You are here

grain dormancy

Categorised under:

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...
Related categories:
Catalogue: GRDC Final Reports
The research has made a significant contribution to our understanding of the mechanisms underlying these traits, identified novel strategies for further or more rapid improvements, and provides a solid foundation for both further research and better management of defects that result in downgrading of quality prior to harvest.. Annual screening of advanced lines from Australian breeding programs suggests little improvement in sprouting resistance despite breeders having had access to resistant germplasm and quantitative trait loci (QTL) information for a considerable period... Our work in Brachypodium presents a novel opportunity to use an undomesticated wild grass to identify novel sources of high dormancy germplasm...
Related categories:
Catalogue: GRDC Final Reports
The project has provided technological support to improve sprouting resistance in wheat by Australian wheat breeders by annual phenotyping of advanced breeding lines, development of improved screening technologies including molecular markers, and germplasm with improved sprouting resistance based on grain dormancy... Given that grain dormancy is a difficult trait to manipulate due to interactions with both maturity and the environment, molecular markers tightly linked to the major QTLs are a high priority... Results from dormant x non-dormant crosses and reciprocal crosses indicate that 2-3 QTLs or genes are involved in dormancy in white-grained as well as red-grained wheat genotypes whilst the patterns of phenotype expression are consistent with a model involving an interaction between an embryo factor (sensitivity to abscisic acid (ABA) that declines during after-ripening, most probably the 4A QTL) and at least one other factor that is expressed in the seed coat...
Related categories:
Catalogue: Ground Cover
Two genes related to dormancy (which prevents untimely germination leading to pre-harvest sprouting) have been discovered.. New gene-discovery techniques also mean an accelerated process for isolating potentially important wheat genes for other traits.. In terms of knowing which grain-growing regions these genes will work in, given that not all varieties are suited across the country, Dr Gubler says it is not known how these genes actually confer dormancy, although the researchers do know the expression of the genes is suppressed by high temperatures during grain development - and this then elevates the risk of PHS...
Related categories:
Catalogue: Ground Cover
Two genes related to dormancy (which prevents untimely germination leading to pre-harvest sprouting) have been discovered.. New gene-discovery techniques also mean an accelerated process for isolating potentially important wheat genes for other traits.. In terms of knowing which grain-growing regions these genes will work in, given that not all varieties are suited across the country, Dr Gubler says it is not known how these genes actually confer dormancy, although the researchers do know the expression of the genes is suppressed by high temperatures during grain development - and this then elevates the risk of PHS...
Related categories:
Catalogue: GRDC Final Reports
The results suggest that breeding programs could use CEC to characterise fixed lines for grain dormancy, perhaps during the off-season to complement field evaluation in the main growing season... The objective of the study was to investigate the ability to characterise and screen for grain dormancy using grain grown under CEC, utilising an extended photoperiod... The results were achieved within a relatively short time period (18 months from production of the dormant x non-dormant F1 crosses, screen segregating populations for grain dormancy and derive F4:5 lines)...
Related categories: