Chlorophyll fluorescence transients in a barley mutant lacking Photosystem I
Chlorophyll fluorescence transients in a barley mutant lacking Photosystem I
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缺乏光系统 I 的大麦突变体中的叶绿素荧光瞬变
DOI：
10.1007/bf00016561
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发表时间：
1993
影响因子：
3.7
通讯作者：
R. P. Cox
中科院分区：
文献类型：
--
作者：
R. K. Juhler;Mette Miller;D. Simpson;R. P. Cox
我们用调制荧光测量方法比较了一个缺失光系统I的大麦突变体(viridis-zb63)与相应的野生型大麦的性质。突变体表现出两个意想不到的特征。首先，在与空气中浓度相近的O2存在下，光中的荧光信号有一个缓慢的衰减，2%的O2对此没有影响。观察到的下降主要是由于非光化学猝灭的增加。其次，在没有O2的情况下，饱和的光脉冲导致荧光信号的显著瞬时下降；在没有CO2和O2的情况下，野生型植物也可以观察到类似的影响。
We have compared the properties of a mutant of barley lacking Photosystem I (viridis-zb63) with the corresponding wild type using modulated fluorescence measurements. The mutant showed two unexpected characteristics. Firstly, there was a slow decline in the fluorescence signal in the light which was dependent on the presence of O2at concentrations similar to that in air; 2% O2in N2had no effect. The observed decline was mainly due to an increase in the non-photochemical quenching. Secondly, in the absence of O2, saturating light pulses caused a pronounced transient decrease in the fluorescence signal; a similar effect could also be observed in wild type plants when neither CO2nor O2was present.