اثر دما و پتانسیل آب (خشکی) بر جوانه‌زنی بذر گیاه دارویی سیاه‌دانه

In order to evaluate the effect of Temperature and drought strees on germination characteristics and seedling growth of Nigella sativa L., an experiment was arranged in a factorial experiment based on completely randomized design with four replications in laboratory of agriculture college of the university of Guilan. In this research, two factors were evaluated: first, two temperature (202c and 25cc) and second, five levels of drought stress (0, -2, -4, -6 and -8 bar). In the end of experiment, were measured germination percentage, germination speed, radicle and shoot length, shoot fresh weight, radicle fresh weight, vigor index, radicle dry weight and shoot dry weight. Results showed when reducing the potential for both surface water temperature, rate and percentage of germination decreased. Also the germination rate showed a faster decline Compared germination percentage. The highest germination rate was at 20 °C of Nigella sativa L. The highest radical weight showed in control and potential -2 bar treatments respectivly at 20 ° C. Also, all the parameters studied in this experiment showed higher reaction temperature of 20 ° C.