Effect of different light spectra on morpho-physiological and biochemical characteristics of marigold (Calendula officinalis L.) under salinity stress

Utilizing complementary light spectra represents a potential novel approach for examining the enhancement of plant resilience amidst stressful conditions. The objective of this study was to explore the impact of various complementary light spectra on the growth and development of marigold plants under salinity-induced stress. The plants were cultivated in a greenhouse and exposed to blue, red, blue/red (۲:۱), blue/red (۱:۲), and white/yellow illumination throughout their growth stages. Stress conditions comprised control (non-stress) and salinity treatments (۳۰, ۶۰, and ۹۰ mM NaCl). Salinity stress led to a reduction in fresh and dry weights, as well as leaf area index, while increasing proline content and Na concentration in roots and shoots. The combination of blue and red spectra caused superior stress mitigation compared to other spectra. Salinity stress reduced leaf chlorophyll and RWC, however, blue/red (۲:۱) treatment enhanced both parameters under NaCl stress. Salinity also increased the amount of total phenol content. White/yellow light exerted the most pronounced effect in reducing total phenol content at ۹۰ mM salinity. Sodium uptake increased under stress, while potassium uptake decreased. The sentence was corrected. It can be concluded that the effects of salinity stress can be reduced by manipulating the supplemental light spectrum. The use of artificial light can be extended to stress.

کلیدواژه ها:

Ion Concentration ، Leaf gas exchange ، Light quality ، Photosynthesis ، Relative Water Content ، Ion Concentration ، Leaf gas exchange ، Light quality ، Photosynthesis ، Relative Water Content