SlSPS, a Sucrose Phosphate Synthase Gene, Mediates Plant Growth and Thermotolerance in Tomato

Heat stress (HS) has been considered as a severe threat to crop yields in recent years. Sucrose, major product of photosynthesis, plays an important role plant growth and response. Sucrose phosphate synthase (SPS) is key rate-limiting enzyme the sucrose synthesis pathway plants. However, its molecular mechanism signaling remain unclear. In this study, we identified novel SPS gene (SlSPS) tomato generated over-expression knock-out SlSPS transgenic plants investigate biological functions related thermotolerance tomato. Over-expression increased biomass plants, such fresh weight, dry height, fruit weight root length. contrast, decreased Under heat stress, survival rates were positively correlated with expression level different varieties. Furthermore, SlSPS-overexpressing showed higher activity content resistant phenotypes. By comparison, lower susceptible stress. The determination several reference values oxidative parameters also consistent their resistance these summary, could mediate