Gailite Agnese, Andersone-Ozola Una, Samsone Ineta, Karlsons Andis, Ievinsh Gederts
Latvian State Forest Research Institute "Silava", 111 Rigas Str., LV-2169 Salaspils, Latvia.
Department of Plant Physiology, Faculty of Biology, University of Latvia, 1 Jelgavas Str., LV-1004 Rīga, Latvia.
Plants (Basel). 2023 Feb 16;12(4):888. doi: 10.3390/plants12040888.
is an endangered plant species typical for wet inland habitats such as calcareous fens. Due to its limited population size and distribution, non-invasive sampling of is important in the research of . The aim of the present study was to assess the effect of mineral nutrient availability and substrate moisture on the growth, physiological status, and mineral nutrition of . The non-destructive measurement of physiological parameters was performed in native habitats during three vegetative seasons, followed by two experiments in controlled conditions. Soil at the two Estonian sites had a relatively larger similarity in the composition of plant-available mineral nutrients in comparison to the two Latvian sites. The chlorophyll fluorescence parameter Performance Index correlated with the total precipitation in the respective month before measurement, but no significant relationship with other environmental variables was found. For mineral nutrient experiments, plants were grown in four substrates with different mineral nutrient composition, resembling that of soil at different sites. Plant growth and physiological indices were significantly affected by the mineral composition of the substrate. Differences in leaf and root mineral nutrient concentrations of plants in part reflected differences in substrate mineral concentration. To evaluate the effect of soil moisture on growth and photosynthesis-associated parameters of , plants were cultivated in "Pope+" substrate at four different moisture treatments (dry, normal, wet, and waterlodged). The most intense growth of plants was evident in waterlodged conditions, which decreased with a decrease in soil moisture. The biomass of leaves increased by 106% and that of the roots increased by 72% as soil moisture increased from dry to normal. For waterlodged plants, leaf biomass increased by 263% and root biomass increased by 566%, in comparison to that for plants cultivated in dry substrate. Substrate drying had a more negative effect on the growth of plants in comparison to that of waterlodging, and this can be directly linked to prevalent hydrological conditions of an alkaline fen habitat native to the species. Therefore, the preservation of the natural water regime in natural habitats is critical to the conservation of the species.
是一种濒危植物物种，是内陆湿地生境（如钙质沼泽）的典型代表。由于其种群规模和分布有限，对其进行非侵入性采样在的研究中很重要。本研究的目的是评估矿质养分有效性和基质水分对的生长、生理状态和矿质营养的影响。在三个生长季节于原生栖息地进行了生理参数的无损测量，随后在受控条件下进行了两项实验。与拉脱维亚的两个地点相比，爱沙尼亚两个地点的土壤在植物可利用矿质养分组成方面具有相对更大的相似性。叶绿素荧光参数性能指数与测量前各月的总降水量相关，但未发现与其他环境变量有显著关系。对于矿质养分实验，将植物种植在四种具有不同矿质养分组成的基质中，类似于不同地点土壤的组成。基质的矿质组成显著影响植物的生长和生理指标。植物叶片和根系矿质养分浓度的差异部分反映了基质矿质浓度的差异。为了评估土壤水分对的生长和光合作用相关参数的影响，将植物种植在“Pope+”基质中，进行四种不同的水分处理（干燥、正常、湿润和水涝）。植物在水涝条件下生长最为旺盛，随着土壤水分的降低而下降。随着土壤水分从干燥增加到正常，叶片生物量增加了106%，根系生物量增加了72%。与种植在干燥基质中的植物相比，水涝植物的叶片生物量增加了263%，根系生物量增加了566%。与水涝相比，基质干燥对植物生长的负面影响更大，这可能直接与该物种原生碱性沼泽栖息地的普遍水文条件有关。因此，在自然栖息地中保持自然水情对该物种的保护至关重要。
