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Titolo:
Freezing of barley studied by infrared video thermography
Autore:
Pearce, RS; Fuller, MP;
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 Univ Plymouth, Seale Hayne Fac, Dept Agr & Food Studies, Newton Abbot TQ126NQ, Devon, England Univ Plymouth Newton Abbot Devon England TQ12 6NQ TQ126NQ, Devon, England
Titolo Testata:
PLANT PHYSIOLOGY
fascicolo: 1, volume: 125, anno: 2001,
pagine: 227 - 240
SICI:
0032-0889(200101)125:1<227:FOBSBI>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
ICE NUCLEATION; EXTRACELLULAR ICE; CELL-SHAPE; PLANTS; PROPAGATION; ACCLIMATION; TOLERANCE; TISSUES; INJURY; LEAVES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
34
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 e M.P. Fuller, "Freezing of barley studied by infrared video thermography", PLANT PHYSL, 125(1), 2001, pp. 227-240

Abstract

Freezing of barley (Hordeum vulgare), Hordeum murinum, and Holcus lanatus was studied using infrared video thermography. In the field, ice could enter H. lanatus leaves through hydathodes. In laboratory tests with barley, initially 0.4% of the leaf water froze, spreading in alternate strips of highand low freezing intensity longitudinally at 1 to 4 cm s(-1), and simultaneously spreading laterally at 0.3 cm s(-1). Similar results were obtained in the field with H. lanatus. A distinct second, more intense, freezing event spread slowly from the margins of the leaves toward the midrib. Organs ofuprooted barley tested in the laboratory froze in this order: nucleated leaf, roots, older leaves, younger leaves, and secondary tillers. When ice spread from one leaf to the rest of the plant the crown delayed spread to theroots and other leaves. There was a longer delay above than below -2 degreesC, helping to protect the crown from freezing during mild frosts. Initialspread of freezing was not damaging. However, the initial spread is a prerequisite for the second freezing event, which can cause damage. The route of the initial spread of ice may be extracellular, drawing water from more gel-like parts of the cell wall.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/01/21 alle ore 23:24:01