Abstract

ZAZUETA-TORRES, Norma Delia et al. Quality of light from fluorescent lamps in cucumber growth and severity of Oidium sp. Rev. Mex. Cienc. Agríc [online]. 2022, vol.13, n.6, pp.977-989.  Epub Feb 24, 2023. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v13i6.2800.

The quality of light affects the development of plants, due to the specific effects on photosynthesis, photomorphogenesis and other physiological and biochemical processes. It also has an important role in plant-pathogen interactions and controls various metabolic activities of fungi that determine their pathogenicity and severity. Three experiments were carried out under completely randomized designs to know the influence of fluorescent lamps of cool, neutral and warm white light, on the morphology and growth of cucumber plants (Cucumis sativus L.) and the severity of powdery mildew (Oidium sp.). In the growth chambers used, the photosynthetic photon flux density (PPFD) averaged 305 μmol m-2 s-1, but the spectral parameters related to red light (R:WWL> NWL> CWL) and blue light (B:CWL> NWL> WWL) were contrasting. The highest absolute amount of light R (122.04 μmol m-2 s-1), relative amount of R:PPFD (40.09%) and proportional amount of R:B (2.67) and R:FR (3.25) of WWL promoted greater height, leaf area, fresh and dry weight of leaves, stem and root of plants, while the greater absolute amount of light B (84.19 μmol m-2 s-1), relative amount of B:PPFD (27.48%) and proportional amount of B:R (1.04) and B:FR (2.65) of CWL induced lower plant height and greater stem thickness and leaf greenness index. The spectral parameters of CWL also disturbed the development of Oidium sp., which was reflected in less severity of powdery mildew compared to NWL or WWL.

Keywords : Cucumis sativus L.; blue light; powdery mildew; red light..

        · abstract in Spanish     · text in English | Spanish     · English ( pdf ) | Spanish ( pdf )