Arabidopsis thaliana root elongation growth is sensitive to lunisolar tidal acceleration and may also be weakly correlated with geomagnetic variations
Arabidopsis thaliana root elongation growth is sensitive to lunisolar tidal acceleration and may also be weakly correlated with geomagnetic variations
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DOI：
10.1093/aob/mct052
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发表时间：
2013-05-01
期刊：
影响因子：
4.2
通讯作者：
Gallep, Cristiano M.
中科院分区：
文献类型：
--
作者：
Barlow, Peter W.;Fisahn, Joachim;Gallep, Cristiano M.
相关证据表明，在恒定弱光条件下生长的拟南芥根伸长速率与日月潮汐加速度之间存在一定的关系。拟南芥幼苗生长在恒温恒温的可控气候室中，接受荧光灯管的连续弱光照射，在接近自由运行状态的条件下排除了影响根生长速率的大多数非生物因素。利用高时间和空间分辨率的视频成像，在长达14d的时间内连续记录了均匀分布的垂直主根的伸长，并结合地球物理变量进行了分析。结果证实了太阳潮汐/根伸长的关系。文中还给出了由扰动风暴时间和AP指数估算的每小时延伸率与地磁活动同期变化之间的关系。根据在一年中不同季节记录的超过4d的根伸长速率时间序列，初步结论是根伸长对月亮力的变化做出响应，并且似乎也随着地磁场的变化而调整。因此，月球潮汐加速和地磁场都应该被认为是根生长速率的调节器，与其他更强大和更广为人知的非生物环境调节器，也许还有尚未探索的因素，如空气离子。大气压的主要变化不被认为是导致根伸长速率振荡的一个因素。
Correlative evidence suggests a relationship between the lunisolar tidal acceleration and the elongation rate of arabidopsis roots grown under free-running conditions of constant low light.Seedlings of Arabidopsis thaliana were grown in a controlled-climate chamber maintained at a constant temperature and subjected to continuous low-level illumination from fluorescent tubes, conditions that approximate to a free-running state in which most of the abiotic factors that entrain root growth rates are excluded. Elongation of evenly spaced, vertical primary roots was recorded continuously over periods of up to 14 d using high temporal- and spatial-resolution video imaging and were analysed in conjunction with geophysical variables.The results confirm the lunisolar tidal/root elongation relationship. Also presented are relationships between the hourly elongation rates and the contemporaneous variations in geomagnetic activity, as evaluated from the disturbance storm time and ap indices. On the basis of time series of root elongation rates that extend over 4 d and recorded at different seasons of the year, a provisional conclusion is that root elongation responds to variation in the lunisolar force and also appears to adjust in accordance with variations in the geomagnetic field. Thus, both lunisolar tidal acceleration and the geomagnetic field should be considered as modulators of root growth rate, alongside other, stronger and more well-known abiotic environmental regulators, and perhaps unexplored factors such as air ions. Major changes in atmospheric pressure are not considered to be a factor contributing to oscillations of root elongation rate.