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LIMITS TO SEXUAL REPRODUCTION IN GEOTHERMAL BRYOPHYTES

机译：地热苔藓植物性繁殖的限制

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摘要

Previous research suggests that while sexual reproduction generally increases with environmental stress it may decrease with extreme stress, at the edge of eukaryotic life. In this study, we explored the limits to sexual reproduction in an extremophile, bryophyte system to ultimately understand the processes that limit sexual reproduction. We used field data from geothermal sites at Lassen Volcanic National Park, California, to demonstrate that sexual reproduction, as measured by the number of sporophytes per shoot, decreases with increasing environmental stress. We found that the number of sporophytes per shoot is positively correlated with distance from geothermal features. When Pohlia nutans plants were transplanted to mesic conditions, high numbers of gametoecia and sporophytes were produced, regardless of where along the environmental stress gradient plants originated, suggesting that physiological stress rather than local adaptation is constraining sexual reproduction in this extremophile system. We discuss our results with respect to previous work on sex in extreme environments.
机译：先前的研究表明，尽管有性生殖通常随着环境压力而增加，但在真核生物生命的边缘，随着极度压力而可能减少。在这项研究中，我们探索了极端微生物，苔藓植物系统中性繁殖的极限，以最终了解限制性繁殖的过程。我们使用来自加利福尼亚州拉森火山国家公园地热站点的现场数据来证明，按每枝芽孢子的数量来衡量，有性生殖随着环境压力的增加而降低。我们发现每个芽孢子体的数量与距地热特征的距离呈正相关。当将Pohlia nutans植物移植到中等条件下时，无论环境胁迫梯度植物起源于何处，都会产生大量的配子体和孢子体，这表明生理胁迫而不是局部适应正在限制这种极端微生物系统的有性繁殖。我们将讨论有关极端环境中性行为的先前研究结果。

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  • 来源
    《International journal of plant sciences》 |2011年第7期|p.870-878|共9页
  • 作者

    Sarah M. Eppley; Todd N. Rosenstiel; Camille B. Graves; Estefanfa Llaneza Garcia;

  • 作者单位

    Portland State University, Center for Life in Extreme Environments, Department of Biology, P.O. Box 751, Portland, Oregon 97207-0751, U.S.A;

    Portland State University, Center for Life in Extreme Environments, Department of Biology, P.O. Box 751, Portland, Oregon 97207-0751, U.S.A;

    Portland State University, Center for Life in Extreme Environments, Department of Biology, P.O. Box 751, Portland, Oregon 97207-0751, U.S.A;

    Portland State University, Center for Life in Extreme Environments, Department of Biology, P.O. Box 751, Portland, Oregon 97207-0751, U.S.A;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    bryophyte; reproduction; stress; temperature.;

    机译：苔藓植物再生产;强调;温度。;
  • 入库时间 2022-08-18 03:45:40

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