Dūmiņš Kārlis, Andersone-Ozola Una, Samsone Ineta, Elferts Didzis, Ievinsh Gederts
Department of Plant Physiology, Faculty of Biology, University of Latvia, 1 Jelgavas Str., LV-1004 Riga, Latvia.
Department of Botany and Ecology, Faculty of Biology, University of Latvia, 1 Jelgavas Str., LV-1004 Riga, Latvia.
Plants (Basel). 2021 Oct 16;10(10):2196. doi: 10.3390/plants10102196.
The aim of the present study was to analyze the growth and physiological performance of two coexisting species, , and , under the effect of NaCl and rhizobial symbiosis. Seeds of and were collected from populations in the wild, and plants were cultivated in an automated greenhouse, two plants per container. Three basic types of planting were performed: (1) both plants were (single species), (2) one and one (species coexistence), (3) both plants were (single species). For every basic type, three subtypes were made: (1) non-inoculated, (2) inoculated with rhizobia taken from , (3) inoculated with rhizobia taken from . For every subtype, half of the containers were used as control, and half were treated with NaCl. Shoot fresh mass of plants was significantly ( < 0.001) affected by species coexistence, inoculant, and NaCl. Three significant two-way interactions on plant shoot growth were found: between species coexistence and NaCl ( < 0.001), inoculant and species ( < 0.05), and NaCl and species ( < 0.001). A significant three-way interaction between inoculant, NaCl, and species ( < 0.001) indicated different responses of shoot growth of the two species to inoculant type and NaCl. NaCl treatment was an important factor for , resulting in better growth in conditions of species coexistence, but the positive effect of bacterial inoculant was significantly more pronounced. A decrease in peroxidase activity in leaves was a good indicator of relative NaCl tolerance, while the absence/presence of rhizobial inoculation was reflected by changes in leaf chlorophyll concentration and photochemical activity of photosystem II. It can be concluded that interaction between biotic and abiotic factors affected the outcome of the coexistence of the two species. Distribution of in sea-affected habitats seems to be related to a higher competitive ability with allied species at increased substrate salinity, based on better physiological salinity tolerance.
本研究的目的是分析两种共存物种（[物种名称1]和[物种名称2]）在NaCl和根瘤菌共生作用下的生长和生理表现。[物种名称1]和[物种名称2]的种子采自野生种群，植株在自动温室中培养，每个容器种植两株。进行了三种基本种植类型：（1）两株均为[物种名称1]（单一物种），（2）一株[物种名称1]和一株[物种名称2]（物种共存），（3）两株均为[物种名称2]（单一物种）。对于每种基本类型，又分为三个亚型：（1）未接种，（2）接种取自[物种名称1]的根瘤菌，（3）接种取自[物种名称2]的根瘤菌。对于每个亚型，一半的容器用作对照，另一半用NaCl处理。植株地上部鲜质量受到物种共存、接种剂和NaCl的显著影响（P < 0.001）。发现了对植株地上部生长有显著影响的三个双向交互作用：物种共存与NaCl之间（P < 0.001）、接种剂与物种之间（P < 0.05）以及NaCl与物种之间（P < 0.001）。接种剂、NaCl和物种之间的显著三向交互作用（P < 0.001）表明两种物种的地上部生长对接种剂类型和NaCl有不同反应。NaCl处理对[物种名称1]是一个重要因素，在物种共存条件下其生长更好，但细菌接种剂的积极作用更为显著。叶片过氧化物酶活性的降低是相对耐NaCl性的良好指标。而根瘤菌接种与否则通过叶片叶绿素浓度和光系统II的光化学活性的变化来体现。可以得出结论，生物和非生物因素之间的相互作用影响了这两种[物种名称]物种共存的结果。基于更好的生理耐盐性，[物种名称1]在受海洋影响的栖息地中的分布似乎与在底物盐度增加时与相关物种具有更高的竞争能力有关。
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