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adult plant resistance

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Catalogue: GRDC Research Summaries
Foliar diseases are a major constraint to national wheat yield stability, and cause annual industry wide costs ranging from yield loss and down grading of grain, to chemical control expenses and removal of preferred varieties from recommendation lists... The importance of wheat diseases to Australian cereal producers was highlighted in a GRDC commissioned study that was published in September 2009... The study by Murray and Brennan (2009) on the economic impact of wheat diseases estimated that stripe rust caused current.....
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Catalogue: GRDC Final Reports
The time factor was changed by growing more generations per year and reducing the degree of homozygosity required before lines are evaluated in yield trials or used as parents... j) Co-operative research DAQ00110 involved cooperation activities for several related projects including the Australian Wheat and Barley Molecular Marker Program (AWBMMP) designed to study attributes needed for the future improvement of barley... QTL associated with barley ( Hordeum vulgare ) feed quality traits measured through in situ digestion...
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Catalogue: GRDC Final Reports
Technologies developed for the reliable phenotyping of lines and screening of segregating populations for adult plant resistance to leaf, stem and stripe rust in wheat, and leaf rust in barley, using plants grown under controlled environment conditions (temperature and light), will facilitate the more rapid development of new wheat and barley varieties... The new QTL are not linked with unfavourable QTL for malt quality (as was the case with previously documented major QTL conferring grain dormancy in barley) nor with intolerance to heat (as was the case with the mlo source of resistance to powdery mildew)... Novel QTL identified in barley need to be evaluated in populations with higher levels of recombination to validate QTL effects in different backgrounds, and to identify markers more closely linked to these QTL...
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Catalogue: GRDC Research Summaries
The process of moving new resistance genes in the adapted genetic background of released varieties of cereals such as wheat and barley, is slow... Hickey LT, Lawson W, Platz GJ, Fowler RA, Arief V, Dieters M, Germ?n S, Fletcher S, Park RF, Singh D, Pereyra S, Franckowiak J (2012) Mapping quantitative trait loci for partial resistance to powdery mildew in an Australian barley population... Genome 55:396?399 Hickey LT, Lawson W, Platz GJ, Dieters M, Arief VN, Germ?n S, Fletcher S, Park RF, Singh D, Pereyra S, Franckowiak J (2011) Mapping Rph20: a gene conferring adult plant resistance to Puccinia hordei in barley...
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Catalogue: GRDC Media
Adult plant resistance (APR) to cereal fungal diseases is an important trait for grain growers to consider when choosing varieties to sow... APR can complement a fungicide strategy by protecting, from diseases such as rust, those parts of the plant most responsible for yield... Adult plant resistance is a useful trait to consider in variety selection, and understanding how it works can make fungicide application decisions easier...
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Catalogue: GRDC Final Reports
A new source of leaf rust resistance from a wild diploid Avena species was successfully transferred to a Wintaroo derived breeding line... Several new sources of stem rust resistance were identified in wild oat species with partial resistance to Pga 512, the most virulent strain in Australia for which there are no other known sources of resistance... Further investigations need to be conducted to determine if these two molecular markers are reliable indicators of the presence of the alien chromosome carrying leaf rust resistance...
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Catalogue: GRDC Research Summaries
The project will characterise four major foliar pathogens of barley in Australia... Virulence gene profiles of net form net blotch (Pyrenophora teres f teres), spot form net blotch (P. t. f. maculata), powdery mildew (Blumeria graminis f. sp... Presenter: G. Platz, R. Fowler; Audience Number & Nature: 20 GRDC Crop Protection Committee, AgriScience Queensland Crop Protection researchers and managers: Location: Toowoomba Qld; Date: 5/08/2010 Conference papers Barsby J, Stephen K, Platz G and Franckowiak J (2009) Selection for resistance to net form and spot form of net blotches using mixed inoculum...
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Catalogue: GRDC Updates
Adult plant resistance (APR) This form of resistance is not effective at the seedling stage but increases in effectiveness as the plant develops... Some resistance genes are affected more by temperature... Adult plant resistance and problems with variety disease ratings Because APR is controlled by different minor genes that operate through different mechanisms, the growth stage at which the resistance is expressed and the environmental conditions under which it is best expressed vary from one variety to another...
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Catalogue: GRDC Final Reports
There is a need to identify molecular markers linked to minor genes controlling resistance that are suitable for implementation in breeding... Achievements in identifying molecular markers and their genetic inheritance developed during this project have provided tools needed to track and select lines from breeding populations... Included in the agreement are other sources of resistance and homozygous populations that can be accessed by DAFWA in future collaborative research to identify and characterise novel sources of SNB resistance...
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Catalogue: GRDC YouTube channel
" GCTV9: Cereal Rust - Adult Plant Resistance 17 December 2012 Understanding how Adult Plant Resistance to cereal rust works... If you had a paddock full of it you 90.909: to know when the adult plant resistance might kick in. 93.229: Robert Park: Depends on the actual gene we're talking about 96.07: but typically as a rule of thumb this occurs around tillering to node formation in the 101.85: plant growth cycle... 399.839: Rohan Rainbow: More than 25% of the varieties grown in the 402.289: Southern region are actually susceptible and that's created some real challenges because 404.949: the inoculum is very high of stripe rust and as a consequence of that we've seen a lot 409.319: of green bridge and consequential mutation of pathotypes and what we're seeing now is 416.129: a rapid development of new pathotypes which are knocking out the resistance genes that 420.999: we have in a number of varieties...
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