Low temperature perturbs hydraulic and hormonal regulation of leaf expansion and photosynthesis of soybean seedlings

ROTHWELL, S.A. ; DODD, I.C.; ANTONIETTA, M.; BORRÁS, L.; DE FELIPE, M. ; RUFINO, M.C.

Sevilla

Congreso; XVI European Society for Agronomy Congress; 2020

European Society for Agronomy

Cold temperatures (T) during the early growing stages of soybean represent a main constraint for expansion of this crop towards higher latitudes. Chilling reduces root hydraulic conductivity thus limiting leaf expansion and photosynthesis, but whether endogenous hormone concentrations regulate genotypic variation in these traits under low T is uncertain. Following an initial low T screening of 18 European soybean cultivars, 6 were grown in controlled environments at Lancaster University, UK. From sowing, plants were grown under low (L, 14 °C), or high (H, 24°C) temperatures until the tip of unifoliate leaf appeared, when half were either maintained at their original T or swapped, to result in 4 treatments (LL, LH, HL, and HH). Significant (P