Chinese Journal of Agrometeorology ›› 2018, Vol. 39 ›› Issue (05): 304-313.doi: 10.3969/j.issn.1000-6362.2018.05.002

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Effect of Air Humidity on Nutrient Content and Dry Matter Distribution of Tomato Seedlings under High Temperature

WANG Lin, YANG Zai-qiang, WANG Ming-tian, YANG Shi-qiong, CAI Xia, ZHANG Jie   

  1. 1.Jiangsu Provincial Key Laboratory of Agrometeorology/Nanjing University of Information Science & Technology, Nanjing 210044, China; 2. Sichuan Meteorological Bureau, Chengdu 610071;3.Hohai University, Nanjing 210098
  • Online:2018-05-20 Published:2018-05-19

Abstract: Took tomato variety of ‘Jinfen5’ as material, the experiment was conducted in Venlo greenhouse of Nanjing University of Information Science and Technology from April to September in 2016. The temperature was maintained at 41℃/18℃(day/night), the humidity (daytime) was set at 50%, 70%, and 90%(±5 percent points), and 28℃/18℃ and 45%?55% was took as control (CK), to determine the effects of different treatments on the distribution of nutrients and dry matter in different organs of plants. The results showed that the contents of soluble sugar and free amino acids in different organs of tomato seedlings were significantly higher than those under normal temperature and humidity conditions (CK) at high temperature, but the protein content was significantly lower than CK(P<0.05) .When the humidity was increased to above 70%, the content of soluble sugar in various organs of tomato seedlings decreased, and the higher the humidity was, the lower the content of soluble sugar was in different air humidity treatments, the differences of treatments were obvious(P<0.05). The contents of free amino acids and soluble proteins in different organs of tomato seedlings were as follows, the higher the air humidity, the higher the contents of free amino acids and soluble proteins. The proportion of dry matter in tomato seedling leaves increased, the proportion of dry matter in stems and roots decreased at high temperature, and the lower the humidity, the greater the difference with CK. The proportion of dry matter in stems and roots decreased significantly(P<0.05), it was extremely unfavorable to plant growth under 50% humidity. After the high temperature stress was relieved, 70% and 90% of humidity treated tomatoes had higher recovery ability, and the ratio of nutrient and dry matter allocation of plants returned to CK level on the 12th day during recovery. The results indicated that increasing air humidity to more than 70% can effectively improve the heat resistance and resilience after the high temperature stress on tomato.

Key words: Air relative humidity, High temperature, Tomato, Nutritious substance, Dry substance