College of Environmental Science & Engineering, Guilin University of Technology, Guilin, 541004, PR China.
College of Environmental Science & Engineering, Guilin University of Technology, Guilin, 541004, PR China.
Chemosphere. 2022 Nov;306:135500. doi: 10.1016/j.chemosphere.2022.135500. Epub 2022 Jun 29.
Thiocyanate (SCN) is a sulfur-containing pollutant, which is frequently detected in irrigation water and has negative effects on plant growth and crop yields. Uptake and assimilation of exogenous SCN in rice plants was evident, in which two metabolic pathways, carbonyl sulfide (COS) and cyanate (CNO), are activated. Hydrogen sulfide (HS) is an important concomitant derived from detoxification of exogenous SCN in rice plants, which may cause coupling action on the endogenous source of HS from sulfur metabolism. Since HS has dual regulatory effects, the fate of HS derived from assimilation of SCN in plants is critical for clarifying the inclusiveness of HS in various physiological activities. In fact, application of exogenous HS not only positively changed the root phenotype traits of SCN-treated seedlings, but also effectively mitigated the toxic effects of SCN in rice seedlings by stimulating the process of the PSII repair cycle. In this study, it is tempting to analyze and clarify the flux of the concomitant production of HS from assimilation of exogenous SCN into the innate pool, which may function in signaling regulation and other physiological processes in rice plants. This study would update our understanding of the fate of HS derived from assimilation of SCN in plants and provide new insights into the affirmative actions of HS in direct proximity to SCN exposure.
硫氰酸盐（SCN）是一种含硫污染物，常被检测到在灌溉水中，对植物生长和作物产量有负面影响。水稻植株对外源 SCN 的吸收和同化是明显的，其中两种代谢途径，即羰基硫（COS）和异氰酸根（CNO）被激活。硫化氢（HS）是水稻植株中外源 SCN 解毒的重要伴随物，可能对来自硫代谢的内源性 HS 来源产生偶联作用。由于 HS 具有双重调节作用，因此 HS 来源于 SCN 同化的命运对于阐明 HS 在各种生理活动中的包含性至关重要。事实上，外源 HS 的应用不仅积极改变了 SCN 处理幼苗的根表型特征，而且通过刺激 PSII 修复循环过程，有效减轻了 SCN 对水稻幼苗的毒性作用。在本研究中，分析和阐明 HS 从外源 SCN 同化到固有池中的伴随物产生的通量是很有吸引力的，这可能在水稻植株的信号调节和其他生理过程中发挥作用。本研究将更新我们对植物中 SCN 同化产生的 HS 命运的认识，并为 HS 在直接接近 SCN 暴露时的肯定作用提供新的见解。
