Effects of Difference between Day and Night Temperature on Photosynthesis Mechanism of Tomato Seedlings

doi:10.3969/j.issn.1000-7091.2012.01.024

Abstract

Abstract: To understand the mechanism of effects of temperature difference between day and night on photosynthesis of tomato seedlings, two experiments were carried outwith climate box(SPX-250IC) under the average temperature of 20℃ in April and May, 2010. Day/night temperature were 20℃/20℃, 23℃/17℃ and 26℃/14℃, and difference between DT and NT were 0, 6 and 12℃. The results showed that net photosynthetic rate(Pn), single leaf area, contents of chlorophyll and dry matter accumulation were increased with the increasing of difference between day and night temperature, while average of 24h air temperature was uniform. Area of single leaf increased 30. 3% ～ 47. 1%, Pn increased 87. 5% ～ 12. 6%, a nd dry weight increased 48. 8% ～ 55. 7% under 26℃/14℃ than that of 20℃/20℃. Meanwhile, stomata conductance(Gs) and Ls increased greatly, but intercellular CO₂ concentration(Ci) decreased greatly under 26℃/14℃ than that of 20℃/20℃. Pn, leaf area and dry weight of tomato seedlings increased under 23℃/17℃ than that of 20℃/20℃, too. It was suggested that limiting factors of non-stomata of tomato seedlings reduced, photosynthesis and accumulation of matter increased, single leaf area and chlorophyll contents increased under 26℃/14℃ compared with that of 20℃/20℃.

Key words: Difference between day and night temperature, Tomato seedlings, Photosynthetic characteristics, Accumulation of matter

CLC Number:

S641.2

MAO Li-ping, LI Ya-ling, ZHAO Jun-liang, ZHANG Jian-guo, WU Dong-tang. Effects of Difference between Day and Night Temperature on Photosynthesis Mechanism of Tomato Seedlings[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2012, 27(1): 128-133. doi: 10.3969/j.issn.1000-7091.2012.01.024.

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