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首页> 外文期刊>Ecological research >Oxidative metabolism-related changes during germination of mono maple (Acer mono Maxim.) seeds under seasonal frozen soil
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Oxidative metabolism-related changes during germination of mono maple (Acer mono Maxim.) seeds under seasonal frozen soil

机译：季节性冻土下单槭种子发芽过程中与氧化代谢相关的变化

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摘要

The influence of seasonal frozen soil and buried depth on germination of mono maple (Acer mono Maxim.) seeds was studied in field conditions in winter in a sub-alpine region. Mono maple seeds almost lost their ability to germinate in non-freezing soil, while seasonal frozen soil treatments facilitated the germination accompanied with a progressive accumulation of reactive oxygen species (ROS). The result indicates that ROS may act as a positive signal for seed dormancy. However, exceeding accumulation of ROS led to decrease in germination rate. We suggest that the shift from a signaling to a deleterious role may be related to the accumulation of these ROS above a threshold level that leads to various cellular alterations and damage. The enhanced activities of antioxidant enzymes appear to be more closely related to freezing tolerance, because of their ability to scavenge ROS to avoid deleterious events. Seasonal frozen soil was beneficial in accelerating the germination of mono maple seeds. However, a slight increase of freezing temperature may have also facilitated the germination of mono maple seeds by enhanced activities of antioxidant enzymes. Hence, moderate winter warming may be beneficial to mono maple regeneration due to the improvement of seed germination, but the disappearance of seasonal frozen soil may lead to germination failure of the mono maple seeds.
机译：在冬季的亚高山地区，在田间条件下研究了季节性冻土和埋藏深度对单槭（Acer mono Maxim。）种子萌发的影响。单枫树种子几乎失去了在非冻结土壤中发芽的能力，而季节性的冻土处理则促进了发芽，并伴随着活性氧（ROS）的逐步积累。结果表明ROS可能是种子休眠的正信号。但是，ROS的累积过多导致发芽率降低。我们建议从信号转为有害的作用可能与这些ROS在阈值水平以上的积累有关，从而导致各种细胞改变和损伤。抗氧化酶的活性增强似乎与抗冻性密切相关，因为它们具有清除ROS以避免有害事件的能力。季节性冻土有助于加速单枫种子的发芽。但是，冷冻温度的轻微升高也可能通过增强抗氧化酶的活性而促进了单槭种子的发芽。因此，由于种子发芽的改善，适度的冬季变暖可能有利于单枫树的再生，但是季节性冻土的消失可能导致单枫树种子的发芽失败。

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  • 来源
    《Ecological research》 |2010年第2期|p.337-345|共9页
  • 作者

    Jihong Qin; rnQing Liu;

  • 作者单位

    College of Rural and Urban Construction, Chengdu University, 610106 Chengdu, People's Republic of China Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9 Section 4, Renmin Nan Road, P.O. Box 416, 610041 Chengdu, People's Republic of China;

    rnChengdu Institute of Biology, Chinese Academy of Sciences, No. 9 Section 4, Renmin Nan Road, P.O. Box 416, 610041 Chengdu, People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    seed; dormancy; germination; reactive oxygen species; seasonal frozen soil; subalpine mountains;

    机译：种子;休眠;发芽;活性氧季节性冻土;亚高山山脉;

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