Exposure to blue light during morphogenesis enhances high-light tolerance in Platycerium bifurcatum sporophytes
Abstract
The spectral composition of light during early plant development may influence the functional organization of the photosynthetic apparatus and plant tolerance to environmental stress. However, these mechanisms remain poorly understood in ferns. The aim of this study was to determine whether exposure to blue light during early sporophyte development affects the subsequent tolerance of the photosynthetic apparatus to high-light stress in Platycerium bifurcatum. Spores, gametophytes, and young sporophytes were cultivated for nine weeks under either blue or white light. Subsequently, all plants were grown for nine months under identical environmental conditions. One-year-old sporophytes were then exposed to high irradiance (PPFD ≤ 800 μmol m-2 s-1) for seven days. Photosynthetic performance was assessed using fast chlorophyll a fluorescence kinetics and OJIP analysis. Plants that developed initially under blue light exhibited greater tolerance to high-light stress, maintaining higher photosynthetic performance indices and showing less pronounced impairment of photosynthetic electron transport following exposure to excessive irradiance. These findings demonstrate that the spectral composition of light during morphogenesis influences the acclimation capacity of the photosynthetic apparatus. Appropriate manipulation of light quality using LED technology may therefore provide an effective strategy for improving the physiological quality of commercially propagated ornamental ferns.
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