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Performance of tropical forage grass (Brachiaria brizantha) dormant seeds under controlled storage

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Brachiaria brizantha (palisade grass) is a tropical forage grass species showing a high dormancy level in freshly harvested seeds. The main aims of this research work were to analyse the release of seed dormancy under controlled deterioration as well as to estimate viability constants, at moisture contents ranging from 3 to 20% and variable storage periods (from one hour to 1,550 days, at 40, 50 and 65°C). Twelve seed sub samples for each moisture content/temperature combination were sealed in aluminium foil packets and stored in incubators at those temperatures, until completed survival curves were established. Germination tests were performed on intact and scarified (H2SO4, 15') seeds. The hazardous effect of the high storage temperatures seemed to be compensated by greater seed dormancy release, the best results being achieved at 50°C and 40°C for intact and scarified seeds, respectively, not taking into account seed moisture content. Estimated viability constants to predict seed longevity were: K E = 6.488, 8.795; C W = 4.480, 4.852; C H = 0.04750, 0.02114; CQ = 0.001292, 0.000733 for intact and scarified seeds, respectively. The lowest moisture content limit for application of the viability equation at 65°C was 4.9%, unrelated to chemical scarification.
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Document Type: Research Article

Publication date: July 1, 2007

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  • Seed Science and Technology (SST) is one of the leading international journals featuring original papers and review articles on seed quality and physiology as related to seed production, harvest, processing, sampling, storage, distribution and testing. This widely recognised journal is designed to meet the needs of researchers, advisers and all those involved in the improvement and technical control of seed quality.
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