Differences between rice and wheat in temperature responses of photosynthesis and plant growth

The temperature responses of photosynthesis (A) and growth were examined in rice and wheat grown hydroponically under day/night temperature regimes of 13/10, 19/16, 25/19, 30/24 and 37/31degC. Irrespective of growth temperature, the maximal rates of A were found to be at 30-35degC in rice and at 25-...

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Bibliographic Details
Published in:Plant and cell physiology 2009-04, Vol.50 (4), p.744-755
Main Authors: Nagai, T.(Tohoku Univ., Sendai (Japan)), Makino, A
Format: Article
Language:English
Subjects:
AZOTE
BIOMASA
BIOMASS
Biomass production
BIOMASSE
Chlorophyll - analysis
EFFICACITE
EFFICIENCY
EFICACIA
FOTOSINTESIS
N-use efficiency
NITROGEN
Nitrogen - analysis
NITROGENO
Oryza - growth & development
Oryza - metabolism
ORYZA SATIVA
Oryza sativa L
PHOTOSYNTHESE
PHOTOSYNTHESIS
Plant Leaves - growth & development
Plant Leaves - metabolism
Ribulose-Bisphosphate Carboxylase - analysis
Special Issue – Regular Papers
Species Specificity
TEMPERATURA
TEMPERATURE
Triticum - growth & development
Triticum - metabolism
TRITICUM AESTIVUM
Triticum aestivum L
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Summary:The temperature responses of photosynthesis (A) and growth were examined in rice and wheat grown hydroponically under day/night temperature regimes of 13/10, 19/16, 25/19, 30/24 and 37/31degC. Irrespective of growth temperature, the maximal rates of A were found to be at 30-35degC in rice and at 25-30degC in wheat. Below 25degC the rates were higher in wheat, while above 30degC they were higher in rice. However, in both species, A measured at the growth temperature remained almost constant irrespective of temperature. Biomass production and relative growth rate (RGR) were greatest in rice grown, at 30/24degC and in wheat grown at 25/19degC. Although there was no difference between the species in the optimal temperature of the leaf area ratios (LARs), the net assimilation rate (NAR) in rice decreased at low temperature (19/16degC) while the NAR in wheat decreased at high temperature (37/31degC). For both species, the N-use efficiency (NUE) for growth rate (GR), estimated by dividing the NAR by leaf-N content, correlated with GR and with biomass production. Similarly, when NUE for A at growth temperature was estimated, the temperature response of NUE for A was similar to that of NUE for GR in both species. The results suggest that the difference between rice and wheat in the temperature response of biomass production depends on the difference in temperature dependence of NUE for A.
ISSN:0032-0781
1471-9053
DOI:10.1093/pcp/pcp029