【摘要】 采用种子萌发试验和溶液培养试验方法,比较4种不同改良剂对Cd胁迫下水稻种子萌发和Cd吸收积累的影响。结果表明:添加硼酸、褪黑素、钼酸钠和硅酸钠均可以促进Cd胁迫下水稻种子萌发和水稻幼苗的生长发育。在浓度为5μmol·L^-1的Cd胁迫下,添加1 mg·L^-1硼酸、10μmol·L^-1褪黑素、0.5 mg·L^-1钼酸钠和1 mmol·L^-1硅酸钠使水稻种子发芽率比CK处理分别提高11.1%、10.0%、11.1%和10.0%,发芽势分别提高17.8%、17.8%、17.8%和22.2%;添加这4种改良剂可以不同程度地降低水稻种子萌发和水培实验中水稻植株Cd含量。5μmol·L^-1的Cd胁迫下,添加硼酸、褪黑素、钼酸钠和硅酸钠均显著降低种子萌发试验中水稻幼根和幼芽Cd含量,其中幼根Cd含量降低38.6%～51.3%,幼芽Cd含量降低36.9%～41.1%。水培实验中,当Cd浓度为1μmol·L^-1时,添加硼酸、褪黑素、钼酸钠和硅酸钠使水稻根系Cd含量比对照处理分别降低32.6%、38.3%、47.0%和72.5%（8 d）。硅酸钠降低水稻Cd含量的效果最明显,其次是钼酸钠和褪黑素,硼酸的效果稍差。更多还原

【Abstract】 The effects of four amendments on seed germination and Cd uptake and accumulation in rice under Cd stress were compared by seed germination and solution culture tests. The results showed that the addition of boric acid, melatonin, sodium molybdate, and sodium silicate promoted the germination of rice seeds and growth of rice seedlings under Cd stress. In the 5 μmol·L^-1 Cd concentration treatment group, the addition of 1 mg·L^-1 boric acid, 10 μmol·L^-1 melatonin, 0.5 mg·L^-1 sodium molybdate, and 1 mmol·L^-1 sodium silicate increased rice seed germination rate by 11.1%, 10%, 11.1%, and 10%, respectively, and the germination potential by 17.8%, 17.8%, 17.8%,and 22.2%, respectively, compared with those of the CK. Simultaneously, the addition of these four kinds of amendments reduced Cd concentration in rice in both the seed germination and solution culture tests. When subjected to 5 μmol·L^-1 Cd stress, the addition of boric acid, melatonin, sodium molybdate, and silicic acid significantly decreased Cd concentration in rice roots and shoots. The concentration of Cd in rice roots and shoots decreased by 38.6%～51.3% and 36.9%～41.1% during seed germination, respectively. In the solution culture experiment, under 1 μmol·L^-1 Cd concentration stress, the addition of boric acid, melatonin, molybdate, and sodium silicate reduced the Cd concentration in rice roots by 32.6%, 38.3%, 47%, and 72.5%（8 d）, respectively, compared with that of the control treatment. Moreover, under5 μmol·L^-1 Cd stress, the addition of sodium silicate significantly decreased the Cd translocation from rice root to leaf. The effect of sodium silicate on Cd concentration in rice was the most obvious, followed by sodium molybdate, melatonin, and boric acid.更多还原