Antioxidant defenses against air humidity stress in fruit body of Auricularia heimuer

IF 1.4 4区 生物学 Q4 MYCOLOGY International journal of medicinal mushrooms Pub Date : 2024-02-01 DOI:10.1615/intjmedmushrooms.2024052879
Huai Liang Ma, Shi Yu Ma, Chen Xi Fu, Jia Qi Yang, Dan Lin Li
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Abstract

Air humidity is an important environmental factor restricting the fruit body growth of Auricularia heimuer. Low air humidity causes the fruit body to desiccate and enter dormancy. However, the survival mechanisms to low air humidity for fruit bodies before dormancy remain poorly understood. In the present study, we cultivated A. heimuer in a greenhouse and collected the fruit bodies at different air humidities (90%, 80%, 70%, 60%, and 50%) to determine the contents of malondialdehyde (MDA) and non-enzymatic antioxidants such as ascorbic acid (AsA) and glutathione (GSH); and the activities of enzymatic antioxidants including superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), glutathione peroxidase (GPX) and glutathione reductase (GR). Results showed that the MDA contents had a tendency to increase with decreasing relative air humidity. Relative air humidity below 90% caused membrane lipid peroxidation and oxidative stress (based on MDA contents) to the fruit body, which we named air humidity stress. In contrast to the control and with the degree of stress, the GSH contents and activities of SOD, CAT, GR, GPX, and APX tended to ascend, whereas AsA showed a declining trend; the POD activity only rose at 50%. The antioxidants favored the fruit body to alleviate oxidative damage and strengthened its tolerance to air humidity stress. The antioxidant defense system could be an important mechanism for the fruit body of A. heimuer in air humidity stress.
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黑木耳果实体内对抗空气湿度胁迫的抗氧化防御系统
空气湿度是限制黑木耳果体生长的一个重要环境因素。低空气湿度会导致果体干燥并进入休眠期。然而,人们对休眠前果体在低空气湿度下的存活机制仍然知之甚少。在本研究中,我们在温室中培育了 A.heimuer,并在不同空气湿度(90%、80%、70%、60%和 50%)下采集果体,测定丙二醛(MDA)含量、抗坏血酸(AsA)和谷胱甘肽(GSH)等非酶抗氧化剂的含量以及酶抗氧化剂的活性;以及酶抗氧化剂的活性,包括超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)、谷胱甘肽过氧化物酶(GPX)和谷胱甘肽还原酶(GR)。结果表明,随着相对空气湿度的降低,MDA 含量呈上升趋势。相对空气湿度低于 90% 会导致膜脂过氧化和果体氧化胁迫(基于 MDA 含量),我们将其命名为空气湿度胁迫。与对照组相比,随着胁迫程度的增加,GSH 含量和 SOD、CAT、GR、GPX 和 APX 的活性呈上升趋势,而 AsA 则呈下降趋势;POD 活性仅在 50% 时才上升。抗氧化剂有利于果体减轻氧化损伤,增强其对空气湿度胁迫的耐受性。抗氧化防御系统可能是海橘红果实在空气湿度胁迫下的一个重要机制。
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来源期刊
CiteScore
2.60
自引率
16.70%
发文量
91
审稿时长
6-12 weeks
期刊介绍: The rapid growth of interest in medicinal mushrooms research is matched by the large number of disparate groups that currently publish in a wide range of publications. The International Journal of Medicinal Mushrooms is the one source of information that will draw together all aspects of this exciting and expanding field - a source that will keep you up to date with the latest issues and practice. The International Journal of Medicinal Mushrooms published original research articles and critical reviews on a broad range of subjects pertaining to medicinal mushrooms, including systematics, nomenclature, taxonomy, morphology, medicinal value, biotechnology, and much more.
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