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Duration of dormancy and methods of determining the germination of dormant seeds of helianthus annuus



Duration of dormancy and methods of determining the germination of dormant seeds of helianthus annuus



Seed Science & Technology 7(2): 179-188



When measured by the mean values over 3 yr this dormancy varied with cultivar from 12-15 days for line LC-2 to 37-40 days for the cultivar 'Record' and line LC-1. The degree of maturity of the seeds also influenced the dormancy duration; seed harvested early with a moisture content of 41-62% broke dormancy after 42-51 days, while seed harvested in the final maturity stage with a moisture content of 8-12% broke dormancy 22-29 days after harvesting. In the methods tested for the determination of the true germination of the dormant seeds, the best results were obtained with low temperature treatment (0.degree. C) alone or in combination with moistening in a GA3 solution; gibberellin treatment alone, shelling the seeds, soaking in 0.2% KNO3, soaking in H2O2 and predrying of seeds all stimulated germination without reaching the level of the true germination. Pretreatment at 3.degree. or 10.degree. C did not stimulate the germination, except for 1 day at 10.degree. C and up to 2 days at 3.degree. C; beyond that the effect was reversed.

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Accession: 005199269

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