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dc.contributor.authorMichael, Pippa
dc.contributor.authorSteadman, K.
dc.contributor.authorPlummer, J.
dc.date.accessioned2017-01-30T15:38:34Z
dc.date.available2017-01-30T15:38:34Z
dc.date.created2015-09-29T01:51:47Z
dc.date.issued2006
dc.identifier.citationMichael, P. and Steadman, K. and Plummer, J. 2006. Climatic regulation of dormancy and emergence of diverse Malva parviflora populations from a Mediterranean-type environment. Seed Science Research. 16 (4): pp. 273-281.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/48266
dc.identifier.doi10.1017/SSR2006254
dc.description.abstract

Malva parviflora L. (Malvaceae) is rapidly becoming a serious weed of Australian farming systems. An understanding of the variability of its seed behaviour is required to enable the development of integrated weed management strategies. Mature Malva parviflora seeds were collected from four diverse locations in the Mediterranean-type climatic agricultural region of Western Australia. All of the seeds exhibited physical dormancy at collection; manual scarification or a period of fluctuating summer temperatures (50/20oC and natural) were required to release dormancy. When scarified and germinated soon (1 month) after collection, the majority of seeds were able to germinate over a wide range of temperatures (5-37oC) and had no light requirement. Germination was slower in seeds stored for 2 months than seeds stored for 2 years suggesting the presence of shallow physiological dormancy. Seed populations from regions with similar annual rainfall exhibited similar dormancy release patterns; seeds from low rainfall areas (337 – 344 mm) were more responsive to fluctuating temperatures, releasing physical dormancy earlier than those from high rainfall areas (436 – 444 mm). After 36 months, maximum seedling emergence from soil in the field was 60% with buried seeds producing 13 – 34% greater emergence than seeds on the surface. Scanning electron microscopy of the seed coat revealed structural differences in the chalazal region of permeable and impermeable seeds indicating the importance of this region in physical dormancy breakdown of M. parviflora seeds. The influence of rainfall during plant growth in determining dormancy release, and hence germination and emergence timing, must be considered when developing management strategies for M. parviflora.

dc.publisherCABI Publishing
dc.subjectMalvaceae
dc.subjectwater-impermeable
dc.subjectweed
dc.subjectphysical dormancy
dc.subjectseed coat
dc.titleClimatic regulation of dormancy and emergence of diverse Malva parviflora populations from a Mediterranean-type environment
dc.typeJournal Article
dcterms.source.volume16
dcterms.source.number4
dcterms.source.startPage273
dcterms.source.endPage281
dcterms.source.issn09602585
dcterms.source.titleSeed Science Research
curtin.accessStatusFulltext not available


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