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https://doi.org/10.32779/gf.7.2-3.1

Shading treatments affect the growth characteristics, ornamental value, and photosynthetic activities of various Peperomia species and cultivars

Jae Jung Ahn ; Department of Environmental Horticulture, Sahmyook University, Seoul 01795, Republic of Korea.
Eun A Kim ; Department of Environmental Horticulture, Sahmyook University, Seoul 01795, Republic of Korea/Natural Science Research Institute, Sahmyook University, Seoul 01795, Republic of Korea.
Eun Ji Shin ; Department of Environmental Horticulture, Sahmyook University, Seoul 01795, Republic of Korea/Natural Science Research Institute, Sahmyook University, Seoul 01795, Republic of Korea.
Yeong Sunwoo ; Department of Environmental Horticulture, Sahmyook University, Seoul 01795, Republic of Korea/Natural Science Research Institute, Sahmyook University, Seoul 01795, Republic of Korea.
Jae Hwan Lee ; Department of Environmental Horticulture, Sahmyook University, Seoul 01795, Republic of Korea/Natural Science Research Institute, Sahmyook University, Seoul 01795, Republic of Korea. *
Sang Yong Nam ; Department of Environmental Horticulture, Sahmyook University, Seoul 01795, Republic of Korea/Natural Science Research Institute, Sahmyook University, Seoul 01795, Republic of Korea. *

* Dopisni autor.

Sažetak

This study investigated the suitable shading levels for Peperomia species and cultivars, a genus within the Piperaceae family known for its ornamental value as an indoor plant. We examined the effects of four different shading levels (45, 60, 75, and 99 %) using polyethylene (PE) shading films on four Peperomia species and cultivars, namely: P. obtusifolia (L.) A.Dietr., P. quadrangularis (J.V.Thomps.) A.Dietr., P. caperata Yunck. ‘Eden Rosso’, and P. caperata ‘Napoli Nights’. After an eight-week cultivation period, we assessed plant sizes, biomass (i.e. fresh and dry weight), leaf color, chlorophyll content (SPAD units), and five chlorophyll fluorescence parameters (Fv/Fm, ΦDo, ABS/RC, DIo/RC, and PIABS) in Peperomia species and cultivars. The results indicated that P. obtusifolia and ‘Eden Rosso’ exhibited the best growth performance within the 45-75 % shading range, whereas P. quadrangularis and ‘Napoli Nights’ showed optimal performance at the 45 and 60 % shading levels, respectively. All
species and cultivars demonstrated reduced growth and biomass under the 99 % shading level, hypothesized to be due to restricted CO2 assimilation under low-light conditions. Leaf color, measured by CIE76 color-difference (ΔE*ab) analysis based on the Commission Internationale de l'Eclairage Lab (CIELAB) color space, remained relatively constant across four different shading levels. Analyses of chlorophyll content and chlorophyll fluorescence revealed that high shading levels might deactivate some reaction centers, although the overall photosynthetic efficiency appeared largely unaffected. The performance index (PIABS) suggested that except for P. quadrangularis, which peaked at the 60 % shading level, P. obtusifolia, ‘Eden Rosso’, and ‘Napoli Nights’ generally performed well under the 45-
75 % shading levels. Therefore, Peperomia plants are capable of tolerating broad shading conditions, except for excessively high shading (99 % shading level). These results indicate that providing suitable shading levels is effective in improving the growth and photosynthetic activity of those several Peperomia species and cultivars.

Ključne riječi

chlorophyll fluorescence, CIELAB, ornamental plants, Peperomia, shade tolerance.

Hrčak ID:

322559

URI

https://hrcak.srce.hr/322559

Datum izdavanja:

30.6.2024.

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