Temperature and Light Spectrum Differently Affect Growth, Morphology, and Leaf Mineral Content of Two Indoor-Grown Leafy Vegetables

This study was carried out to determine the effect of three commercial LEDs different spectra with or without far red (FR) photons on growth, morphology, and mineral content two leafy vegetables under temperatures (30 °C 21 °C). The greens were ‘Cegolaine’ lettuce (Lactuca sativa) ‘Petite Star’ pak choy (Brassica rapa subsp. Chinensis). In each temperature, there light spectra: blue LED, white LED FR. All lights adjusted a total photon flux density 250 μmol m−2 s−1 at top plant canopy. Results indicated that temperature treatment had significant influence most measured parameters. When increased from 30 °C, shoot fresh dry weights by 30% 53%, respectively, while those approximately 22%. For both species, plants high larger leaf area but lower compared low temperature. spectrum minor no traits. conclusion, 5% FR did not impact yield biomass either crop responses varied species. resulted in differences