Agricultural Chemistry and Bromatology Department, Francisco Tomas y Valiente Street, n 7, Autonoma University 28049, Madrid, Spain.
Plant Physiol Biochem. 2016 Nov;108:132-138. doi: 10.1016/j.plaphy.2016.07.008. Epub 2016 Jul 11.
It is well established the beneficial role of silicon (Si) in alleviating abiotic stress. However, it remains poorly understood the mechanisms of the Si-mediated protection against metal deficiency, especially the zinc (Zn) one. Recently, it has been proposed that Si may act by an interaction with this biometal in the root apoplast contributing to its movement through the plant, as in the case of Fe deficiency. In the present work, the effect of initial or continuous Si doses in soybean Zn deficient plants has been studied. For that purpose, plants grown in hydroponic culture were treated with different Si doses (0.0, 0.5 and 1.0 mM) under Zn limiting conditions. SPAD index in leaves, several growth parameters, mineral content in the whole plant and the formation of Zn pools in roots were determined. An initial addition of 0.5 mM of Si to the nutrient solution led to an enhancement of plants growth, Zn and Si content in leaves, and a higher storage of Zn in the root apoplast. The results suggest that this treatment enhanced Zn accumulation on roots and its movement to shoots when needed, mitigating Zn deficiency symptoms.
硅（Si）在缓解非生物胁迫方面具有有益作用，这一点已得到充分证实。然而，Si 介导的抗金属缺乏（尤其是锌缺乏）的保护机制仍知之甚少，特别是锌缺乏。最近，有人提出 Si 可能通过与根质外体中这种生物金属的相互作用来发挥作用，就像铁缺乏一样，有助于其在植物中的移动。在本工作中，研究了初始或连续 Si 剂量对缺锌大豆植物的影响。为此，在缺锌条件下，用不同 Si 剂量（0.0、0.5 和 1.0 mM）处理水培培养的植物。测定叶片中的 SPAD 指数、几个生长参数、整株的矿物质含量以及根中 Zn 池的形成。向营养液中最初添加 0.5 mM 的 Si 会促进植物生长、叶片中的 Zn 和 Si 含量，并在根质外体中储存更多的 Zn。结果表明，这种处理增强了根对 Zn 的积累及其在需要时向地上部分的转移，从而缓解了 Zn 缺乏症状。
