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Grain dormancy in fixed lines of white-grained wheat (Triticum aestivum L.) grown under controlled environmental conditions

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Hickey, L. T., Dieters, M. J., DeLacy, I. H., Kravchuk, O. Y., Mares, D. J. and Banks, P. M. (2009) Grain dormancy in fixed lines of white-grained wheat (Triticum aestivum L.) grown under controlled environmental conditions. Euphytica, 168 (3). pp. 303-310.

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Article Link: https://doi.org/10.1007/s10681-009-9929-0


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.

Item Type:Article
Business groups:Crop and Food Science
Keywords:Controlled temperature glasshouse Extended photoperiod Germination index Germination response Phenotypic screen Pre-harvest sprouting Wheat breeding
Subjects:Agriculture > Agriculture (General) > Agricultural meteorology. Crops and climate
Agriculture > Agriculture (General) > Methods and systems of culture. Cropping systems
Plant culture > Field crops > Grain. Cereals
Plant culture > Field crops > Wheat
Live Archive:17 Feb 2022 03:58
Last Modified:17 Feb 2022 03:58

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