College of Horticulture, Fujian Agricultural and Forestry University, Fuzhou, China.
Department of Horticulture, College of Agriculture, University of Al-Azhar (branch Assiut), Assiut, Egypt.
PLoS One. 2021 Apr 15;16(4):e0249373. doi: 10.1371/journal.pone.0249373. eCollection 2021.
It is already known that the process of photosynthesis depends on the quality and intensity of light. However, the influence of the new light sources recently used in horticulture, known as Light Emitting Diodes (LEDs), on this process is not yet fully understood. Chlorophyll a fluorescence measurement has been widely used as a rapid, reliable, and noninvasive tool to study the efficiency of the photosystem II (PSII) and to evaluate plant responses to various environmental factors, including light intensity and quality. In this work, we tested the responses of the tomato photosynthetic apparatus to different light spectral qualities. Our results showed that the best performance of the photosynthetic apparatus was observed under a mixture of red and blue light (R7:B3) or a mixture of red, green and blue light (R3:G2:B5). This was demonstrated by the increase in the effective photochemical quantum yield of PSII (Y[II]), photochemical quenching (qP) and electron transport rate (ETR). On the other hand, the mixture of red and blue light with a high proportion of blue light led to an increase in non-photochemical quenching (NPQ). Our results can be used to improve the production of tomato plants under artificial light conditions. However, since we found that the responses of the photosynthetic apparatus of tomato plants to a particular light regime were cultivar-dependent and there was a weak correlation between the growth and photosynthetic parameters tested in this work, special attention should be paid in future research.
已知光合作用过程依赖于光的质量和强度。然而，最近在园艺中使用的新型光源——发光二极管（LED）对这一过程的影响尚未完全了解。叶绿素荧光测量已被广泛用作一种快速、可靠和非侵入性的工具，用于研究光系统 II（PSII）的效率，并评估植物对各种环境因素的反应，包括光强度和质量。在这项工作中，我们测试了番茄光合器官对不同光谱质量光的反应。我们的结果表明，在红光和蓝光的混合物（R7:B3）或红光、绿光和蓝光的混合物（R3:G2:B5）下，光合器官的性能最佳。这表现为 PSII 的有效光化学量子产量（Y[II]）、光化学猝灭（qP）和电子传递率（ETR）的增加。另一方面，红光和蓝光的混合物中蓝光比例过高会导致非光化学猝灭（NPQ）增加。我们的结果可用于改善番茄植物在人工光照条件下的产量。然而，由于我们发现番茄植株的光合器官对特定光照条件的反应依赖于品种，并且在这项工作中测试的生长和光合参数之间相关性较弱，因此在未来的研究中应特别注意。
