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Titolo:
A thermal time basis for comparing the germination requirements of some British herbaceous plants
Autore:
Trudgill, DL; Squire, GR; Thompson, K;
Indirizzi:
Scottish Crop Res Inst, Dundee DD2 5DA, Scotland Scottish Crop Res Inst Dundee Scotland DD2 5DA Dundee DD2 5DA, Scotland Univ Sheffield, Dept Anim & Plant Sci, Unit Comparat Plant Ecol, SheffieldS10 2TN, S Yorkshire, England Univ Sheffield Sheffield S Yorkshire EnglandS10 2TN S Yorkshire, England
Titolo Testata:
NEW PHYTOLOGIST
fascicolo: 1, volume: 145, anno: 2000,
pagine: 107 - 114
SICI:
0028-646X(200001)145:1<107:ATTBFC>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
OILSEED RAPE; TEMPERATURE;
Keywords:
base temperature; thermal constant; development durations; dormancy; interspecific comparisons;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Trudgill, DL Scottish Crop Res Inst, Dundee DD2 5DA, Scotland Scottish Crop Res Inst Dundee Scotland DD2 5DA DA, Scotland
Citazione:
D.L. Trudgill et al., "A thermal time basis for comparing the germination requirements of some British herbaceous plants", NEW PHYTOL, 145(1), 2000, pp. 107-114

Abstract

The effect of temperature on germination rate was assessed for seeds of 31wild plant species and four cultivated species growing in the UK. The temperature at which seed first germinated ranged from 2 degrees C (Brassica rapa) to 11 degrees C (several species). As the temperature progressively increased, the percentage of seed that germinated rapidly increased to near 100%, whereas the duration for germination progressively decreased up to the thermal optimum. Above the thermal optimum, the duration for germination initially remained constant, and then rapidly increased until the thermal maximum was exceeded when no seed germinated. To assess the effect of temperature on germination rates, the reciprocal of the duration (1/duration) for 50% germination was calculated and regressed against temperature. For most species a linear regression accounted for > 90% of the variation in germination rates for temperatures up to the thermal optimum. From the regressions,the base temperatures (T-b, below which no germination is expected) and the thermal constant (S, expressed in degree days) for 50% germination were calculated. The extremes were the alpine species Dryas octopetala, which hada high T-b (c. 12.0 degrees C) and low S (26 degree days), and Saxifraga tridactylites which had a low estimated T-b (c. -1.8 degrees C) and a high S(136 degree days). The estimated value of S increased with increasing percentage germination, and although S varied considerably between species with similar values of T-b, a weak inverse relationship between T-b and S was indicated. A thermal time approach was shown to be useful when analysing and comparing thermal requirements for germination of the seed of wild plant species. It showed, for example, that percentage germination often decreased as temperatures approached T-b, and that for some seed germination ceased at temperatures well above T-b.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/08/20 alle ore 08:20:29