Effects of elevated root zone CO2 and air temperature on photosynthetic gas exchange, nitrate uptake, and total reduced nitrogen content in aeroponically grown lettuce plants.

Journal of Experimental Botany
Jie HeSing Kong Lee

Abstract

Effects of elevated root zone (RZ) CO(2) and air temperature on photosynthesis, productivity, nitrate (NO(3)(-)), and total reduced nitrogen (N) content in aeroponically grown lettuce plants were studied. Three weeks after transplanting, four different RZ [CO(2)] concentrations [ambient (360 ppm) and elevated concentrations of 2000, 10,000, and 50,000 ppm] were imposed on plants grown at two air temperature regimes of 28 degrees C/22 degrees C (day/night) and 36 degrees C/30 degrees C. Photosynthetic CO(2) assimilation (A) and stomatal conductance (g(s)) increased with increasing photosynthetically active radiation (PAR). When grown at 28 degrees C/22 degrees C, all plants accumulated more biomass than at 36 degrees C/30 degrees C. When measured under a PAR >or=600 micromol m(-2) s(-1), elevated RZ [CO(2)] resulted in significantly higher A, lower g(s), and higher midday leaf relative water content in all plants. Under elevated RZ [CO(2)], the increase of biomass was greater in roots than in shoots, causing a lower shoot/root ratio. The percentage increase in growth under elevated RZ [CO(2)] was greater at 36 degrees C/30 degrees C although the total biomass was higher at 28 degrees C/22 degrees C. NO(3)(-) and total reduced N ...Continue Reading

References

Aug 15, 2002·Journal of Experimental Botany·M JeanneauP Perez
Aug 13, 2003·Plant Physiology·Mario GiordanoJohn A Raven
May 1, 1957·Plant Physiology
Aug 11, 2006·Plant, Cell & Environment·Alistair RogersStephen P Long
Feb 1, 2007·Plant, Cell & Environment·Elizabeth A Ainsworth, Alistair Rogers
Mar 1, 1994·Photosynthesis Research·R Pettersson, A J McDonald

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Citations

Apr 8, 2016·Journal of Plant Physiology·Jia-Dong ChangZongsuo Liang
Jun 10, 2018·Physiologia Plantarum·Hiroyuki ShimonoJohn R Evans
Jun 25, 2020·The New Phytologist·Bethany M EldridgeAntony N Dodd

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