مطالعه تاثیر اسید فولیک (ویتامین B9) بر شاخص‌های جوانه‌زنی گندم نان تحت تنش کادمیوم

Considering that the cadmium concentration in soil and aquatic environments are increasing constantly, for this purpose one experiment conducted in completely randomized design to evaluation effect of folic acid on seed germination parameters under cadmium stress. In this experiment wheat seeds pre-treated for 14 hours in dark condition with Amount of zero (control), 25 and 50 µM of folic acid. Then, seeds dried at room temperature to reach its initial weight, and to induction cadmium stress, cadmium chloride solution used at 2 and 4 mg / l concentrations. Petri dishes containing wheat seeds kept at 24±1°C, 70% relative humidity and darkness condition for 7 days. After this time, germination percentage, germination rate, rootlet and plumule length, root / shoot ratio and seedling dry weight measured. Experiment results showed that Cadmium stress caused to significantly decrease in germination percentage, germination rate, total dry weight and rootlet and plumule length while root / shoot ratio had been increased. But seed priming with folic acid cause to decrease root / shoot ratio, and increased the other parameters listed under cadmium stress. It can be stated that vitamin B9 has effective role in devoting stored carbohydrates to formation of plantlet structure at stress conditions, which can reduce the amount of maintenance respiration and cause to increase growth.