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Effect of boiling water, seed coat structure and provenance on the germination of Acacia melanoxylon seeds

Burrows, G E; Virgona, James M; Heady, Roger

Description

Acacia melanoxylon (Mimosoideae or Mimosaceae) is a high quality timber tree with an extensive natural distribution in Australia and a wide genetic and phenotypic diversity. Seeds from three widely differing provenances in Tasmania were tested to determine whether they had different responses to various dormancy-breaking treatments. All provenances had limited germination (<11%) if seeds were untreated and between 85% and 91% germination after 40 days if the seeds were nicked. For all...[Show more]

dc.contributor.authorBurrows, G E
dc.contributor.authorVirgona, James M
dc.contributor.authorHeady, Roger
dc.date.accessioned2015-12-10T22:57:08Z
dc.identifier.issn0067-1924
dc.identifier.urihttp://hdl.handle.net/1885/60524
dc.description.abstractAcacia melanoxylon (Mimosoideae or Mimosaceae) is a high quality timber tree with an extensive natural distribution in Australia and a wide genetic and phenotypic diversity. Seeds from three widely differing provenances in Tasmania were tested to determine whether they had different responses to various dormancy-breaking treatments. All provenances had limited germination (<11%) if seeds were untreated and between 85% and 91% germination after 40 days if the seeds were nicked. For all provenances short (≤60s) exposure to boiling water gave high germination percentages. These values were generally lower, although usually not significantly so, than the germination percentages following nicking. Germination percentages decreased with increasing time of exposure to boiling water, although one provenance had a significantly greater tolerance to one of the longer (20min) treatments. Nicked seeds germinated quickly and uniformly, whereas those subjected to the boiling-water treatments germinated after a longer period and more gradually. In untreated seeds, the lens was a low, elliptically shaped dome (∼110-135μm wide, 140-190μm long). In more than 99% of the seeds examined, the structure of the lens was markedly altered after a 10-s exposure to boiling water. A wide diversity of altered lens structure was found, from a circular hole between the macrosclereids, to a short fissure where the macrosclereids did not separate to their bases. Nicked seeds had a 200-375 times greater area for water uptake than a fully disrupted lens and this was probably the principal reason why the nicked seeds germinated sooner and more rapidly.
dc.publisherCSIRO Publishing
dc.sourceAustralian Journal of Botany
dc.subjectKeywords: genetic variation; germination; legume; phenotypic plasticity; population distribution; provenance; seed dormancy; timber; wood quality; Australasia; Australia; Tasmania; Acacia; Acacia melanoxylon; Fabaceae; Lens (angiosperm); Mimosoideae
dc.titleEffect of boiling water, seed coat structure and provenance on the germination of Acacia melanoxylon seeds
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume57
dc.date.issued2009
local.identifier.absfor060703 - Plant Developmental and Reproductive Biology
local.identifier.ariespublicationu4105084xPUB545
local.type.statusPublished Version
local.contributor.affiliationBurrows, G E, Charles Sturt University
local.contributor.affiliationVirgona, James M, Charles Sturt University
local.contributor.affiliationHeady, Roger, College of Medicine, Biology and Environment, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue2
local.bibliographicCitation.startpage139
local.bibliographicCitation.lastpage147
local.identifier.doi10.1071/BT08194
dc.date.updated2016-02-24T10:36:20Z
local.identifier.scopusID2-s2.0-67649400525
CollectionsANU Research Publications

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