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https://hdl.handle.net/2440/54987
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Type: | Journal article |
Title: | Grain dormancy in fixed lines of white-grained wheat (Triticum aestivum L.) grown under controlled environmental conditions |
Author: | Hickey, L. Dieters, M. DeLacy, I. Kravchuk, O. Mares, D. Banks, P. |
Citation: | Euphytica: international journal on plant breeding, 2009; 168(3):303-310 |
Publisher: | Kluwer Academic Publ |
Issue Date: | 2009 |
ISSN: | 0014-2336 1573-5060 |
Statement of Responsibility: | Lee T. Hickey, Mark J. Dieters, Ian H. DeLacy, Olena Y. Kravchuk, Daryl J. Mares and Phillip M. Banks |
Abstract: | Pre-harvest sprouting (PHS) in wheat (Triticum aestivum L.) can be a significant problem, causing deleterious effects on grain quality. However, the adverse impacts of PHS can be reduced by introgressing genes controlling grain dormancy into white-grained bread wheat. Screening for grain dormancy typically involves germination testing of harvest-ripe grain grown in a glasshouse or field. However, the more uniform environmental conditions provided by temperature controlled glasshouses (i.e. controlled environmental conditions-CEC) may provide significant benefits for the assessment of grain dormancy. In this study, the dormancy phenotype of grain grown under CEC incorporating an extended photoperiod, was compared with 2 years of data from field grown material. Four dormant double haploid lines (derived from SW95-50213 and AUS1408) and two locally adapted non-dormant cultivars EGA Gregory and EGA Wills were compared in three replicated experiments grown under CEC (22 ± 3°C and 24 h photoperiod). The germination response of harvest-ripe grain was examined to assess the expression of grain dormancy. Two measures of germination, the predicted time to 50% germination (G50) and a weighted germination index, both clearly differentiated dormant and nondormant lines grown under CEC. In addition, levels of grain dormancy were similar to field-grown plants. These results demonstrated that CEC with an extended photoperiod can be used for rapid and reliable characterisation of grain dormancy in fixed lines of bread wheat. © Springer Science+Business Media B.V. 2009. |
Keywords: | Controlled temperature glasshouse Extended photoperiod Germination index Germination response Phenotypic screen Pre-harvest sprouting Wheat breeding |
DOI: | 10.1007/s10681-009-9929-0 |
Published version: | http://dx.doi.org/10.1007/s10681-009-9929-0 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest |
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