关键词: 番茄, 幼苗, 根际降温, 生理机能

Abstract: In order to explore the physiological and biochemical mechanism of tomato seedling
growth promoted by root-zone cooling，tomato（Solanum lycopersicum）seedlings were cultivated in
cooling bed and non-cooling bed as control. Plant root morphological traits，nutrient uptake and
physiological characteristics of tomato seedlings were tested. The results showed as follows：Root surface
area，root activity（sap flow velocity and root respiration rate）and nutrient uptake of tomato seedlings were
improved significantly. Compared with the control bed treatment，shoot N，Ca and Mg contents of tomato
seedling in cooling bed were significantly higher，but root P，Ca and Mg contents were lower. Antioxidant
ability both in root and leaf of tomato seedling were promoted by root-zone cooling. This study indicated
that root-zone cooling by cooling bed with cold water could alleviate high air temperature injury for
intensive seedling production in summer.

Key words: tomato, seedling, root-zone cooling, physiological mechanism