Supplemental light application can improve the growth and development of strawberry plants under salinity and alkalinity stress conditions

Abstract

The use of complementary light spectra is a potential new approach to studying the increase in plant resilience under stress conditions. The purpose of this experiment was to investigate the effect of different spectra of complementary light on the growth and development of strawberry plants under salinity and alkalinity stress conditions. Plants were grown in the greenhouse under ambient light and irradiated with blue (460 nm), red (660 nm), blue/red (1:3), and white/yellow (400–700 nm) light during the developmental stages. The stress treatments were as follows: control (non-stress), alkalinity (40 mM NaHCO3), and salinity (80 mM NaCl). Our results showed that salinity and alkalinity stress decreased fresh and dry weights and the number of green leaves, and increased chlorotic, tip burn, and dry leaves. The blue and red spectra had a greater effect on reducing the effects of stress compared to other spectra. Stress conditions decreased SPAD and RWC, although blue light increased SPAD, and blue/red light increased RWC under stress conditions. Blue/red and white/yellow light had the greatest effect on reproductive traits. Stress conditions affected fruit color indicators, and red and blue light had the most significant effect on these traits. Under stress conditions, sodium uptake increased, while K, Ca, Mg, and Fe uptake decreased, markedly. Blue and red light and their combination alleviated this reducing effect of stress. It can be concluded that the effects of salinity and alkalinity stresses can be reduced by manipulating the supplemental light spectrum. The use of artificial light can be extended to stresses.

Importance of FaWRKY71 in Strawberry (Fragaria × ananassa) Fruit Ripening

“…For tissue culture seedlings, the relative expression of FaWRKY71 was significantly up-regulated under blue light treatment for 8 h, 16 h, 32 h and red light treatment for 8 h. Indicating that there are differences in the response patterns of FaWRKY71 to different light qualities in strawberry fruits and tissue culture seedlings. It has been reported that different light quality had different effects on plant growth and fruit coloring [ 28 , 29 ]. For example, blue and red light could promote anthocyanin accumulation in ‘Toyonoka’ strawberry fruit, but had no obvious effect on ‘Tokun’ fruit [ 27 , 30 ].…”

Chlorophyll a fluorescence as a tool to monitor physiological status in the leaves of Artemisia ordosica under root cutting conditions

“…Owing to the summer season in China during which we conducted the present field monitoring, light intensity was substantially increased at times closer to noon, which resulted in lower O step, J step, I step, and P step values of the leaf OJIP curve. This may have been related to the closure of leaf stomata caused by excessive light intensity ( Luo et al., 2016 ), high temperature ( Shamsabad et al., 2022b ), and/or increased evaporative of water from leaves ( Liu et al., 2020 ). Therefore, in the process of field experiments, leaf selection should strive to select leaves that are under the same lighting conditions and that the degree of leaf development is as consistent as possible.…”

Underlying Mechanisms of Action to Improve Plant Growth and Fruit Quality in Crops under Alkaline Stress

“…Likewise, a decrease in gas exchange rates (reduced transpiration, stomatal conductance, and CO 2 assimilation) can occur, reducing the maximum quantum yield of PSII primary photochemistry (φPo) and causing an increase in PSII energy dissipation and inhibiting PSII electron transport. This environment leads to overproduction and overaccumulation of ROS, mainly hydrogen peroxide (H 2 O 2 ), hydroxyl ions (OH • ), singlet oxygen ( 1 O 2 ) [47], and superoxide radicals (O 2…”

“…In blueberry "Jewel" (Vaccinium corymbosum) plants, a reduction in H + flux from the root was documented, which may be associated with inhibition of the VcHA gene encoding H + -ATPases derived from the alkaline condition, pH 8.0 [59]. In strawberry plants, increased Na + absorption was observed, accompanied by a decrease in K + ,Ca 2+ ,Mg 2+ , and Fe, which negatively affected fruit color [47]. In Ricinus communis L. seeds exposed to 50, 100, and 150 mM NaHCO 3 , the germination rate was reduced by an increase in Na + content and reduction in K + [60].…”