Koźmińska Aleksandra, Hanus-Fajerska Ewa, Halecki Wiktor, Ciarkowska Krystyna
Department of Botany, Physiology and Plant Protection, Faculty of Biotechnology and Horticulture, University of Agriculture in Kraków, Al. 29 Listopada 54, 31-425 Kraków, Poland.
Department of Hydrology, Meteorology and Water Management, Warsaw University of Life Sciences, Nowoursynowska Street 166, 02-787 Warsaw, Poland.
Plants (Basel). 2021 Aug 31;10(9):1819. doi: 10.3390/plants10091819.
The growing demand for biomass to produce drugs, cosmetics and spices necessitates the search for innovative methods mitigating the negative effects of environmental stressors in order to improve its yield under unfavorable conditions. Due to the exposure of plants to salinity stress (SS), we investigated the effect of sugar beet molasses (SBM) on the growth and biochemical parameters related to plants' response to SS. Wild thyme plants were treated for 5 weeks to sodium chloride and 3% molasses solution using two modes of application (soil irrigation or foliar sprays). Plants irrigated by SBM showed slighter stem growth inhibition than control plants, high stress tolerance index and maintained a constant root water content under salt stress. Moreover plants treated with 100 mM NaCl and soil-applied SBM had lower lipid peroxidation level, showed lower POD activity, higher total soluble protein content and maintained a more even free amino acids level, compared to the control treatments. The concentration of potassium ions was higher in the case of plant roots irrigation with sugar beet molasses compared to control plants. In this experiment, most of the growth and biochemical parameters from foliar molasses-sprayed plants did not differ significantly from the control. We provided evidence that soil-applied SBM beneficially changed the plant's biochemical response to salt stress. On the basis of the obtained results, we conclude that this soil amendment contributes to the strengthening of plant protection against this harmful environmental factor.
对生物质用于生产药物、化妆品和香料的需求不断增长，这就需要寻找创新方法来减轻环境应激源的负面影响，以便在不利条件下提高其产量。由于植物会受到盐胁迫（SS），我们研究了甜菜糖蜜（SBM）对与植物对盐胁迫反应相关的生长和生化参数的影响。对野生百里香植物使用两种施用方式（土壤灌溉或叶面喷施），用氯化钠和3%的糖蜜溶液处理5周。用SBM灌溉的植物比对照植物茎生长抑制更轻，胁迫耐受指数更高，并且在盐胁迫下保持恒定的根含水量。此外，与对照处理相比，用100 mM氯化钠和土壤施用SBM处理的植物脂质过氧化水平更低，过氧化物酶（POD）活性更低，总可溶性蛋白含量更高，并且游离氨基酸水平更均匀。与对照植物相比，用甜菜糖蜜灌溉植物根系时钾离子浓度更高。在本实验中，叶面喷施糖蜜的植物的大多数生长和生化参数与对照没有显著差异。我们提供了证据表明土壤施用SBM有益地改变了植物对盐胁迫的生化反应。基于所得结果，我们得出结论，这种土壤改良剂有助于增强植物对这种有害环境因素的保护。
