Interaction between boron and aluminum and their effects on phenolic metabolism of Linum usitatissimum L. roots
Interaction between boron and aluminum and their effects on phenolic metabolism of Linum usitatissimum L. roots
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DOI：
10.1016/j.plaphy.2011.09.008
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发表时间：
2011-12-01
影响因子：
6.5
通讯作者：
Fujiwara, Toru
中科院分区：
文献类型：
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作者：
Heidarabadi, Maryam Dahajipour;Ghanati, Faezeh;Fujiwara, Toru
铝毒是酸性土壤（pH < 5.5）中植物生长发育的最重要限制因子。根生长抑制被认为是铝毒的敏感指标，也是缺硼的最佳指示剂。另一方面，细胞壁酚类物质（木质素和酚酸）在胁迫条件下细胞壁伸展性的降低中具有重要作用。因此，硼和铝之间的相互作用对酚类化合物和参与其生物合成的酶的活性在亚麻幼苗进行了研究。将幼苗生长在Hoagland溶液中，并用3个B水平（分别在缺乏、正常和过量条件下4.5、45和450 μ M的H3BO3）和3个Al水平（0、50和100 μ M的AlCl 3中心点6H（2）O）处理。结果表明，铝处理对根中B含量没有影响（铝处理与未处理植株的B含量相同），而B处理，尤其是高浓度的B处理，使根中Al含量较对照降低。此外，最高浓度的B可阻止Al对植物根长的抑制作用。高浓度的B也导致参与酚类化合物的酶活性降低（即，苯丙氨酸解氨酶、多酚氧化酶和过氧化物酶），降低木质素含量和细胞壁结合酚类物质含量，从而减轻铝毒。结果表明，亚麻植物在铝胁迫条件下对B的需求高于在不含铝的正常条件下生长所需的需求。All rights reserved.
Aluminum toxicity is the most important limiting factor for plant growth and development in acidic soils (pH < 5.5). Inhibition of root growth has been considered as a sensitive marker of aluminum toxicity and the best indicator of boron deficiency as well. On the other hand cell wall phenolics (lignin and phenolic acids) have important roles in the reduction of extensibility of cell wall under stress conditions. Therefore, the interaction between boron and aluminum on phenolic compounds and the activity of the enzymes involved in their biosynthesis were investigated in flax seedlings. The seedlings were grown in Hoagland's solution and were treated with 3 B levels (4.5, 45 and 450 mu M of H3BO3 at deficient, normal, and excess conditions, respectively) and 3 Al levels (0, 50 and 100 mu M of AlCl3 center dot 6H(2)O). The results showed that Al treatment did not affect B content of roots (B content of Al-treated and non-treated plants were identical), while B treatment, particularly in higher concentrations, decreased Al content of roots compared with the control plants. In addition, the highest B concentration prevented the inhibitory effect of Al on the root length of plants. High concentrations of B also resulted in the decrease of enzyme activities involved in phenolic compounds (i.e., phenylalanine ammonia-lyase, polyphenol oxidase and peroxidase), decrease of lignin content and wall-bound phenols under Al stress, thereby ameliorating Al toxicity. The results suggest that the requirement of flax plants for B under Al stress conditions is higher than that required for growth in normal conditions without Al. (C) 2011 Elsevier Masson SAS. All rights reserved.