接种菌根真菌改变辣椒植株脯氨酸代谢和提高对铬的耐受性

M. Ruscitti, M. Arango, M. Ronco, J. Beltrano
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引用次数: 31

摘要

一般来说,重金属会干扰一些生理过程并降低植物的生长。植物自然地与土壤微生物建立共生关系,如菌根真菌。本研究的目的是确定接种菌根真菌是否能通过生长和生化参数以及对辣椒根膜的影响来提高辣椒对铬的耐受性。在不同浓度的铬(K2Cr2O4)存在的土壤条件下,分别接种Glomus mosseae、Glomus intraradices和未接种。无铬生长的辣椒表现为真菌性物种。在最高浓度(200 μM K2Cr2O4)下,Cr可使苔藓藓根定殖率降低23%,使苔藓藓根定殖率降低20%。中、高浓度铬降低了所有生长参数。接种和Cr的交互作用使叶片叶绿素含量和脯氨酸含量增加,而叶片蛋白质和根系脯氨酸含量降低。类胡萝卜素含量不受处理影响。无论接种植株还是未接种植株,高浓度铬均显著增加了根系电解质渗漏。在Cr浓度最高时,接种植株的生物量是未接种植株的2倍。接种植株根系Cr含量显著高于未接种植株。叶片中铬积累量较低,处理间无差异。菌根化提高了辣椒植株对土壤中铬的耐受性,改变了脯氨酸代谢,以确保更有效的响应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Inoculation with mycorrhizal fungi modifies proline metabolism and increases chromium tolerance in pepper plants (Capsicum annuum L.)
In general, heavy metals interfere with several physiological processes and reduce plant growth. Plants naturally establish symbiotic associations with soil microorganisms, such as mycorrhizal fungi. The aim of this research was to determine if inoculation with mycorrhizal fungi increases tolerance to Cr, evidenced by growth and biochemical parameters and the effect on roots membranes in Capsicum annum. Plants were either non-inoculated or inoculated with Glomus mosseae or Glomus intraradices, and grown in the presence of different concentration of Cr (K2Cr2O4) in soil. Pepper plants grown without Cr behaved as mycotrophic species. At the highest concentration (200 μM K2Cr2O4), Cr reduced root colonization by G. mosseae or G. intraradices (to 23 and 20% respectively). Moderate and high concentrations of Cr reduced all growth parameters. The interaction of inoculation and Cr increased leaf chlorophyll and proline content while reduced the leaf protein and root proline content. Carotenoid content was not affected by treatments. High Cr concentrations increased significantly electrolytes leakage in roots, either non-inoculated or inoculated plants. At the highest Cr concentration, inoculated plants had double the biomass of non-inoculated plants. Cr content in roots of inoculated plants was significantly higher than in non-inoculated plants. Chromium accumulation was low in leaves and showed no differences between treatments. Mycorrhization increased pepper plant tolerance to Cr in the soil, modifying proline metabolism to assure a more efficient response.
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