Seed pre-treatment effect on seedling emergence, chlorophyll content and plant weight of dill under salt stress
By: Neda Nikpour-Rashidabad, Kazem Ghassemi-Golezani, Saeideh Alizadeh-Salteh, Mostafa Valizadeh
Key Words: Dill, Plant hormone, Plant weight, Salinity, Seed treatment
J. Bio. Env. Sci. 9(4), 158-164, October 2016.
A factorial experiment with three replications on the bases of randomized complete block design was conducted in 2015 at the Greenhouse of the university of Tabriz, to investigate the effects of different seed pre-treatments (Control, 1 mM GA3 and SA and polymer seed coating) on seedling emergence, chlorophyll content and plant weight of dill (Anethum graveolens L.) under different levels of NaCl salinity (0, 4, 8 and 12 dS/m). Hormonal treatments of seeds significantly improved emergence percentage of dill seedlings under moderate (8 dS/m) and severe (12 dS/m) salinities. Seedling emergence rate of GA3 treated seeds was superior under 0-4 dS/m, but SA treated seeds showed the highest emergence rate under 8-12 dS/m salinities. Seed coating reduced emergence percentage and rate of dill seedlings under all salinity levels. Seed treatment by SA and GA3 improved chlorophylls a and b contents. Whereas, the lowest chlorophyll content was observed in plants from polymer coated seeds. Plants from GA3 treated seeds had the highest plant weight.