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2025 Vol.38, Issue 6 Preview Page

Research Article

Photoperiod Optimization in Controlled Environments: Interspecific Differences in Vegetative Growth and Photochemical Efficiency among Three Phedimus Species Native to Korea
Jae Hwan Lee12
,
Samuel Lee1
,
Jeong Geun Lee3
,
Seon Yong Hwang4
,
Sang Yong Nam567
1Post-doc, Department of Environmental Horticulture, Sahmyook University, Seoul 01795, Korea
2Senior Researcher, Natural Science Research Institute, Sahmyook University, Seoul 01795, Korea
3Graduate Student, Department of Environmental Horticulture, Sahmyook University, Seoul 01795, Korea
4Undergraduate Student, Environmental Design & Horticulture, Sahmyook University, Seoul 01795, Korea
5Professor, Department of Environmental Horticulture, Sahmyook University, Seoul 01795, Korea
6Director, Natural Science Research Institute, Sahmyook University, Seoul 01795, Korea
7Professor, Environmental Design & Horticulture, Sahmyook University, Seoul 01795, Korea
*Corresponding Author
1 December 2025. pp. 826-841
PDF XML Citation
Abstract

In this study, we investigated changes in vegetative growth and photochemical efficiency in three native Korean Phedimus species under four different photoperiods: 8, 10, 12, and 14 h·d-1. The longest photoperiod (14 h·d-1) simultaneously improved vegetative growth and photochemical efficiency (Fv/Fm and PIABS) in P. takesimensis, whereas P. latiovalifolium exhibited a pronounced enhancement in plant quality indices (compactness and Dickson quality index). In P. zokuriensis, root length and several stress indicators (ΦDo, ABS/RC, and DIo/RC) increased under the shortest photoperiod (8 h·d-1), suggesting that the optimization of organ-specific development (shoot vs. root growth) and the balance between photochemical efficiency and physiological stress should be considered together. In controlled environments, a species-tailored photoperiod strategy appears appropriate, aiming to maintain or improve Fv/Fm and PIABS while suppressing excessive increases in ABS/RC, DIo/RC, and ΦDo. As these findings were based on an evaluation of photoperiod as a single factor, further validation that includes the interactions between light quality, light intensity, and temperature is warranted. Overall, the results of this study provide insights into species-specific responses to photoperiod and outline strategies for differentiating cultivation settings among congeneric species.

Keywords
Chlorophyll fluorescence
Crassulaceae
Daylength
Plant quality indices
Resource allocation
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Information
  • Publisher :The Plant Resources Society of Korea
  • Publisher(Ko) :한국자원식물학회
  • Journal Title :Korean Journal of Plant Resources
  • Journal Title(Ko) :한국자원식물학회지
  • Volume : 38
  • No :6
  • Pages :826-841
  • Received Date : 2025-10-01
  • Revised Date : 2025-11-19
  • Accepted Date : 2025-11-19
  • DOI :https://doi.org/10.7732/kjpr.2025.38.6.826
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