Assessment of effective factors on breaking seed dormancy in Prunus dulcis (Mill.) D.A. Webb

Z. Rafiei, V. Rouhi, S. Houshmand, A. Mohamadkhani
Prunus dulcis is one of the most resistant trees of mountain and dry areas. It may produce significant yield in low nutrition but high influence lands. This tree is dispersed in vast areas of Iran. Seed dormancy occurs naturally in Prunus species to protect their seeds from cold winters. Seed dormancy in these species makes it difficult to use them as genotype reserves, as stock for other species and to evaluate the strength of seed germination. External shell of almond seeds causes physical dormancy, and dormancy of seed embryo (because of hormonal imbalance) leads to physiological dormancy. Scarification and stratification are two common methods used to overcome physical and physiological dormancy of almond seeds, respectively. The aim of this research was to break seed dormancy in Prunus dulcis seeds and to study scarification and the lack of scarification, stratification time intervals (45, 90, and 135 days) and seed ecotypes (‘Najafabad’ and ‘Tirankarvan’) on percent of germination, and length of seedlings. The research was performed in a factorial design with a completely randomized base design and three replicates. The results of this study showed scarification in the different seed ecotypes will have positive and significant effects (P<0.01) on a percentage of seed germination and seedling length and determining the optimum stratification time interval (135 days) will significantly affect the seedling length. It should be noted that selecting the appropriate genotype (‘Tirankarvan’) will significantly (P<0.01) affect the success of seed germination and seedling growth.
Rafiei, Z., Rouhi, V., Houshmand, S. and Mohamadkhani, A. (2019). Assessment of effective factors on breaking seed dormancy in Prunus dulcis (Mill.) D.A. Webb. Acta Hortic. 1249, 167-174
DOI: 10.17660/ActaHortic.2019.1249.31
abscisic acid, dormancy, gibberellic acid, germination

Acta Horticulturae