EFFECT OF STRATIFICATION DURATION ON SEED GERMINATION OF SEVERAL PEACH LINE ROOTSTOCKS
The 'P.S. A3' and 'P.S. A6' lines showed the maximum germination percentage after 60 days of stratification. 'P.S. B2' gave the best responses after 74 days. The germination percentage in the case of 'Harrow Blood' was lower than the other lines for almost all the stratification period.
As the germination percentage attained the maximum level, the mean germination time remained almost constant (+/- 14 days). A prolonged exposure at 5°C reduced the germination percentage in all the lines. 'P.S. B2' and 'Harrow Blood' showed a secondary response after 103 days of chilling.