SORBUS SIBIRICA SEEDS DORMANCY AND GERMINATION DEPENDING ON STORAGE CONDITIONS AND PHYTOHORMONES

Three variants of mountain ash (Sorbus sibirica Hedl.) seeds storage have been studied: air-dry seeds at room temperature; air-dry seeds in the thermostat at 1–3oC; and seeds dried up to 25% moisture in the thermostat at 1–3oC. The part of the seeds from each category was treated with phytohormones, gibberellic acid and kinetin solutions, the control seeds with distilled water. The freshly isolated (non-dried) seeds were used in the variants without storage. Continuous stratification at 1–3oC in the laboratory was used for seed germination. The seeds were germinated at 25oC in the intervals of 45, 75, and 105 days in cold stratification with the number of germinated seeds to be counted. It has been found that during the first 45 days of dry storage the seeds stopped responding positively to the treatment with phytohormones but showed the positive response to cold stratification. At further dry storage, sensitivity of seeds to phytohormones was gradually recovering but the reaction to cold stratification did not change. The freshly isolated (not dried) S. sibirica seeds treated with phytohormones have shown the highest percentage of germination of 87% with 105 days of stratification. To keep high sensitivity of S. sibirica seeds to phytohormones, they need to be stored moistened to 25% water content at 1–3oC. Under these conditions, the seeds were observed to show gradually increased sensitivity to cold stratification and reduced sensitivity to phytohormones. Storing seeds in these conditions for more than a year reduces sensitivity to phytohormones and cold stratification.

mountain ash, Sorbus sibirica, stratification, phytohormones, seeds storage, seed dormancy, seed germination

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