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首页> 外文期刊>Microgravity science and technology >The 'Root' experiment of the 'Cervantes' Spanish Soyuz Mission: Cell proliferation and nucleolar activity alterations in Arabidopsis roots germinated in real or simulated microgravity
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The 'Root' experiment of the 'Cervantes' Spanish Soyuz Mission: Cell proliferation and nucleolar activity alterations in Arabidopsis roots germinated in real or simulated microgravity

机译：“塞万提斯”西班牙联盟号任务的“根”实验：以真实或模拟微重力萌发的拟南芥根中的细胞增殖和核仁活性改变

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摘要

In an experiment conducted in the "Cervantes " Spanish Soyuz Mission, a 10-day flight to the International Space Station, Arabidopsis seeds were germinated, seedlings grew for 4 days at 22℃, and they were fixed in flight with paraformaldehyde. A ground 1 g control experiment was replicated, and an additional experiment in simulated microgravity, using a Random Positioning Machine, was performed in the same conditions. Structural, morphometric and immunocytochemical data were compared. Glutaraldehyde-fixed seedlings similarly grown in the Space Shuttle (STS-84 Mission) were also used for ultra-structural and morphometric studies. Seedlings grown for 4 days in real or simulated weightlessness showed a longer size than the ground 1 g control. Root meristematic cells showed an enhanced proliferating rate, but ribosome biogenesis was reduced, as inferred from the nucleolar size and from the levels of the nucleolar protein nucleolin. This could be the consequence of the acceleration of the cell cycle, with shortening of its phases. Weightlessness induces stress in the plant, influencing cellular processes decisive for development and morphogenesis. This stress may endanger the plant and would require the action of compensating specialized defence mechanisms.
机译：在“塞万提斯”西班牙联盟号航天飞机进行的一项实验中，该航天员在飞往国际空间站的10天飞行中，使拟南芥种子发芽，幼苗在22℃下生长4天，并在飞行中用低聚甲醛固定。复制地面1 g对照实验，并在相同条件下使用随机定位机在模拟微重力下进行其他实验。比较了结构，形态和免疫细胞化学数据。同样在航天飞机（STS-84 Mission）中生长的戊二醛固定幼苗也用于超结构和形态计量研究。在真实或模拟失重条件下生长4天的幼苗显示出比地面1 g对照更长的大小。从核仁大小和核仁蛋白核仁水平可以推断出，根部分生组织细胞增殖速率提高，但核糖体的生物发生却减少了。这可能是细胞周期加速，相位缩短的结果。失重会诱导植物产生压力，影响决定性发育和形态发生的细胞过程。这种压力可能危害植物，并需要采取补偿专门防御机制的行动。

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