地衣共生体对沙漠盐碱压力的适应更多地取决于它们的共生藻。

IF 5.4 2区 生物学 Q1 PLANT SCIENCES
Biting Li, Reyim Mamuti, Liting Xiao, Ben Qian, Yanyan Wang, Xinli Wei
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引用次数: 0

摘要

土壤盐碱化是整个陆地生态系统面临的主要环境威胁。地衣是由真菌和藻类或蓝藻共生产生的。它们对各种极端环境具有很强的耐受性,包括对盐碱地生境的适应性。因此,地衣是盐碱地上的先锋物种。然而,人们对这两种共生伙伴在盐碱条件下各自的恢复能力仍缺乏足够的了解。本研究通过调节不同浓度的 NaHCO3,研究了两种具有代表性的共生藻类 Diplosphaera chodatii 和 Trebouxia jamesii 以及它们各自的共生真菌 Endocarpon pusillum(三叶地衣)和 Umbilicaria muhlenbergii(半三叶地衣)对盐碱胁迫的生理反应。结果表明,在碱性-碱性基质中,四种培养物的细胞生长率和生物量都有所下降,而细胞活性和超微结构则受到不同程度的影响。与共生真菌相比,盐碱胁迫下藻类在协调氧化应激和脂质过氧化损伤方面更为活跃。藻类的抗氧化系统尤其被证明是一种关键的适应性特征,它为物种在干旱的盐碱荒漠中生存和存活提供了重要策略。地衣共生的特殊生存能力依赖于共生伙伴共同的抗逆优势。我们的研究为了解地衣共生对沙漠盐碱土壤的适应性以及地衣共生藻在未来沙漠生态恢复中的潜力提供了新的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The adaptation of lichen symbiosis to desert saline-alkali stress depends more on their symbiotic algae.

Soil salinization is a major environmental threat to the entire terrestrial ecosystem. Lichens arose from the symbiosis of fungi and algae or cyanobacteria. They have a high tolerance to various extreme environments, including adaptation to saline-alkali habitats. Thus, lichens are pioneer species on saline-alkali soil. However, the separate resilience of the two symbiotic partners under saline-alkali conditions remains insufficiently understood. In this study, two representative symbiotic algae, Diplosphaera chodatii and Trebouxia jamesii, were studied for their physiological response to the saline-alkali stress by adjusting different concentrations of NaHCO3, together with their respective symbiotic fungi Endocarpon pusillum (terricolous lichen) and Umbilicaria muhlenbergii (saxicolous lichen). The results indicate that cell growth rate and biomass in all four cultures decreased in alkali-alkaline substrate, while cellular activities and ultrastructure were affected to a distinct extent. Compared with the symbiotic fungi, the algae were found to be more active in coordinating oxidative stress and lipid peroxidation damage under the saline-alkali stress. The antioxidant system of the alga was especially shown as a key adaptive trait and it provides an important strategy for species survival and persistence in arid saline-alkali desert. The specific survival ability of the lichen symbiosis relies on the stress resilience advantages of the symbiotic partners in combination. Our study provided new insights into understanding the adaptation of lichen symbiosis to desert saline-alkali soil, and the potential of lichen symbiotic algae in the future desert ecological restoration.

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来源期刊
Physiologia plantarum
Physiologia plantarum 生物-植物科学
CiteScore
11.00
自引率
3.10%
发文量
224
审稿时长
3.9 months
期刊介绍: Physiologia Plantarum is an international journal committed to publishing the best full-length original research papers that advance our understanding of primary mechanisms of plant development, growth and productivity as well as plant interactions with the biotic and abiotic environment. All organisational levels of experimental plant biology – from molecular and cell biology, biochemistry and biophysics to ecophysiology and global change biology – fall within the scope of the journal. The content is distributed between 5 main subject areas supervised by Subject Editors specialised in the respective domain: (1) biochemistry and metabolism, (2) ecophysiology, stress and adaptation, (3) uptake, transport and assimilation, (4) development, growth and differentiation, (5) photobiology and photosynthesis.
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