Chloroplast translocations in Lemna trisulca L. induced by continuous irradiation and by light pulses
Chloroplast translocations in Lemna trisulca L. induced by continuous irradiation and by light pulses
复制标题
连续照射和光脉冲诱导的Lemna trisulca L.叶绿体易位
作者：
J. Zurzycki;T. Walczak;H. Gabryś;J. Kajfosz
提出了描述叶绿体稳态位置依赖于注量率的解析模型，以及叶绿体对单个强光脉冲的响应。该模型基于以下假设：1.细胞的辐照在细胞膜区域产生状态X，与局部注量率成正比。打开灯后，X的值以约3分钟的时间常数指数增加。在相同的时间常数下，X的暗衰变也是指数的。X的水平控制着各种叶绿体的排列。2.状态X进一步产生两种状态：Y1和Y2，第一种状态代表对叶绿体的吸引力，第二种状态代表排斥力。对于这两种状态都找到了经验公式。注量率响应曲线可用函数Y1和Y2描述。3.动力学分析需要引入两个附加函数Z，以解释驱动和阻力因素对叶绿体运动的延迟和时间分散。编制了模型的计算机程序，并将计算结果与实验数据(注量率、响应曲线和脉冲效应)进行了比较，结果令人满意。起初，没有人试图将任何物理意义归因于假设的状态。在讨论中提出了这方面的一些建议。
The analytical model describing the steady state position of chloroplasts in dependence of fluence rate as well as the chloroplast response to single strong light pulses has been proposed. The model is based on the following assumptions: 1. Irradiation of the cell generates the stateXin the cell membrane region, proportional to the local fluence rate. After switching on the light, the value ofXincreases exponentially with the time constant of about 3 min. The dark decay ofXis also exponential with the same time constant. The level ofXcontrols all kinds of chloroplast arrangements. 2. The stateXgenerates two further states:Y1andY2, the first of them representing attraction forces for chloroplasts and the second representing repulsion forces. Empirical equations have been found for bothYstates. The fluence rate response curve can be described with the use of functionsY1andY2. 3. The kinetic analysis requires the introduction of two additional functions Z in order to account for delays and time dispersion of the chloroplast movement in response to driving and resistance factors. The computer program for the proposed model was developed and the results of calculations were compared with experimental data (fluence rate response curve and pulse effects) with satisfactory agreement. Initially no attempt was made to ascribe any physical meaning to the postulated states. Some suggestions in this respect are mentioned in the discussion.
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