Haghighi, M., R. Abolghasemi and JA. Teixeira da Silva.2014. Low and high temperature stress affect the growth characteristics of tomato in hydroponic culture with se and nano-se amendment.Scientia Horticulturae. 178: 231-240.http://www.elsevier.com

Abstract

High and low temperatures are environmental stresses that can damage agricultural crops and limittheir distribution and yield. The objective of this study was to investigate the effect of selenium (Se)and nano-selenium (N-Se) on tomato (Lycopersicum esculentum Mill. cv. ‘Halil’) plant growth in responseto high and low temperature stress since Se is a well-known stress moderator. Se was applied at 0 M(control), 2.5 M (Se1), 5 M (Se2) and 8 M (Se3). Similarly, N-Se was applied at 1 M (N-Se1), 4 M(N-Se2), 8 M (N-Se3) and 12 M (N-Se4). All plants were exposed to optimal temperature (25/17 ± 2◦Cday/night = T1), then to high (24 h at 40◦C = T2) and low (24 h at 10◦C = T3) temperature stress, then placedat optimal conditions for 10 days. Se, when applied at 2.5 M, promoted plant growth after both highand low temperature stress were applied. More specifically, shoot dry weight and diameter increasedin T2, shoot fresh weight, dry weight and diameter increased in T3, and root fresh weight, dry weightand root volume increased in T2 and T3. N-Se had no effect on plant growth. In T3, Se1 increased thechlorophyll content of leaves by 19.2% while N-Se1 improved it by 27.5%. Root volume increased 33.3%after treatment with Se1 in T2 and by 60% in T3. Se and N-Se increased relative water content after T2and T3 stress. Thus, Se and N-Se can improve select tomato plant growth parameters after a short-termpulse of high and/or low temperature stress.