Dormancy of the safflower seeds: effect of storage and pre-chilling

Guilherme Cardoso Oba, André Luís Duarte Goneli, Tathiana Elisa Masetto, Cesar Pedro Hartmann Filho, Vinicius Souza Patricio, Karina Laís Leite Sarath

Abstract


Safflower seeds present dormancy soon after dispersion of the mother-plant, making it impossible to sow newly harvested seeds. Thus, the aim of the present study was to evaluate release dormancy of safflower seeds during storage associated with the use of different periods of pre-chilling. Seeds, with a moisture content of 7.2%, were stored for 0, 60, 120, 180 and 240 days and, after each storage period, were pre-cooled for 0 (control), 1, 2, 3, 4, 5, 6 and 7 days, at 10 ° C and in the absence of light. After pre-chilling, seeds were submitted to the germination test and evaluated for percentage, speed index and average time for protrusion of the primary root, first count and germination. Safflower seeds showed a gradual overcoming of dormancy during storage, becoming practically non-dormant at 240 days. The storage associated with the pre-chilling promoted an increase in seed germination. The pre-chilling for 5 days is efficient to overcome the dormancy of freshly harvested or stored seeds.


Keywords


Carthamus tinctorius L.; physiological dormancy; germination

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