UWA School of Agriculture and Environment, The University of Western Australia (UWA), Crawley, Australia.
Department of Soil Science, Bangladesh Agricultural University, Mymensingh, Bangladesh.
J Sci Food Agric. 2021 Aug 30;101(11):4643-4652. doi: 10.1002/jsfa.11107. Epub 2021 Feb 12.
Soil acidity causes an increase in the solubility of toxic aluminium (Al), inhibiting root growth and limiting plant access to soil water and nutrients. Toxicity of Al decreases growth and development more in Al-sensitive than Al-resistant wheat (Triticum aestivum L.) genotypes. Applying magnesium (Mg) may alleviate Al toxicity in acidic soil. It is unclear if growing Al-resistant wheat, coupled with Mg application, will enhance wheat growth and physiological responses in acidic soil. Wheat was grown in the reconstituted acidic soil profile in a three-factor glasshouse experiment comprising foliar Mg at [Mg] = 0 and 200 mg L (using magnesium sulfate), wheat genotypes ES8 (Al sensitive) and ET8 (Al resistant), and four soil treatments [non-amended soil (pH 4.0); 100% of the recommended lime dose in subsoil to raise pH to 6.0; or 20 mg Mg kg soil to the whole soil profile (as magnesium sulfate or magnesium chloride)].
Applying foliar Mg to Al-resistant wheat significantly increased shoot dry weight (24%), subsoil root dry weight (12%), subsoil coarse (>0.2 mm in diameter) root length (12%), net photosynthetic rate (28%), and total leaf area (10%) compared with plants not treated with foliar Mg. Combining foliar Mg application with subsoil liming increased the subsoil total root length by 1.3-fold compared with zero foliar Mg. Without foliar Mg, subsoil liming and soil Mg amendment significantly (by 10%) enhanced shoot growth and total leaf area compared with non-amended soil.
Growing an Al-resistant genotype coupled with applying Mg foliarly and to soil improved wheat growth in an acidic soil. © 2021 Society of Chemical Industry.
土壤酸度会增加有毒铝（Al）的溶解度，抑制根系生长，并限制植物对土壤水分和养分的吸收。在酸性土壤中，Al 对 Al 敏感型小麦（Triticum aestivum L.）基因型的生长和发育的抑制作用比对 Al 耐性型小麦的抑制作用更大。施用镁（Mg）可能会减轻酸性土壤中的 Al 毒性。目前尚不清楚在酸性土壤中种植 Al 耐性型小麦并施加 Mg 是否会增强小麦的生长和生理响应。在一个包含三因子温室实验的再构成酸性土壤剖面中种植小麦，该实验包含叶面施用 Mg（[Mg] = 0 和 200 mg·L-1，使用硫酸镁）、小麦基因型 ES8（Al 敏感型）和 ET8（Al 耐性型）以及四种土壤处理[未施肥土壤（pH 4.0）；向亚表层施入推荐用量的石灰以使 pH 升至 6.0；或向整个土壤剖面施入 20 mg·Mg·kg-1土壤的 Mg（以硫酸镁或氯化镁的形式）]。
与未叶面施 Mg 的植株相比，向 Al 耐性型小麦叶面施 Mg 可使地上部干重（24%）、亚表层根系干重（12%）、亚表层粗根（直径 >0.2 mm）长度（12%）、净光合速率（28%）和总叶面积（10%）显著增加。与不叶面施 Mg 相比，叶面施 Mg 与亚表层施石灰结合可使亚表层总根长增加 1.3 倍。不叶面施 Mg 时，亚表层施石灰和土壤施 Mg 显著（提高 10%）增强了地上部生长和总叶面积。
种植 Al 耐性型基因型并叶面和土壤施加 Mg 可改善小麦在酸性土壤中的生长。© 2021 英国化学学会。
