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在绿色藻类中,在高二氧化碳水平下选择1000代的表型后果

Sinéad Collins¹, Graham Bell

¹Biology Department, McGill University, Montreal, Quebec H3A 1B1, Canada.

|October 1, 2004

概括

全球植物产量估计可能因适应大气二氧化碳 (CO2) 的上升而受到偏差. 长期实验表明,在正常的二氧化碳水平下,一些藻类进化了对生长有害的特征.

科学领域:

植物生理学植物生理学
进化生物学是进化的生物学.
气候变化科学气候变化科学

背景情况:

未来的全球植物产量估计取决于植物对大气二氧化碳升高的反应.
植物种群可能适应不断变化的大气条件,从而导致未来的基因不同社区.
这些进化社区的属性是未知的,可能会影响碳池动态预测.

研究的目的:

为了研究长期选择在高二氧化碳度下生长的表型后果.
了解植物种群如何适应未来的大气条件.
评估适应对全球碳循环模型的潜在影响.

主要方法:

使用单细胞绿藻Chlamydomonas进行了一项长期选择实验.
选线被暴露在高二氧化碳度 (1050 ppm) 中大约1000代.
测量了包括光合作用,呼吸,叶绿素含量和细胞大小在内的表型特征.

主要成果:

克拉米多马纳斯的选择线未能发展出适应高二氧化碳度的特定适应性.
一些细菌系进化出一种综合症,其特点是光合作用和呼吸率高,叶绿素含量增加,细胞大小减少.
这些进化的线条在环境二氧化碳度下表现出较差的增长.

结论:

观察到的表型变化可能是由于与碳度机制相关的基因中条件中性突变的积累.
适应二氧化碳增加可能会导致权衡,影响不同环境条件下的工厂性能.
这些发现强调了预测植物社区对气候变化的反应及其对全球碳循环的影响的复杂性.

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