Department of Physics, University of Life Sciences, Akademicka 13, 20-950, Lublin, Poland.
Department of Applied Physics, Lublin University of Technology, Nadbystrzycka 38 D, 20-618, Lublin, Poland.
Sci Rep. 2019 Mar 12;9(1):4287. doi: 10.1038/s41598-019-40645-z.
The seasonal senescence of leaves in the phenological cycle coincides with the change of their strength properties which determine resistance to environmental conditions and the efficiency of the photosynthesis process. That affects the development, growth and condition of the plant. Therefore, the aim of this paper was to observe and compare the results of strength tests performed on the leaves of two species of trees popular in Poland - lime and maple. As well as chlorophyll fluorescence and photosynthetic pigments content in the context of the changes occurring during the entire leaf life cycle. Obtained results showed that the strength properties of the tested leaves reached the minimum values in spring and the maximum in the summer similarly to the leaf greenness index. Whereas the fluorescence increased which the seasonal senescence in opposition to the photosynthesis efficiency of the leaves. Collected data revealed that strength parameters and photosynthetic pigment content were significantly higher for maple leaves than for lime leaves. Studies showed differences between physiological and mechanical properties of the leaves of two trees species, even if they grew under the same environmental conditions. It is concluded from the results that phenotype and physical parameters of leaves are related to seasonal senescence.
叶片在物候周期中的季节性衰老与它们的强度特性变化一致，这些特性决定了它们对环境条件的抵抗力和光合作用过程的效率。这会影响植物的发育、生长和状况。因此，本文的目的是观察和比较在波兰两种常见树种——椴树和枫树上的叶片的强度测试结果。以及叶绿素荧光和光合色素含量在整个叶片生命周期中发生的变化。研究结果表明，与叶片的绿色指数相似，测试叶片的强度特性在春季达到最小值，在夏季达到最大值。而荧光随着季节性衰老而增加，与叶片的光合作用效率相反。收集的数据表明，枫树叶的强度参数和光合色素含量明显高于椴树叶。研究表明，即使在相同的环境条件下，两种树种叶片的生理和机械特性也存在差异。从结果中可以得出结论，叶片的表型和物理参数与季节性衰老有关。
