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- Title
Grain dormancy in fixed lines of white-grained wheat ( Triticum aestivum L.) grown under controlled environmental conditions.
- Authors
Hickey, Lee; Dieters, Mark; DeLacy, Ian; Kravchuk, Olena; Mares, Daryl; Banks, Phillip
- 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 non-dormant 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.
- Subjects
WHEAT; DORMANCY (Biology); PREHARVEST sprouting of corn; PLANT embryology; GENOTYPE-environment interaction
- Publication
Euphytica, 2009, Vol 168, Issue 3, p303
- ISSN
0014-2336
- Publication type
Article
- DOI
10.1007/s10681-009-9929-0