EFFECTS OF BENZOIC AND CINNAMIC-ACIDS ON MEMBRANE-PERMEABILITY OF SOYBEAN ROOTS
EFFECTS OF BENZOIC AND CINNAMIC-ACIDS ON MEMBRANE-PERMEABILITY OF SOYBEAN ROOTS
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DOI：
10.1007/bf02027561
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发表时间：
1995-09-01
影响因子：
2.3
通讯作者：
SIMARD, RR
中科院分区：
文献类型：
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作者：
BAZIRAMAKENGA, R;LEROUX, GD;SIMARD, RR
苯甲酸（BEN）和肉桂酸（GIN）在土壤中普遍存在，被认为是强化感物质。已发表的信息表明，BEN和CIN和其他酚酸通过抑制养分吸收而部分地降低植物生长。然而，关于作用机制的研究并没有定论。以大豆为材料，研究了BEN和CIN对大豆细胞膜的影响。CV. Maple Bell）幼苗。用BEN或CIN处理完整的根系迅速增加了电解质渗漏和材料对周围溶液的紫外线吸收。处理12小时后，BEN和CIN降低了根中细胞外巯基的含量。这两种化感物质诱导膜脂过氧化，导致自由基的形成，过氧化氢酶和过氧化物酶活性的抑制，巯基耗尽。质膜巯基的氧化或交联是两种化合物的第一种作用模式。BEN和CIN诱导的大豆养分吸收减少可能是巯基减少导致细胞膜完整性受损的结果，随后是脂质过氧化。
Benzoic (BEN) and cinnamic (GIN) acids are commonly found in soils and are considered as strong allelochemicals. Published information suggest that BEN and CIN and other phenolic acids decrease plant growth in part by suppressing nutrient absorption. However, studies on the mechanism of action were not conclusive. We examined the effects of BEN and CIN on the cell plasma membrane in intact soybean (Glycine max L. cv. Maple Bell) seedlings. Treating intact root systems with BEN or CIN rapidly increased electrolyte leakage and ultraviolet absorption of materials into the surrounding solution. After 12 hr of treatment, BEN and CIN lowered the extracellular sulfhydryl group content in roots. The two allelochemicals induced lipid peroxidation, which resulted from free radical formation in plasma membranes, inhibition of catalase and peroxidase activities, and sulfhydryl group depletion. Oxidation or cross-linking of plasma membrane sulfhydryl groups is the first mode of action of both compounds. The BEN- and CIN-induced decrease in soybean nutrient absorption may be a consequence of damage to cell membrane integrity caused by a decrease in sulfhydryl groups followed by lipid peroxidation.