Role of arbuscular mycorrhizal symbiosis in root mineral uptake under CaCO₃ stress

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• 作者：Sonia Labidi (1)
  Fay莽al Ben Jeddi (1)
  Benoit Tisserant (2)
  Djouher Debiane (2)
  Salah Rezgui (1)
  Anne Grandmougin-Ferjani (2)
  Anissa Loun猫s-Hadj Sahraoui (2) lounes@univ-littoral.fr
• 关键词：CaCO3 – ; Rhizophagus irregularis – ; Arbuscular mycorrhizal symbiosis – ; Mineral uptake – ; Phosphatase
• 刊名：Mycorrhiza
• 出版时间：July 2012
• 出版年：2012
• 期刊代码：185_0940-6360
• 类别：bio
• 卷：22
• 期：5
• 页码：337-345
• 数据来源：sp

摘要

This study investigated the effects of increasing CaCO₃ concentrations (0, 5, 10, 20 mM) on arbuscular mycorrhizal (AM) symbiosis establishment as well as on chicory root growth and mineral nutrient uptake in a monoxenic system. Although CaCO₃ treatments significantly decreased root growth and altered the symbiosis-related development steps of the AM fungus Rhizophagus irregularis (germination, germination hypha elongation, root colonization rate, extraradical hyphal development, sporulation), the fungus was able to completely fulfill its life cycle. Even when root growth decreased more drastically in mycorrhizal roots than in non-mycorrhizal ones in the presence of high CaCO₃ levels, the AM symbiosis was found to be beneficial for root mineral uptake. Significant increases in P, N, Fe, Zn and Cu concentrations were recorded in the mycorrhizal roots. Whereas acid and alkaline phosphatase enzymatic activities remained constant in mycorrhizal roots, they were affected in non-mycorrhizal roots grown in the presence of CaCO₃ when compared with the control.