Preharvest And Postharvest Dormancy In Spring Triticale
- D. F. Salmon and
- J. H. Helm2
Susceptibility to sprouting is a major production problem for spring triticale (X Triticosecale Wittmack) grown in areas of Canada with high rainfall during the harvest period. During 1982 and 1983, seven spring triticales and three spring wheats (Triticum aestivum L. em. Thell) were evaluated for preharvest and postharvest dormancy. for the evaluation of preharvest dormancy, primary, secondary, and tertiary spikes were collected 1 week prior to harvest. Seed was germinated for up to 96 h at a temperature of 18 ± 1 °C. Postharvest dormancy was based on seed from random spikes collected at harvest and stored for 3 months on the shelf and in a freezer at approximately 20 and − 20 °C, respectively. Seed from each storage temperature was rated for germination using temperatures of 18 and 30 ± 1 °C for up to 72 h. In both years, primary, secondary, and tertiary spike seed provided similar rankings of lines and cultivars for preharvest sprouting. The sprouting-resistant red seeded wheat line, RL4137 the red seeded utility wheat cultivar Glenlea, and the triticale line 7431A-68E4 showed the most consistent levels of preharvest as well as postharvest dormancy over the 2-yr period. The 30 °C germination temperature identified lines and cultivars with low levels of dormancy not expressed at 18 °C. Regardless of the seed source, collection date, or germination temperature, none of the experimental lines and cultivars approached the dormancy of RL4137.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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