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The effect of time of harvest, irrigation treatments and kilning temperature on Eucalyptus globulus seed germination response to high temperature stress

Citation

Rix, KD and Gracie, AJ and Potts, BM and Brown, PH and Spurr, CJ and Gore, PL, The effect of time of harvest, irrigation treatments and kilning temperature on Eucalyptus globulus seed germination response to high temperature stress, Seed Science and Technology, 40, (2) pp. 185-199. ISSN 0251-0952 (2012) [Refereed Article]


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Copyright Statement

Copyright 2012 International Seed Testing Association

Official URL: http://www.seedtest.org/en/seed-science-and-techno...

DOI: doi:10.15258/sst.2012.40.2.04

Abstract

Low seedling emergence rates of some Eucalyptus globulus seed-lots have been reported and hypothesised to be caused by high temperature stress. This study tested the effects of time of seed harvest, kilning temperature at seed extraction and irrigation treatments applied to E. globulus trees on seed germination traits. Seeds were harvested from three genotypes at 11 months from commencement of flowering (early), 13 months (commercial) and 15 months (late) and kiln dried at 30, 40 or 50C. Irrigation treatments were full irrigation, half irrigation and no irrigation. Six traits describing the proportion and rate of seed germination and early seedling development were studied. The kilning temperature of capsules and irrigation treatments applied to trees had no effect on the germination traits studied. Time of seed harvest affected the rates of seed germination and normal seedling development. There was little delay in germination rate at 32C in early-harvested seeds compared with that experienced by the commercial- and late-harvested seeds, suggesting that it has a higher temperature threshold. However, the effect of harvest date on germination was genotype dependent which may be related to different heat sums to which developing seeds are exposed.

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, CJ (Dr Cameron Spurr)
ID Code:78242
Year Published:2012
Web of Science® Times Cited:1
Deposited By:Agricultural Science
Deposited On:2012-06-19
Last Modified:2013-05-14
Downloads:1 View Download Statistics

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