolo Testata:
ANNALS OF BOTANY
fascicolo: 4, volume: 87, anno: 2001,
pagine: 417 - 424
SICI:
0305-7364(200104)87:4<417:PFAD>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRICAL-IMPEDANCE ANALYSIS; INFRARED VIDEO THERMOGRAPHY; ANTIFREEZE PROTEIN; ICE NUCLEATION; FLOWER BUDS; EXTRACELLULAR ICE; COLD-ACCLIMATION; PLASMA-MEMBRANE; LOW-TEMPERATURE; CELL-SHAPE;
Keywords:
freezing; dehydration; infrared video thermography; low temperature scanning electron microscopy; NMR micro-imaging;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
62
Recensione:
Indirizzi per estratti:
Indirizzo: Pearce, RS Univ Newcastle Upon Tyne, Dept Biol & Nutr Sci, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England Univ Newcastle Upon Tyne Newcastle UponTyne Tyne & Wear England NE1 7RU
Citazione:
R.S. Pearce, "Plant freezing and damage", ANN BOTANY, 87(4), 2001, pp. 417-424

Abstract

Imaging methods are giving new insights into plant Freezing and the consequent damage that affects survival and distribution of both wild and crop plants. Ice can enter plants through stomata and hydathodes. Intrinsic nucleation of freezing can also occur. Thr initial growth of ice through the plant can be as rapid as 40 mm s(-1), although barriers can limit, this growth. Only a small fraction of plant water is changed to ice in this first freezing event. Nevertheless, this first rapid growth of ice is of key importance because it can initiate further, potentially lethal, freezing at any sitethat it reaches. Some organs and tissues avoid freezing by supercooling. However, supercooled parts of buds can dehydrate progressively, indicating that avoidance of freezing-induced dehydration by deep supercooling is only partial. Extracellular ice forms in Freezing-intolerant as well as freezing-tolerant species and causes cellular dehydration. The single most important cause of freezing-damage is when this dehydration exceeds what cells can tolerate. In freezing-adapted species, lethal freezing-induced dehydration causes damage to cell membranes. In specific cases, other factors map also cause damage, examples being cell death when limits to deep supercooling are exceeded, and death of shoots when freezing-induced embolisms in xylem vessels persist. Extracellular masses of ice can damage the structure of organs but this may be tolerated, as in extra-organ freezing of buds. Experiments to genetically engineer expression of fish antifreeze proteins have not improved Freezing tolerance of sensitive species. A better strategy may be to confer tolerance of cellular dehydration. (C) 2001 Annals of Botany Company.

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Documento generato il 18/01/21 alle ore 16:02:47