Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164, USA.
Department of Tropical Plant and Soil Sciences, University of Hawai'i at Mānoa, Honolulu, HI 96822, USA.
Biomolecules. 2021 Jul 23;11(8):1085. doi: 10.3390/biom11081085.
Global agricultural intensification has prompted investigations into biostimulants to enhance plant nutrition and soil ecosystem processes. Metal lactates are an understudied class of organic micronutrient supplement that provide both a labile carbon source and mineral nutrition for plant and microbial growth. To gain a fundamental understanding of plant responses to metal lactates, we employed a series of sterile culture-vessel experiments to compare the uptake and toxicity of five metals (Zn, Mn, Cu, Ni, and Co) supplied in lactate and chloride salt form. Additionally, primary root growth in plate-grown seedlings was used to determine optimal concentrations of each metal lactate. Our results suggest that uptake and utilization of metals in wheat ( L.) when supplied in lactate form is comparable to that of metal chlorides. Metal lactates also have promotional growth effects on seedlings with optimal concentrations identified for Zn (0.5-1.0 µM), Mn (0.5-1.0 µM), Cu (0.5 µM), Ni (1.0 µM), and Co (0.5 µM) lactate. These findings present foundational evidence to support the use of metal lactates as potential crop biostimulants due to their ability to both supply nutrients and stimulate plant growth.
全球农业集约化促使人们研究生物刺激素，以提高植物营养和土壤生态系统过程。金属乳酸盐是一类研究较少的有机微量营养素补充剂，可为植物和微生物生长提供可利用的碳源和矿物质营养。为了深入了解植物对金属乳酸盐的反应，我们进行了一系列无菌培养容器实验，比较了以乳酸盐和氯化物盐形式提供的五种金属（Zn、Mn、Cu、Ni 和 Co）的吸收和毒性。此外，还利用平板培养的幼苗的主根生长来确定每种金属乳酸盐的最佳浓度。我们的结果表明，当以乳酸盐形式提供时，小麦（ L.）对金属的吸收和利用与金属氯化物相当。金属乳酸盐对 幼苗也有促进生长的作用，确定了 Zn（0.5-1.0 µM）、Mn（0.5-1.0 µM）、Cu（0.5 µM）、Ni（1.0 µM）和 Co（0.5 µM）乳酸盐的最佳浓度。这些发现为金属乳酸盐作为潜在作物生物刺激剂的使用提供了基础证据，因为它们既能提供养分又能刺激植物生长。
