出版社：Thai Society of Higher Eduction Institutes on Environment
摘要：The effect of γ-polyglutamic acid (PGA) produced by Bacillus subtilis on cadmium (Cd)-damaged rice wasinvestigated in experiments with pots containing soil contaminated with Cd at a concentration of 0-200 mg/kg and PGA ata concentration of 0-500 mg/kg. Although Cd reduced the growth and productivity of rice in comparison to the control,the addition of 500 mg/kg of PGA alleviated the effects of Cd toxicity in rice, resulting in increases in shoot and rootlengths, the vigor of the rice and the number of seeds per panicle. Micrographs of ultrathin sections of root cells showed thatthe addition of 500 mg/kg of PGA decreased Cd accumulation in both the epidermis and the intracellular space of cortex,suggesting that PGA reduced Cd transportation into root cells. Based on these results and the metal-binding characteristicsof PGA, it is conceivable that the mechanism by which PGA alleviates Cd toxicity is the extracellular formation ofCd-PGA complexes.
Loading...
