Effect of Gibberllic Acid, Sulphuric Acid, Thiourea and Potassium Nitrate on Seed Germination and Seedling Growth of C. Sempervirens L. Pyramidalis and C. Sempervirens L. Horizontalis
Keywords:
Seed dormancy, Cupressus seeds, Horizontalis Variety, Pyramidalis VarietyAbstract
As a result of presence of dormancy phenomena in the seeds of the two
species of cupressus trees, C. sempervirens L. Pyramidalis and C. sempervirens
L. Horizontalis which grown well in green mountain area. Because of the
importance of these trees that subjected to extinction in it's natural habitat, like
many other trees grown in the green mountain. This study has been carried out to
investigate the efficiency of using different concentration from the growth
regulator "gibberellic acid", concentrated sulphuric acid and some germination
promotion chemicals like thiourea and potassium nitrate, on breaking of their
seed dormancy and promotion of seedling growth.
The results showed that the highest percentage of seed germination and seedling
development were obtained by treating C. sempervirens L. Horizontalis seeds
with concentrated sulphuric acid for 10 min followed by treatment with 100 ppm
gibberellic acid for 24 hours. While in case of C. sempervirens L. Pyramidalis
seeds, treating with concentrated sulphuric acid for 10 min followed with 50 ppm
of gibberellic acid or with potassium nitrate (0.2 %) for 24 hours showed the
highest percentage of seed germination and maximum development of seedling.
However the concentration 400 ppm of thiourea and gibberellic acid inhibited
germination and development of both variety seedlings significantly in compared with other treatments including untreated seeds. Finally results showed that there
were no significant differences between treatments in calculated mean
germination time for the seeds of all species used.
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