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Effects of low temperature, weak light and high humidity stresses on the physiological and biochemical indicators of greenhouse tomato during flowering period.

ZHANG Shu-jie1, YANG Zai-qiang2, CHEN Yan-qiu3**, HAN Xiu-jun4, WU Man-li4, ZHAO Xian-li1, LI Guang-xia4   

  1. (1Institute of Atmospheric Environment in Shenyang, CMA, Shenyang 110166, China; 2Nanjing University of Information Science & Technology, Nanjing 210044, China; 3Liaoning Meteorological Bureau, Shenyang 110001, China; 4Shenyang Central Meteorological Observatory, Shenyang 110166, China)
  • Online:2014-11-10 Published:2014-11-10

Abstract: In order to study the physiological mechanism of the effects of low temperature, weak light and high humidity stresses on tomato in winter in Northeast China, a tomato cultivar ‘Liangfen 2’ was selected as experimental material, and four levels of low temperature (5-2-4 ℃; 5-1-3 ℃; 5-0-2 ℃; 5-(-1)-1 ℃), weak light \[0 (2 days)-400 μmol·mol-1\] and high humidity (70%-95%) were installed in a climatic chamber to study their effects on maximum net photosynthesis rate, chlorophyll fluorescence parameters and antioxidant enzyme activities. Results showed that the original light conversion efficiency of the PSII and its potential activity were reduced under low temperature, weak light and high humidity stresses. In addition, the maximum net photosynthesis rate (Pmax), photochemical maximum efficiency of PSⅡ (Fv/Fm), potential activities of PSⅡ (Fv/F0) and photochemical quenching coefficient (qP) decreased with the decline of temperature and the extension of the duration of low temperature. At the same time, nonphotochemical quenching coefficient (qN) increased along with the decline of temperature, while the activity of superoxide dismutase (SOD) and the content of malondialdehyde (MDA) increased simultaneously. After the temperature recover, Pmax, Fv/Fm, Fv/F0, qP and the content of MDA increased, while nonphotochemical quenching coefficient (qN) and SOD activity decreased. All the physiological and biochemical indicators did not recover to the first day’s level except Pmax of treatments 1 and 2. Meanwhile, the physiological and biochemical indicators did not return to CK levels. Our results suggested that temperature below 5 ℃, weak light and high humidity stresses damaged the tomatoes. Therefore, we concluded when temperature declined to 5 ℃ or below 5 ℃ and the duration reached 3 days, as well as the minimum temperature reached 0 ℃, the freezing injury would happen to tomato.

Key words: genetic structure, genetic diversity, COI gene, South China, Hemibarbus medius, ND5 gene, Hemibarbus labeo