Shibaeva, T.G.; Mamaev, A.V.; Sherudilo, E.G.; Ikkonen, E.N.; Titov, A.F. Effects of Abnormal Light/Dark Cycles and Continuous Lighting on Tomato and Eggplant. Preprints2023, 2023070050. https://doi.org/10.20944/preprints202307.0050.v1
APA Style
Shibaeva, T.G., Mamaev, A.V., Sherudilo, E.G., Ikkonen, E.N., & Titov, A.F. (2023). Effects of Abnormal Light/Dark Cycles and Continuous Lighting on Tomato and Eggplant. Preprints. https://doi.org/10.20944/preprints202307.0050.v1
Chicago/Turabian Style
Shibaeva, T.G., Elena N. Ikkonen and Alexander F. Titov. 2023 "Effects of Abnormal Light/Dark Cycles and Continuous Lighting on Tomato and Eggplant" Preprints. https://doi.org/10.20944/preprints202307.0050.v1
Abstract
Response of tomato and eggplant to continuous lighting (CL) and abnormal light/dark (L/D) cycles was studied to elucidate the role of the absence of the dark period in the diurnal cycle in the development of leaf injuries under CL. Four light treatments were set: 16/8 h (control), 24/0 h (CL), 6/6 h, and 24/24 h (abnormal L/D cycles). These light treatments provided average daily light integrals of 17.3, 25.9, 13.0 and 13.0 mol m-2 day-1, respectively. Results of this work have shown that in both tomato and eggplant abnormal L/D cycles caused photoinhibition and leaf injuries similar to those in CL-grown plants. Induced defense mechanisms were not strong enough to contend against oxidative stress caused by light treatments that provided plants with even smaller DLI than 16/8 h photoperiod did. Half time during abnormal L/D cycles were dark periods. Despite these facts, abnormal L/D cycles were injurious. It is concluded that photooxidative stress induced by CL can not be attributed to excessive DLI or the continuity of light itself (the absence of dark periods). Therefore, we believe that the hypothesis suggesting circadian asynchrony to be the main triggering factor of CL-induced leaf injuries is the most plausible among many others proposed.
Biology and Life Sciences, Agricultural Science and Agronomy
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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