Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300350, China.
Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300350, China.
Ecotoxicol Environ Saf. 2018 Aug 15;157:395-402. doi: 10.1016/j.ecoenv.2018.03.061. Epub 2018 Apr 10.
Boron toxicity is a worldwide problem, usually accompanied by salt (NaCl) and drought. The combined stresses may induce complex toxicity to the plant. The aim of the present study was to investigate how the combined stresses of salt and drought affect B toxicity in plants. Puccinellia tenuiflora seedlings were planted in vermiculite. A three (B) × three (salt) × three (drought) factorial experiment (for a total of 27 treatments) was conducted. After a 30-day cultivation, plants were harvested to determine dry weight and the concentrations of B, Na, K, Ca, and Mg. Plant growth was inhibited by B toxicity, which was alleviated by salt and drought. B stress enhanced B uptake and transport of the plant, which was inhibited by salt and drought. B stress had a little effect on K and Na concentration and caused Ca and Mg accumulation in the plant. Salt addition increased Na concentration and inhibited Ca and Mg accumulation. Drought addition inhibited Na accumulation and enhanced Ca and Mg accumulation. The combined stresses of salt and drought had a greater alleviation on the inhibition of dry weight caused by B than individual salt and drought. Besides, the combined stresses of salt and drought also enhanced B uptake and inhibited B transport. The results indicate that salt, drought, and the combined stresses of salt and drought all can alleviate B toxicity in P. tenuiflora, the main mechanism of which is the restriction of B and Na uptake caused by salt and drought. The combined stresses of salt and drought have a greater effect on B toxicity than individual salt and drought.
硼中毒是一个全球性的问题，通常伴随着盐分（NaCl）和干旱。这些复合胁迫可能会对植物产生复杂的毒性。本研究旨在探讨盐分和干旱复合胁迫对植物硼毒性的影响。将星星草幼苗种植在蛭石中。采用三因素（B）×三因素（盐）×三因素（干旱）析因实验（共 27 种处理）。经过 30 天的培养后，收获植物以确定干重和 B、Na、K、Ca 和 Mg 的浓度。硼毒性抑制了植物的生长，盐分和干旱缓解了硼毒性的抑制作用。硼胁迫增强了植物对 B 的吸收和转运，而盐分和干旱则抑制了这一过程。硼胁迫对 K 和 Na 浓度的影响较小，导致 Ca 和 Mg 在植物中积累。盐分的添加增加了 Na 浓度，抑制了 Ca 和 Mg 的积累。干旱的添加抑制了 Na 的积累，促进了 Ca 和 Mg 的积累。盐分和干旱的复合胁迫对硼抑制干重的缓解作用大于单一的盐分和干旱。此外，盐分和干旱的复合胁迫还增强了 B 的吸收并抑制了 B 的转运。研究结果表明，盐分、干旱以及盐分和干旱的复合胁迫都能缓解星星草的硼中毒，其主要机制是盐分和干旱对 B 和 Na 吸收的限制。盐分和干旱的复合胁迫对硼毒性的影响大于单一的盐分和干旱。
