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Germination response of Eucalyptus globulus seeds exposed to low and high temperature stress

Citation

Rix, KD and Gracie, AJ and Potts, BM and Brown, PH and Spurr, CM and Gore, PL, Germination response of Eucalyptus globulus seeds exposed to low and high temperature stress, Seed Science and Technology, 39, (3) pp. 686-691. ISSN 0251-0952 (2011) [Refereed Article]


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Copyright Statement

Copyright 2011 International Seed Testing Association.

Official URL: http://www.ingentaconnect.com/content/ista/sst/201...

Abstract

Low seedling emergence rates of some seed lots of genetically elite Eucalyptus globulus Labill have been reported by nursery operators and hypothesized to be caused by high temperature stress. This study has confirmed that germination rate was sensitive to exposure to high temperatures. The optimum temperature for the germination rate of normal seedlings in this species was between 24.8C and 25.5C. At 25C, 96% of seeds produced normal seedlings after 21 days. The cardinal temperatures for development of normal Eucalyptus globulus seedlings were between 9.1C and 10.5C at low temperature and between 40.3C and 41.4C at high temperature. The optimum temperature for maximum attainment of normal seedlings was between 21.2C and 24.8C. Temperatures above 30C generally delayed commencement of germination, reduced total germination percentage, caused a high proportion of seed death and suppressed the development of normal seedlings. Low temperatures also delayed germination but caused less seed mortality. Despite general consistency in responses there was evidence that seed lots exhibit a differential response to temperature, particularly for normal seedling development at the extremes of temperature tested.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Forestry Sciences
Research Field:Forestry Sciences not elsewhere classified
Objective Division:Plant Production and Plant Primary Products
Objective Group:Other Plant Production and Plant Primary Products
Objective Field:Plant Production and Plant Primary Products not elsewhere classified
Author:Rix, KD (Dr Kieren Rix)
Author:Gracie, AJ (Dr Alistair Gracie)
Author:Potts, BM (Professor Brad Potts)
Author:Spurr, CM (Dr Cameron Spurr)
ID Code:74434
Year Published:2011
Web of Science® Times Cited:5
Deposited By:Agricultural Science
Deposited On:2011-11-30
Last Modified:2012-08-16
Downloads:4 View Download Statistics

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