Effects of Low Night Temperature on Photosynthesis of Tomato Seedlings

ACTA HORTICULTURAE SINICA ›› 2006, Vol. 33 ›› Issue (4): 757-761.

• 研究论文 • Previous Articles Next Articles

Effects of Low Night Temperature on Photosynthesis of Tomato Seedlings

Wang Lijuan^{1, 2};Li Tianlai¹;Li Guoqiang¹;Qi Hongyan¹

( ¹College of Horticulture, Key Laboratory of Protected Horticulture of Liaoning Province, Shenyang Agricultural University,Shenyang, Liaoning 110161, China; ²Department of Horticulture, Tianjin Agricultural College, Tianjin 300384, China)

Received:2005-11-14 Revised:2006-04-28 Online:2006-08-25 Published:2006-08-25

Abstract

Abstract: Effects of different low night temperature (12℃, 9℃, 6℃, and 15℃ as control) on photosynthesis and chlorophyll fluorescence characteristics were investigated in tomato seedlings . Results showed that the dry matter accumulation of plants was restrained under low night temperature. Total chlorophyll content and net photosynthetic rate decreased. The stomatal conductance (Gs) , intercellular CO₂ concentration (Ci) , transpiration rate ( Tr) decreased but the stomatal limitation (Ls) increased in comparison with the
control. The photosynthetic rate and related factors could be resumed to normal standard after 10 days treatment of 12℃and 9℃. Photosynthetic related factors could be recovered, but the net photosynthetic rate could
not resumed at 6℃. This indicated that the low photosynthetic rate was not related to Gs, Ci, Tr and Ls during the recovery period after 6℃ treatment. Fv/Fm, ΦPSⅡ , ETR were not significantly affected under low night temperature, because all of them could be recovered soon after released from low night temperature stress. The results indicated that PSⅡ of tomato seedlings was not damaged under the low night temperature and the period of treatment within the designed experiments.

Key words: Tomato, Lycopersicon esculentum, Low night temperature, Photosynthesis, Chlorophyll fluorescence

Wang Lijuan;;Li Tianlai;Li Guoqiang;Qi Hongyan. Effects of Low Night Temperature on Photosynthesis of Tomato Seedlings[J]. ACTA HORTICULTURAE SINICA, 2006, 33(4): 757-761.

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Effects of Low Night Temperature on Photosynthesis of Tomato Seedlings

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