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首页> 美国卫生研究院文献>Plant Physiology >Changes in Isozyme Profiles of Catalase Peroxidase and Glutathione Reductase during Acclimation to Chilling in Mesocotyls of Maize Seedlings.
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Changes in Isozyme Profiles of Catalase Peroxidase and Glutathione Reductase during Acclimation to Chilling in Mesocotyls of Maize Seedlings.

机译：玉米幼苗中胚轴适应低温后过氧化氢酶过氧化物酶和谷胱甘肽还原酶同工酶谱的变化

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摘要

The response of antioxidants to acclimation and chilling in various tissues of dark-grown maize (Zea mays L.) seedlings was examined in relation to chilling tolerance and protection from chilling-induced oxidative stress. Chilling caused an accumulation of H2O2 in both the coleoptile + leaf and the mesocotyl (but not roots), and acclimation prevented this accumulation. None of the antioxidant enzymes were significantly affected by acclimation or chilling in the coleoptile + leaf or root. However, elevated levels of glutathione in acclimated seedlings may contribute to an enhanced ability to scavenge H2O2 in the coleoptile + leaf. In the mesocotyl (visibly most susceptible to chilling), catalase3 was elevated in acclimated seedlings and may represent the first line of defense from mitochondria-generated H2O2. Nine of the most prominent peroxidase isozymes were induced by acclimation, two of which were located in the cell wall, suggesting a role in lignification. Lignin content was elevated in mesocotyls of acclimated seedlings, likely improving the mechanical strength of the mesocotyl. One cytosolic glutathione reductase isozyme was greatly decreased in acclimated seedlings, whereas two others were elevated, possibly resulting in improved effectiveness of the enzyme at low temperature. When taken together, these responses to acclimation illustrate the potential ways in which chilling tolerance may be improved in preemergent maize seedlings.
机译：研究了抗氧化剂对深色玉米（Zea mays L.）幼苗各种组织中适应和低温的响应，涉及耐低温性和对低温诱导的氧化胁迫的保护作用。变冷导致胚芽鞘+叶片和中胚轴（但不是根）中H2O2的积累，而驯化阻止了这种积累。胚芽鞘+叶或根中的驯化或冷害均不会对抗氧化酶产生显着影响。但是，适应环境中的幼苗中谷胱甘肽水平升高可能有助于提高胚芽鞘+叶片中H2O2的清除能力。在中胚轴（显然最容易受冷）中，过氧化氢酶3在适应的幼苗中升高，可能代表线粒体产生的H2O2的第一道防线。驯化诱导了9个最主要的过氧化物酶同工酶，其中两个位于细胞壁，提示其在木质化中的作用。适应幼苗的中胚轴中木质素含量升高，可能会提高中胚轴的机械强度。在适应的幼苗中，一种胞质谷胱甘肽还原酶同工酶大大降低，而其他两种升高，可能导致该酶在低温下的有效性提高。综上所述，这些对驯化的反应说明了潜在的方式可以提高发芽前玉米幼苗的耐冷性。

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