Effects of High Temperature and Different Air Humidity on Growth and Senescence Characteristics for Tomato Seedlings

doi:10.3969/j.issn.1000-6362.2017.12.002

Abstract

Abstract: To understand the effects of high temperature (HT) and relative humidity (RH) on tomato growth, a controlled experiment for tomato (Solanum lycopersicum L., cv. Jinfen 5) was conducted in Nanjing University of Information Science and Technology in 2016. The HT was maintained at 35℃/18℃(day/night), 38℃/18℃, and 41℃/18℃, the RH was set at 50%±5%, 70%±5%, and 90%±5%, and 28℃/18℃ and 45%-55% was took as control (CK), all treatments lasted for 3d, 6d, and 9d. The results showed that the daily growth rate of plant height, stem diameter, and SOD increased at first and then decreased, while the daily growth rate of leaf area, chlorophyll a and b, POD, and CAT decreased when day temperature was 35-41℃. The growth of tomato under 35℃ and 38℃ was similar to that of CK, while the daily growth rate of plant height, stem diameter, leaf area, chlorophyll a and b decreased by 58%, 49%, 18%, 13.2%, and 10.2% compared to CK under 41℃. The plant height, stem diameter, leaf area, chlorophyll a and b, SOD, and CAT under the treatment of 70%±5% RH were higher than that of 50%±5% and 90%±5% RH at the same temperature. There was no significant difference among different days. The results indicated that when the day temperature of greenhouse was 35-41℃ in summer, 70%±5% RH could effectively relieve the harm of HT stress on tomato. The range analysis showed that HT was the main factor affected growth and senescence for tomato, and RH was the secondary factor. The variance analysis showed that the interaction of HT and RH impacted significantly growth and senescence for tomato.

Key words: Tomato, High temperature and high humidity, Orthogonal test, Growth, Senescence characteristics

WANG Lin, YANG Zai-qiang, YANG Shi-qiong, LI Jun, LI Kai-wei, HOU Meng-yuan. Effects of High Temperature and Different Air Humidity on Growth and Senescence Characteristics for Tomato Seedlings[J]. Chinese Journal of Agrometeorology, 2017, 38(12): 761-770.

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