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CHANGING THE DENSITY OF THE EXTERNAL MEDIUM CAN MODULATE AND REVERSE THE GRAVITY RESPONSE OF PLANT CELLS AND ORGANS

机译：改变外部介质的密度可以调节和逆转植物细胞和有机体的重力响应

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As an alternative to the statolith model, we havernpresented a model for plant gravity sensing in which thernentire protoplast functions as the gravity sensor. Thisrngravitational pressure model was developed as a resultrnof experiments with the large, statolith-free, intermodalrncells of Chara. The question remains whether therngravitational pressure model can explain the gravityrnresponses of higher plants containing statocytes. Werntested the gravitational pressure model by monitoringrngravitropic curvature of statolith-containing roots inrnmedia of differing densities. The statolith modelrnpredicts that density of the external medium will havernno effect on gravity sensing whereas the gravitationalrnpressure model predicts that changing the density of thernexternal medium will affect gravity sensing, andrnconsequently the gravity response. We find thatrnincreasing the density of the external medium inhibits,rnand in some cases reverses the direction of gravitropicrncurvature of these roots. These data are consistent withrnthe gravitational pressure model for plant gravityrnsensing and inconsistent with the statolith model.

机译：作为层状石模型的替代方案，我们提出了一种植物重力传感模型，其中植物原生质体充当重力传感器。该重力引力模型是通过对大型无杂化Chara联运单元Chara进行实验而开发的。问题仍然是，引力压力模型是否可以解释含有静态细胞的高等植物的重力响应。通过监测含有密度不同的含石料的根的向心曲率，对重力模型进行了Werntest检验。层状石模型预测外部介质的密度对重力感应没有影响，而重力压力模型预测外部介质的密度变化将影响重力感应，因此影响重力响应。我们发现，增加外部介质的密度会抑制这些根，并且在某些情况下会扭转这些根的重力曲率方向。这些数据与植物重力感应的重力模型一致，并且与层状石模型不一致。

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《Proceedings of Life in space for life on earth》|2012年|1-2|共2页
会议地点 Aberdeen(GB)
作者
Mark P. Staves; Naila Kovacevic;
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作者单位

Department of Cell and Molecular Biology, Grand Valley State University, Allendale MI 49401, USA, Email: stavesm@gvsu.edu;

Department of Cell and Molecular Biology, Grand Valley State University, Allendale MI 49401, USA;

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CHANGING THE DENSITY OF THE EXTERNAL MEDIUM CAN MODULATE AND REVERSE THE GRAVITY RESPONSE OF PLANT CELLS AND ORGANS

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