Response to cadmium stress and alleviating effect of putrescine in wheat germination
This study aims to investigate the effects of putrescines on wheat germination and seedling growth under cadmium stress.Nine wheat varieties(lines)were used as experimental materials,and ger-mination experiments with different cadmium concentrations(0,40,80,120,160 and 200 mg·L-1)were carried out to screen suitable cadmium stress concentration and identify cadmium highly sensitive or tol-erant varieties(lines)according to seed germination indexes and seedling growth indexes.Then,the se-lected lines were used as materials to study the effects of different concentrations(0,0.05,0.1,0.2,0.4 and 0.8 mmol·L-1)of putrescine on seed germination and seedling growth of wheat under cadmium stress.The results showed that 80 mg·L-1 cadmium treatment can be used to screen and identify cadmium toler-ance in wheat,Yunmai 399 was a cadmium high sensitive line,and 98-6188 was a cadmium high tolerance line.Under 80 mg·L-1 cadmium stress,the appropriate concentration of putrescine could alleviate the in-hibitory effect of cadmium stress on wheat seed germination and seedling growth,but there were differ-ences among varieties(lines).The results of multi-index comprehensive evaluation and analysis showed that under cadmium stress,0.1-0.2 mmol·L-1(T2-T3)putrescine had a significant effect on seed germi-nation and seedling growth of the two wheat lines,0.4-0.8 mmol·L-1(T4-T5)putrescine had a growth-pro-moting effect on cadmium-tolerant line,but inhibitory effect on cadmium-sensitive line.In summary,under cadmium stress,0.1-0.2 mmol·L-1 putrescine can effectively alleviate the inhibitory effect of cadmium on wheat germination and seedling growth,and improve the cadmium resistance of wheat.This research pro-vides a theoretical reference for the application of putrescine in field production.
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