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tolerance

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Catalogue: GRDC Final Reports
As a consequence of the project UA00060, vital information has been obtained on the seedbank ecology and population dynamics of brome in response to various management strategies developed through on-farm research... Results from the survey of grower paddocks on Yorke (YP) and Eyre Peninsulas (EP) in South Australia (SA) confirmed the species of brome grass infesting cereal crops of southern Australia as Bromus diandrus and Bromus rigidus ... Several studies were undertaken at Roseworthy to investigate the germination behaviour of different populations of brome grass ( B. diandrus and B. rigidus ) collected from sites on YP and EP. Clear differences were shown between species, with populations of B. diandrus germinating at a much faster rate than its close relative, B. rigidus ...
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Catalogue: GRDC Media
Search for answers continues as frost bites in 2012.. Significant grain crop losses caused by frost in 2012, confirmed at harvest time, add to the sense of urgency to seek solutions to this issue - a major concern for most Western Australian grain growers... The scale of losses caused by frost is a prime reason for frost being a major priority for the Grains Research and Development Corporation (GRDC), which is funding different areas of frost research, development and extension (RD&E)...
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Catalogue: GRDC Updates
But I don't think it is that clear cut - most farmers in Australia would be pretty happy if they could achieve a 5t wheat crop, but if you belonged to the 10t club in Europe, and you only got enough rain for a 5t crop, you would claim you had suffered a pretty bad drought... The definition of drought is going to change dependent on your specific environment... By combining different parents of known good performance under drought, and then yield testing in the target environment we have been able to select varieties such as Gladius that perform exceptionally well under most drought conditions encountered by growers...
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Catalogue: GRDC Media
Significant grain crop losses caused by frost in 2012, confirmed at harvest time, add to the sense of urgency to seek solutions to this issue - a major concern for most Western Australian grain growers... The scale of losses caused by frost is a prime reason for frost being a major priority for the Grains Research and Development Corporation (GRDC), which is funding different areas of frost research, development and extension (RD&E)... A search for answers to frost has a heightened significance as an area of RD&E because its impact on the farm business is difficult to manage, with yield losses occurring when input costs have already been committed...
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Catalogue: GRDC Updates
The Australian National Frost Program (ANFP) was established in 2012 by UA, DAFWA and GRDC. Frost sensitivity ratings are being developed for current wheat and barley varieties to assist growers manage the risk of frost... Plant morphological traits are also measured as co-variates to help account for within plot variation... In total 76,461 heads were tagged and collected following a frost event and 2,879,650 individual florets assessed for frost induced sterility...
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Catalogue: GRDC Final Reports
The aim of this project was to develop standardised frost screening protocol that could then support future frost research for the Australian grains industry... The results showed that following a discriminatory frost event, the developed methods were able to reliably rank the frost tolerance of wheat and barley varieties... QTL mapping results from the current GRDC project UA00114 have identified that the QTL controlling frost tolerance on the group 2 chromosomes of barley and wheat are most likely related...
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Catalogue: Ground Cover
Considerable progress is being made to develop genetic 'tools' that plant breeders need to select heat-tolerant genotypes for future crops able to withstand heat stress... Grain samples from the field experiments are also being used to identify varieties that maintain better grain quality under heat stress in work led by Helen Taylor and Denise Pleming (NSW DPI, Wagga Wagga) and Dr Mike Sissons (NSW DPI, Tamworth)... An essential next step will be to quantify the yield benefits associated with the markers under normal rain-fed conditions and under various naturally occurring heat scenarios in different Australian wheat-growing regions...
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Catalogue: Ground Cover
Considerable progress is being made to develop genetic 'tools' that plant breeders need to select heat-tolerant genotypes for future crops able to withstand heat stress... Grain samples from the field experiments are also being used to identify varieties that maintain better grain quality under heat stress in work led by Helen Taylor and Denise Pleming (NSW DPI, Wagga Wagga) and Dr Mike Sissons (NSW DPI, Tamworth)... An essential next step will be to quantify the yield benefits associated with the markers under normal rain-fed conditions and under various naturally occurring heat scenarios in different Australian wheat-growing regions...
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Catalogue: GRDC Updates
The SAGIT funded project involves using a controlled environment assay that is run at Roseworthy, to identify and quantify the level of heat stress tolerance in current varieties, advanced breeders lines and exotic lines, as well as using 'gene mapping', to genetically dissect and understand the key sources of tolerance identified to date... Figure 1 illustrates the fertility and grain size response for a subset of varieties to heat stress in the controlled environment assay. In general heat stress causes a significant (p<0.05) reduction in both grain number and grain size, the two key yield components and ultimately grain yield... A subset of exotic introductions that have been screened for heat stress tolerance in the controlled environment assay, showing diverse levels of adaption...
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Catalogue: Ground Cover
Australian Grain Technologies, with funding from the South Australian Grains Industry Trust, is using heat chambers as part of its research examining wheat traits important to heat-stress tolerance... Research funded by the South Australian Grains Industry Trust (SAGIT) and the GRDC at Australian Grain Technologies (AGT) is investigating wheat traits that are important to heat stress tolerance, undertaking genetic mapping of genomic regions affecting heat tolerance and characterising parents to select for this trait... Breeders could potentially select for heat tolerance using traits for grain number, size and rate of filling under heat stress...
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