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作 者 ：刘玉国;冯汉青;孙坤*

期 刊 ：植物研究 2011年 31卷 (3)期 页码：293-299

关键词：Al3+；水稻；根生长；

Keywords:aluminum, rice, growth of rice roots,

摘 要 ：铝毒害是酸性土壤限制农作物产量的主要因素之一。本文以水稻为材料，探讨了不同浓度的AlCl₃（0、50、100、150 mmol·L^-1）胁迫处理对水稻幼苗根生长的影响。结果表明，随着Al³⁺浓度和胁迫时间的增加，水稻幼苗根的生长受到抑制，长度和鲜重都减小，根尖细胞死亡的程度增大，根中H₂O₂含量上升；与对照（未经DMTU预处理）相比，经dimethylthiourea（内源过氧化氢抑制剂）预处理的水稻幼苗在Al³⁺胁迫下根细胞死亡程度减小，H₂O₂含量降低,根的生长抑制得到缓解，表明内源H₂O₂的积累是造成Al³⁺对水稻幼苗根生长抑制的原因之一。

Abstract:Aluminum is one of the primary environmental factors that limit crops production in acid soil. In this study, rice roots were respectively exposed to 0, 50, 100 and 150 mmol·L^-1 aluminum stress. The effects of aluminum on the growth of rice root were stuclied. The present results showed that roots growth (root length and fresh weight) of rice decreased with the increase of the concentration of aluminum. The level of cell death of rice root tip and the content of H₂O₂ in rice root increased. Treatment with dimethylthiourea (DMTU, scavenger of H₂O₂) decreased the content of H₂O₂ in rice root. Moreover, DMTU treatments partially alleviated the root cell death and growth inhibition induced by aluminum stress. These results suggested that the effect of aluminum stress on rice root growth could be partly due to the accumulation of H₂O₂ in roots of rice.

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