Department of Biology, São Paulo State University (UNESP), School of Agricultural and Veterinarian Sciences, Jaboticabal, São Paulo, Brazil.
Agronomy Department, University of Sancti Spiritus 'Jose Marti Perez' (UNISS), Sancti Spiritus, Cuba.
J Sci Food Agric. 2023 Jul;103(9):4360-4370. doi: 10.1002/jsfa.12503. Epub 2023 Mar 6.
Soybean is widely cultivated around the world, including regions with salinity conditions. Salt stress impairs plant physiology and growth, but recent evidence suggests that silicon (Si) is able to mitigate this stressful condition. Therefore, the purpose of this study was to evaluate how different strategies of Si application impact on salt stress tolerance of an intermediate Si accumulator species (soybean). Therefore, we applied four treatments: Si-untreated plants (Si 0); foliar spraying at 20 mmol L (Si F); nutritive solution addition at 2.0 mol L (Si R), and combined foliar spraying at 20 mmol L plus nutritive solution at 2.0 mmol L (Si F + R). We investigated how Si application modified growth, leaf gas exchange, photosynthetic pigments, chlorophyll fluorescence, relative water content (RWC), nutrient accumulation, and ion homeostasis of soybean plants submitted to different levels of salt stress (50 and 100 mmol L NaCl).
Salinity induced an expressive reduction in ion accumulation, plant water status, and growth of soybean, while Si application promoted contrary effects and increased potassium (K ) accumulation, water status, photosynthetic pigment content, chlorophyll fluorescence parameters, and gas exchange attributes. Additionally, Si application enhanced Si accumulation associated with decreased Na uptake and improved morpho-physiological growth.
The use of exogenous Si can be an efficient strategy to attenuate the harmful effects of salt stress in soybean plants. The best application strategy was observed with combined foliar spraying with Si included in the nutritive solution (Si F + R). © 2023 Society of Chemical Industry.
大豆在世界各地广泛种植，包括在盐分条件下的地区。盐胁迫会损害植物的生理和生长，但最近的证据表明，硅（Si）能够缓解这种胁迫条件。因此，本研究的目的是评估不同 Si 施用策略对中间 Si 积累物种（大豆）耐盐性的影响。为此，我们应用了四种处理：未施 Si 植物（Si 0）；20mmol·L -1 叶面喷施（Si F）；2.0mol·L -1 营养液添加（Si R），以及 20mmol·L -1 叶面喷施与 2.0mmol·L -1 营养液添加相结合（Si F+R）。我们研究了 Si 施用如何改变大豆植株在不同盐胁迫水平（50 和 100mmol·L -1 NaCl）下的生长、叶片气体交换、光合色素、叶绿素荧光、相对含水量（RWC）、养分积累和离子稳态。
盐胁迫显著降低了大豆的离子积累、植物水分状况和生长，而 Si 施用则促进了相反的效果，增加了钾（K）积累、水分状况、光合色素含量、叶绿素荧光参数和气体交换特性。此外，Si 施用增强了 Si 积累，同时减少了 Na 吸收，并改善了形态生理生长。
外源 Si 的使用可以是减轻大豆植株盐胁迫有害影响的有效策略。将 Si 叶面喷施与营养液中添加 Si 相结合（Si F+R）的应用策略效果最佳。© 2023 英国化学学会。
