Effects of High Temperature and Different Air Humidity on Water Physiology of Flowering Tomato Seedlings

doi:10.3969/j.issn.1000-6362.2019.05.006

Abstract

Abstract:

Used tomato variety “Jinguan 5” as the test material, and orthogonal test was carried out in the artificial climate chamber to design the daily maximum temperature(℃)/lowest temperature(℃). For the 32/22℃, 35/25℃, 38/28℃, 41/31℃ levels, the relative humidity of the air is 3 levels: 50%±5%, 70%±5%, 90%±5%, and the treatment days is 3, 6, 9, 12 days, and set 28/18℃, 50%±5% as control (CK), the changes of physiological indices of tomato under different treatments were determined. The results showed that under the high temperature treatment of 32?41℃, the stomatal conductance (Gs) and transpiration rate (Tr) were the highest at 35℃, respectively, 0.109μmol·m-2·s-1, 0.21μmol·m-2·s-1; leaf water potential (ψw), root system vigorous (Rv), root-shoot ratio (R/S), net photosynthetic rate (Pn) and water use efficiency (WUE) decreased with increasing stress temperature, and decreased by 163.76%, 66.63%, 28.59%, 73.90% and 65.11% at 41℃ compared with CK. After increasing the humidity to 70% under high temperature conditions, ψw, Gs, Pn, Tr and WUE were significantly improved compared with 50% treatment and can basically recover to CK level within 28 days, the root system also recovered better and maintained a higher WUE during the recovery period; but after increased the humidity to 90%, Gs and ψw increased, but Pn, Rv, R/S, WUE failed to increase significantly, and WUE was lower during the recovery period. Therefore, in the high temperature environment of 35℃ and above, increasing the humidity of the air to 70% can effectively reduce the damage of high temperature to tomato, and it was also conducive to tomato recovery. This study provides a theoretical basis for the optimal management of summer greenhouse tomato.

Key words: Tomato, High temperature and high humidity, Post-disaster recovery, Stomatal conductance, Water use efficiency

WEI Ting-ting, YANG Zai-qiang, WANG Ming-tian, ZHAO He-li, ZHAGN Xu-ran, LI Jia-shuai, SUN Qing, WANG Lin. Effects of High Temperature and Different Air Humidity on Water Physiology of Flowering Tomato Seedlings[J]. Chinese Journal of Agrometeorology, 2019, 40(05): 317-326.

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