Ejection mechanics and trajectory of the ascospores of Gibberella zeae (anamorph Fuarium graminearum)
Ejection mechanics and trajectory of the ascospores of Gibberella zeae (anamorph Fuarium graminearum)
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DOI：
10.1016/j.fgb.2005.03.008
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发表时间：
2005-06-01
影响因子：
3
通讯作者：
Vogel, S
中科院分区：
文献类型：
--
作者：
Trail, F;Gaffoor, I;Vogel, S
由于风速在表面降至零，强制喷射应该有助于孢子传播。但是对于微小的孢子，相对于表面积来说质量很小，高喷射速度只能产生一个短距离的弹道，它们的阻力是如此有害。因此，实现高速需要惊人的加速度。在子囊菌Gibberella zeae中，我们测定了子囊孢子从子囊壳发射的速度和动能，以及驱动发射的压力的来源和大小。我们问，火箭内部的压力是否足以解释发射速度和能量。发射速度为34.5 m s（-1），需要1.54 MPa的压力和870，000 g的加速度--这是生物系统中报道的最高加速度。这种分析使我们能够排除外质液的主要糖成分甘露醇。作为一个关键的作用，在推动放电..并支持钾离子流在该机制中的作用。(c)2005年爱思唯尔公司All rights reserved.
Since wind speed drops to zero at a surface, forced ejection should facilitate spore dispersal. But for tiny spores, with low mass relative to surface area, high ejection speed yields only a short range trajectory, so pernicious is their drag. Thus, achieving high speeds requires prodigious accelerations. In the ascomycete Gibberella zeae, we determined the launch speed and kinetic energy of ascospores shot from perithecia, and the source and magnitude of the pressure driving the launch. We asked whether the pressure inside the ascus suffices to account for launch speed and energy. Launch speed was 34.5 m s(-1) requiring a pressure of 1.54 MPa and an acceleration of 870,000 g-the highest acceleration reported in a biological system. This analysis allows us to discount the major sugar component of the epiplasmic fluid, mannitol.. as having a key role in driving discharge.. and supports the role of potassium ion flux in the mechanism. (c) 2005 Elsevier Inc. All rights reserved.