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Periodicity and Spectral Composition of Light in the Regulation of Hypocotyl Elongation of Sunflower Seedlings
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SYSNO ASEP 0562279 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Periodicity and Spectral Composition of Light in the Regulation of Hypocotyl Elongation of Sunflower Seedlings Author(s) Vinterhalter, D. (RS)
Vinterhalter, B. (RS)
Motyka, Václav (UEB-Q) RID, ORCIDNumber of authors 3 Article number 1982 Source Title Plants. - : MDPI
Roč. 11, č. 15 (2022)Number of pages 17 s. Language eng - English Country CH - Switzerland Keywords diurnal photoperiods ; free-running photoperiods ; light entrainment ; monochromatic LED light ; rhythmicity of hypocotyl elongation OECD category Plant sciences, botany R&D Projects GA19-12262S GA ČR - Czech Science Foundation (CSF) EF16_019/0000738 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UEB-Q - RVO:61389030 UT WOS 000840168200001 EID SCOPUS 85136812938 DOI 10.3390/plants11151982 Annotation This study presents the hypocotyl elongation of sunflower seedlings germinated under different light conditions. Elongation was rhythmic under diurnal (LD) photoperiods but uniform (arrhythmic) under free-running conditions of white light (LL) or darkness (DD). On the sixth day after the onset of germination, seedlings were entrained in all diurnal photoperiods. Their hypocotyl elongation was dual, showing different kinetics in daytime and nighttime periods. The daytime elongation peak was around midday and 1–2 h after dusk in the nighttime. Plantlets compensated for the differences in the daytime and nighttime durations and exhibited similar overall elongation rates, centered around the uniform elongation in LL conditions. Thus, plants from diurnal photoperiods and LL could be grouped together as white-light treatments that suppressed hypocotyl elongation. Hypocotyl elongation was significantly higher under DD than under white-light photoperiods. In continuous monochromatic blue, yellow, green, or red light, hypocotyl elongation was also uniform and very high. The treatments with monochromatic light and DD had similar overall elongation rates, thus, they could be grouped together. Compared with white light, monochromatic light promoted hypocotyl elongation. Suppression of hypocotyl elongation and rhythmicity reappeared in some combination with two or more monochromatic light colors. The presence of red light was obligatory for this suppression. Plantlets entrained in diurnal photoperiods readily slipped from rhythmic into uniform elongation if they encountered any kind of free-running conditions. These transitions occurred whenever the anticipated duration of daytime or nighttime was extended more than expected, or when plantlets were exposed to constant monochromatic light. This study revealed significant differences in the development of sunflower plantlets illuminated with monochromatic or white light. Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2023 Electronic address https://doi.org/10.3390/plants11151982
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