The arbuscular mycorrhizal fungus Glomus mosseae alleviates autotoxic effects in maize (Zea mays L.)
The arbuscular mycorrhizal fungus Glomus mosseae alleviates autotoxic effects in maize (Zea mays L.)
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DOI：
10.1016/j.ejsobi.2013.06.004
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发表时间：
2013-09-01
影响因子：
4.2
通讯作者：
Vogel-Mikus, Katarina
中科院分区：
文献类型：
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作者：
Dzafic, Edo;Pongrac, Paula;Vogel-Mikus, Katarina
玉米收获后残留在田间的根残体是水溶性化合物的来源，其可通过自毒作用抑制后续玉米作物的生长。本研究的目的是测试是否形成玉米和丛枝菌根真菌（AMF）之间的共生消除自毒的负面影响。玉米根提取物含有水溶性化合物被用来模拟在实验条件下从土壤中的根残留物分解的自毒化合物的释放，并施加到玉米幼苗的浓度增加。0.15%（w/v）根浸提液处理降低了玉米幼苗根系生物量，提高了愈创木酚过氧化物酶（G-POD）活性和主要水溶性化合物苯并恶嗪酮2，4-二羟基-7-甲氧基-1，4-苯并恶嗪-3-酮（DIMBOA）含量。因此，在随后的接种实验中使用0.15%浓度。玉米根提取物的影响，在非接种的幼苗中看到的AMF接种的玉米丢失，即使AMF的殖民减少根提取物处理的幼苗。这些数据表明，AMF可以减轻玉米根中的水溶性化合物诱导的玉米幼苗的负面影响，并显示AMF在广泛的农业实践中的潜在重要性。(C)2013年Elsevier Masson SAS。All rights reserved.
Maize root residues that remain in the field after harvesting are a source of water-soluble compounds, which can inhibit growth of succeeding maize crops through autotoxicity. The aim of this study was to test whether the formation of symbiosis between maize and arbuscular mycorrhizal fungi (AMF) alleviates negative effects of autotoxicity. Maize root extracts containing water-soluble compounds were used to simulate the release of autotoxic compounds from decomposing root residues in soil under experimental conditions and were applied at increasing concentrations to maize seedlings. The 0.15% (w/v) root extract treatment decreased root biomass and increased guaiacol peroxidase (G-POD) activity and concentrations of the major water-soluble compound benzoxazinone 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) in roots of maize seedlings. As such, 0.15% concentration was used in subsequent inoculation experiment. The effects of maize root extracts seen in non-inoculated seedlings were lost in AMF-inoculated maize, even though the AMF colonization was reduced in the root extract-treated seedlings. These data indicate that AMF can alleviate the negative effects induced in maize seedlings by water-soluble compounds from maize roots and show potential importance of AMF in extensive agricultural practice. (C) 2013 Elsevier Masson SAS. All rights reserved.