The global trend in plant twining direction
The global trend in plant twining direction
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DOI：
10.1111/j.1466-8238.2007.00326.x
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发表时间：
2007-11-01
影响因子：
6.4
通讯作者：
Franks, Peter
中科院分区：
文献类型：
--
作者：
Edwards, Will;Moles, Angela T.;Franks, Peter
目的在全球范围内研究攀援植物生长的方向模式。我们测试了三个假设：（1）缠绕方向是随机确定的;（2）缠绕方向是由太阳在天空中的视运动的顶点确定的;（3）缠绕方向是由科里奥利效应确定的。100茎遇到沿着横断面通过自然vegetation.Results 92%的1485缠绕茎，我们记录的右手螺旋生长，即他们在anticcrosslinking方向。这与随机有显著差异（P < 0.001）。茎右旋缠绕的比例与纬度（P = 0.33）和半球（P = 0.63）无关。这些数据与缠绕方向是由太阳通过天球的相对路径或科里奥利效应决定的观点不一致。因此，我们拒绝所有三个我们的hypothes.Main结论右手螺旋生长在攀援植物的优势不能解释的假设试图链接植物的生长行为和全球位置。我们的研究结果的另一种假设是，普遍存在的反螺旋缠绕现象是在亚细胞水平上操作的微管取向的函数。
Aim To examine, at a global scale, patterns in the direction in which climbing plants twine. We tested three hypotheses: (1) that twining direction is determined randomly; (2) that twining direction is determined by apices following the apparent movement of the sun across the sky; and (3) that twining direction is determined by the Coriolis effect.Location Seventeen sites spanning nine countries, both hemispheres and 65 degrees of latitude.Methods Twining direction was recorded for the first c. 100 stems encountered along transects through natural vegetation at each site.Results Ninety-two per cent of the 1485 twining stems we recorded grew in right-handed helices, i.e. they twined in an anticlockwise direction. This is significantly (P < 0.001) different from random. The proportion of stems twining right-handedly (anticlockwise) was independent of both latitude (P = 0.33) and hemisphere (P = 0.63). These data are inconsistent with the idea that twining direction is determined by either the relative passage of the sun through the celestial sphere or by the Coriolis effect. Thus, we reject all three of our hypotheses.Main conclusions The predominance of right-handed helical growth in climbing plants cannot be explained by hypotheses attempting to link plant growth behaviour and global location. One alternative hypothesis for our findings is that the widespread phenomenon of anticlockwise twining arises as a function of microtubule orientation operating at a subcellular level.