镉胁迫对海雀稗脯氨酸、可溶性糖和叶绿素含量及氮、磷、钾吸收的影响

摘要

为了探究海雀稗的耐镉生理基础，通过盆栽试验，研究了不同镉浓度（0 mg／kg、1 mg／kg、10 mg／kg、50 mg／kg、100 mg／kg、200 mg／kg）胁迫下，海雀稗叶绿素、可溶性糖、脯氨酸及氮、磷、钾含量的变化。在镉浓度为100 mg／kg时海雀稗叶片叶绿素含量显著减少，可溶性糖含量明显增加，脯氨酸含量增加不明显，氮、磷积累量减少明显，而钾含量无明显减少。说明，可溶性糖、叶绿素含量的变化可作为评价海雀稗受镉胁迫的重要生理指标；可溶性糖含量和钾积累量保持较高水平有利于增强海雀稗的耐镉性；在利用海雀稗进行镉污染土壤修复治理时应该适当增加氮肥、磷肥的施用。%To study the physiological responses and nutrient accumulations in Paspalum vaginatum Sw. to Cd stress, the changes in the contents of proline, soluble sugar, chlorophyll and the accumulations of nitrogen, phosphorus and potas⁃sium under the stress of Cd (0 mg/kg, 1 mg/kg, 10 mg/kg, 50 mg/kg, 100 mg/kg, 200 mg/kg) were analyzed. In re⁃sponse to Cd stress at 100 mg/kg, chlorophyll content decreased significantly, soluble sugar content increased obviously, and proline content remained a high level, suggesting that soluble sugar content and chlorophyll content could be used as physiological indicators of Cd injury. In response to Cd stress at 100 mg/kg, accumulations of nitrogen and phosphorus re⁃duced, indicating that nitrogen and phosphorus fertilization should be increased during remediation of Cd⁃polluted soil. The high levels of soluble sugar content and potassium accumulation were favorable for improving Cd tolerance of P. vaginatum.