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供铁水平对不同氮源条件下水稻生长和元素吸收 积累的影响及种间差异
张琳, 李光杰, 施卫明
土壤与农业可持续发展国家重点实验室中国科学院南京土壤研究所
摘要:
采用控制条件下的水培试验方法,研究了不同氮源条件下,外源供铁水平对粳稻品种中花11和籼稻品种扬稻6号的苗期生长特征、铵含量和铁、钾离子含量的影响。结果表明:外源铁浓度水平升高会显著缓解铵抑制的粳稻中花11的根系长度,但不缓解铵抑制的籼稻品种扬稻6号根长。外源铁浓度升高处理会显著增加两水稻品种根部铁离子含量,而显著降低两水稻品种铵态氮条件下水稻根部铵离子含量,且两品种间变化趋势相似。高量铵/铁共胁迫条件下,两水稻品种根部钾离子含量均显著降低,且两品种间变化趋势相似。粳稻中花11根系生长明显更耐铁毒害胁迫;硝态氮条件下,籼稻品种扬稻6号根部钾离子变化对铁毒害胁迫更敏感。上述结果显示外源铁浓度水平对根系铵毒害的缓解效果在不同水稻生态型之间存在差异,且这种差异可能与铁胁迫抗性之间存在关联。
关键词:  水稻  氮素形态  铁浓度  根系  生理变化
DOI:10.13758/j.cnki.tr.2019.04.002
分类号:Q945.12
基金项目:国家自然科学基金项目(31430095)、国家重点研发计划项目(2017YFD0200103)和中国科学院南京土壤研究所知识创新工程领域前沿项目(ISSASIP1604 )资助。
Effects of Iron Supply on Biological Characteristics of Different Rice Varieties Under Different Nitrogen Sources
Zhang Lin, Li Guangjie, Shi Weiming
State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science,Chinese Academy of Sciences
Abstract:
Solution culture experiment was carried out to study the effects of different exogenous iron concentrations on seedling growth, contents of ammonium, iron and potassium ions of two rice genotypes – Japonica (Zhonghua 11) and Indica (Yangdao 6th) under different nitrogen sources. Results showed that the increase of exogenous iron level significantly alleviated ammonium inhibition on root growth of Japonica, but no effect on that of Indica. The increase of exogenous iron concentration significantly increased iron contents in roots of two rice varieties, and significantly reduced the contents of ammonium ion in roots of two rice varieties under the condition of ammonium nitrogen, and change trends were similar between the two genotypes. Under the co-stress of ammonium and iron, potassium contents in roots of two genotypes significantly reduced, and the change trends were similar between the two genotypes. Japonica was more resistant to iron toxicity, and the reduction of potassium content in roots of Indica was more sensitive to iron toxicity under nitrate-nitrogen. These results proved that the alleviating effects of increasing exogenous iron concentration on ammonium toxicity of roots in different rice ecotypes were different, possibly associated with the resistance of iron toxicity.
Key words:  Rice  Nitrogenous forms  Iron concentration  Root system  Physiological changes

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