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采用溶液培养法研究了高 Fe2 +胁迫下不同磷水平对粳稻 Azucena(耐铁毒基因型 )和籼稻 IR6 4 (铁毒敏感基因型 )的生长和生理特性的影响。结果表明 ,与正常供 Fe2 +相比 ,高 Fe2 +胁迫抑制了水稻地上部和根系的生长 ,降低了干物质积累量和叶片叶绿素含量。外源供磷水平的提高 ,水稻地上部和根系生长受铁毒抑制程度有所减弱 ,叶片丙二醛含量和质膜透性下降 ,POD活性和叶绿素含量增加 ,而 SOD活性则有所下降。表明在一定程度上 ,磷营养对提高水稻的耐 Fe2 +毒害具有重要作用 ,而磷对缓解 Azucena的 Fe2 +毒害的效果较为明显
The effects of different levels of phosphorus on the growth and physiological characteristics of japonica rice (Oryza sativa L.) genotypes and indica rice IR6 4 (susceptible genotypes) were studied by solution culture method under high Fe2 + stress. The results showed that high Fe2 + stress inhibited the growth of shoots and roots and decreased the accumulation of dry matter and chlorophyll content in leaves compared with normal Fe2 +. The increase of exogenous phosphorus supply showed that the inhibition of the growth of rice shoots and root system was weakened by iron toxicity, the content of malondialdehyde and the permeability of plasma membrane decreased, the activity of POD and chlorophyll increased, while the activity of SOD decreased. To some extent, phosphorus nutrition plays an important role in increasing the tolerance of rice to Fe2 + toxicity, while phosphorus has more obvious effect on alleviating the Fe2 + toxicity of Azucena