Plant Biol (Stuttg) 2021 Apr 26. Epub 2021 Apr 26.
College of Horticulture, Northwest A&F University, Yangling, 71210, China.
Low temperature (LT) and high humidity (HH) are important environmental factors in green house and plastic tunnel during cold season that hamper plant growth and development. Here, we studied the effect of LT (day/night: 9/5°C with 25/18°C as the control) and HH (95% with 80% as the control) on cucumber young plants at 2, 4 or 6 leaf stage. LT and HH stress resulted in decline of shoot, root and total fresh and dry weight, and decreased net photosynthesis (Pn), stomatal conductance (Gs), transpiration rate (Tr), photochemical efficiency (Fv/Fm), photochemical quenching (qP), electron transport rate (ETR) and chlorophyll pigments, and increased malondialdehyde (MDA), hydrogen peroxide (H O ), superoxide (O ), non-photochemical quenching coefficient (NPQ) and intercellular CO rate (Ci) as compared to the control at 2 leaf stage. Read More