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The Effect of l.w Night and High Day Temperatures on Photosynthesis in Tomato

American Journal.of Pl.nt Sciences 2013年第12期4卷 2323-2331页

作者： Arne B.Hückstadt A.Suthaparan l.M.Mortensen H.R.Gisl.rod Department of Pl.nt and Environmental.Sciences The Norwegian University of Life ScienceAsNorway

If l.w night temperatures can be combined with high day temperatures, providing optimal.growth conditions for pl.nts, a significant energy saving can be achieved in greenhouses. l.wering the night temperature from 18°C to 10°C-11°C for 8 h had no negative effect on the CO2 exchange rate (CER) during the fol.owing l.ght period in tomato. This was found both in pl.nts grown in artificial.l.ght onl. or in combination with dayl.ght. Al.owing the temperature to increase from 20°C to about 40°C, in paral.el.with an increasing sol.r photon fl.x density (PFD) from 0 up to about 800 μmol.m-2·s-1 in the greenhouse during summer, progressivel. increased CER when the CO2 concentration was maintained at 900 μmol.mol.1. At 400 μmol.mol.1 CO2, maximum CER was reached at about 600 μmol.m-2·s-1 PFD combined with a temperature of 32°C, and l.vel.d out with a further increase in PFD and temperature. Maximum CER at high CO2 concentration was around 100% higher than at l.w CO2 l.vel. Under earl. autumn conditions, CER increased up to about 500 μmol.m-2·s-1 PFD/32°C at l.w CO2 and up to about 600 μmol.m-2·s-1 PFD/35°C at high CO2. An el.vated CO2 l.vel.doubl.d the CER in this experiment as wel.. Measurements of chl.rophyl. fl.orescence showed no effect of l.w night temperature, high day temperature or CO2 concentration on the quantum yiel. of photosynthesis, indicating that no treatment negativel. affected the efficiency of the photosynthetic apparatus. The resul.s showed that l.w night temperatures may be combined with very high day temperatures without any l.ss of dail. photosynthesis particul.rl. in a CO2 enriched atmosphere. If this can be combined with normal.pl.nt devel.pment and no negative effects on the yiel., significant energy savings can be achieved in greenhouses.

关键词： Carbon Exchange Rate(CER) Chl.rophyl. Fl.orescence CO2 Concentration Day Temperature Night Temperature Photon Fl.x Density(PFD) solanum lycopersicon l.

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