Abstract:

Abstract: [OBJECTIVE] The research aimed to study effect of three kinds of silk fibroin solution (large molecular weight silk fibroin solution, small molecular weight silk fibroin solution, sericin solution) on lettuce seed germination under high temperature stress [METHOD] Taking lettuce Rapid,Jinke, The Emperor, Sundae as test materials, various concentrations of three kinds of silk fibroin solutions soaked for 4h and the control were dipped in water. Then the lettuce seed were germinated illumination box at 35℃ and germination energy, germination rate, vigor index and single plant fresh weight were measured; [RESULTS] The results showed that germination energy, germination rate, vigor index and single plant fresh weight of lettuce seed pretreated with suitable concentration of silk fibroin solution were higher under heat stress than that in control; [CONCLUSION] The silk fibroin solutions have mitigative effect on seed germination under high temperature stress. Through a comprehensive comparison, mitigative effect of 50mg/L large molecular weight silk fibroin solution and 100mg/L small molecular weight silk fibroin solution under the high temperature stress is better than others.