Stress caused by environmental factors evokes dynamic changes in plant phenotypes. In this study, we deciphered simultaneously the reaction of plant growth and chlorophyll fluorescence related parameters using a novel approach which combines existing imaging technologies (GROWSCREEN FLUORO). Three different abiotic stress situations were investigated demonstrating the benefit of this approach to distinguish between effects related to (1) growth, (2) chlorophyll-fluorescence, or (3) both of these aspects of the phenotype. In a drought stress experiment with more than 500 plants, poly(ADP-ribose) polymerase (PARP) deficient lines of Arabidopsis thaliana (L.) Heynh showed increased relative growth rates (RGR) compared with C24 wild-type plants. In chilling stress, growth of PARP and C24 lines decreased rapidly, followed by a decrease in Fv/Fm. Here, PARP-plants showed a more pronounced decrease of Fv/Fm than C24, which can be interpreted as a more efficient strategy for survival in mild chilling stress. Finally, the reaction of Nicotiana tabacum L. to altered spectral composition of the intercepted light was monitored as an example of a moderate stress situation that affects chlorophyll-fluorescence related, but not growth-related parameters. The examples investigated in this study show the capacity for improved plant phenotyping based on an automated and simultaneous evaluation of growth and photosynthesis at high throughput.

译文

环境因素引起的胁迫引起植物表型的动态变化。在这项研究中,我们使用一种结合了现有成像技术 (GROWSCREEN FLUORO) 的新颖方法,同时破译了植物生长和叶绿素荧光相关参数的反应。研究了三种不同的非生物胁迫情况,证明了这种方法有助于区分与 (1) 生长,(2) 叶绿素荧光或 (3) 表型这两个方面有关的影响。在对500多种植物的干旱胁迫实验中,拟南芥 (L.) 的聚 (ADP-核糖) 聚合酶 (PARP) 缺陷系与C24野生型植物相比,Heynh的相对生长率 (RGR) 增加。在低温胁迫下,PARP和C24品系的生长迅速下降,随后Fv/Fm下降。在这里,PARP植物显示出比C24更明显的Fv/Fm降低,这可以解释为在轻度低温胁迫下生存的更有效策略。最后,监测了Nicotiana tabacum L.对截获光的光谱组成改变的反应,作为影响叶绿素荧光相关但不影响生长相关参数的中等胁迫情况的一个例子。本研究中研究的实例表明,基于对高通量的生长和光合作用的自动同时评估,可以改善植物表型。

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