影响菜豆体内铁再利用效率的因素及其机理
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* 国家攀登计划;国家自然科学基金


FACTORS AFFECTING REUTILIZATION EFFICIENCY OF IRON IN BEAN PLANTS AND THEIR MECHANISM
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    摘要:

    本文在人工气候室中,用营养液培养方法,并结合同位素示踪技术研究了铁的供应状况、两种形态氮素(NO3--N和NH4+-N)及叶片遮光对菜豆体内铁再利用效率的影响,并对其有关机理进行了深入的研究。结果表明,铁的缺乏有利于累积在根和初生叶中的铁向新生组织中转移,铁的再利用效率明显提高。无论在缺铁还是供铁条件下,NH4+-N的供应使得菜豆新叶中活性铁含量、新叶叶绿素含量及体内铁的再利用效率都明显高于NO3--N处理,叶绿体超微结构完整,井且新叶未出现黄化现象;特别是在处理后期,差异更加明显。初生叶遮光使得新叶中活性铁含量增加,体内铁的再利用效率提高了6个百分点左右,在一定程度上改善了NO3--N营养缺铁菜豆新叶的铁营养状况。可见,NH4+-N的供应和叶片遮光都可提高菜豆体内铁的再利用效率,明显改善菜豆新叶的铁营养状况。

    Abstract:

    The effects of iron supply, nitrogen forms (N03-N and NH4+-N) and primary-leaves-shading on reutilization efficiency of Fe in bean plants and their mechanism were studied in nutrient solutions under controlled conditions. The 59 Fe isotopic method was also used to identify the iron reutilization efficiency. The results showed that Fe deficiency could enhance Fe translocation to young leaves from roots and primary-leaves, thus increasing Fe reutilization efficiency. The plants added with NH4+-N had a much higher content of active Fe, more chlorophyll in young leaves and high Fe reutilization efficiency, much better ultrastructure chloroplast than those fed with N03-N, and these were true both in Fe-sufficient and deficient treatments. No chlorosis occurred in young leaves of bean plants fed with NH4+-N under Fe-deficient condition. More active Fe and 6 percent enhancement in Fe reutilization efficiency were found in the primary-leaves-shading treatment, which improved Fe nutrition in young leaves of Fe-deficient plants fed with N03-N. All these results demonstrated that both NH4+-N and primary-leaves-shading had a beneficial effect on mcreasing Fe reutilization efficiency, improving Fe nutrition in young leaves and depressing chlorosis symptom in bean plants.

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邹春琴,张福锁,毛达如.影响菜豆体内铁再利用效率的因素及其机理[J].土壤学报,1997,34(4):451-460. Zou Chunqin, Zhang Fusuo, Mao Daru. FACTORS AFFECTING REUTILIZATION EFFICIENCY OF IRON IN BEAN PLANTS AND THEIR MECHANISM[J]. Acta Pedologica Sinica,1997,34(4):451-460.

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  • 收稿日期:1996-03-20
  • 最后修改日期:1996-05-12
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  • 在线发布日期: 2013-02-25
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