The high red/far-red ratio supports the acclimation of fernPlatycerium bifurcatumto high light

Abstract

Background and aims: High light causes disturbances in photosynthetic phosphorylation or damage to the photosystem II (PSII) structure or even assimilation tissues. The value of the red/ far-red ratio (R/FR) provides the plant with information on the environmental light conditions, regulating, among others, photosynthetic activity and pigment composition of the plant. The response of the photosynthetic apparatus of the sporotrophophylls and nest leaves of Platycerium bifurcatum, grown for 6 months at the low or high R/FR ratio, were studied. Later, the plants were transferred to high light (1,200 μmol quantum • m −2 • s −1 ). Methods: Changes in PSII photochemical activity were determined based on non-destructive methods of chlorophyll a fluorescence kinetics analysis. The measurement of radiation reflectance from the leaves allowed to determine the content of selected pigments related to the photosynthesis process and to assess changes in the Photochemical Reflectance Index. The calculation of reflectance difference and sensitivity analysis was used to identify so-called "stress-sensitive wavelengths". Results and discussion: Plant growth at high R/FR ratio prepares photosynthetic apparatus of ferns to high light and enables more efficient conversion of absorbed photons. The increase in the amount of photoprotective compounds allows the protection against photoinhibition in the sporotrophophyll leaves that play key roles in plant nutrition and reproduction.

Complex consequences of disturbance on canopy plant communities of world forests: a review and synthesis

“…monostachia may be better able to respond to warmer conditions in the future (North et al ., 2016). The epiphytic fern, Platycerium bifurcatum , increased its production of photoprotective compounds in response to higher light, which provided protection against photoinhibition for its sporotrophophylls (Oliwa & Skoczowski, 2019).…”

“…One bromeliad species (Guzmania monostachia) exhibited positive plasticity in leaf size, in contrast to its conspecific (G. lingulate), which manifested negative plasticity, so G. monostachia may be better able to respond to warmer conditions in the future (North et al, 2016). The epiphytic fern, Platycerium bifurcatum, increased its production of photoprotective compounds in response to higher light, which provided protection against photoinhibition for its sporotrophophylls (Oliwa & Skoczowski, 2019).…”

The Spectral Compositions of Light Changes Physiological Response of Chinese Cabbage to Elevated Ozone Concentration

“…The analysis of Chl a fluorescence kinetics was also used to assess the interaction of ozone and other environmental stresses, e.g., high light [ 12 ]. This method is also particularly useful for assessing changes occurring in PSII under the influence of the different spectral compositions of light [ 25 , 26 ]. A complementary method that allows determining the effect of O 3 on photosynthesis is gas exchange analysis, i.e., net photosynthesis, as well as transpiration, stomatal conductance and intracellular CO 2 concentration [ 6 , 13 , 24 ].…”