Diel- and temperature-driven variation of leaf dark respiration rates and metabolite levels in rice

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http://hdl.handle.net/10138/329958

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Rashid , F A A , Scafaro , A P , Asao , S , Fenske , R , Dewar , R , Masle , J , Taylor , N L & Atkin , O K 2020 , ' Diel- and temperature-driven variation of leaf dark respiration rates and metabolite levels in rice ' , New Phytologist , vol. 228 , no. 1 , pp. 56-69 . https://doi.org/10.1111/nph.16661

Title: Diel- and temperature-driven variation of leaf dark respiration rates and metabolite levels in rice
Author: Rashid, Fatimah Azzahra Ahmad; Scafaro, Andrew P.; Asao, Shinichi; Fenske, Ricarda; Dewar, Roderick; Masle, Josette; Taylor, Nicolas L.; Atkin, Owen K.
Contributor: University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2020-10
Language: eng
Number of pages: 14
Belongs to series: New Phytologist
ISSN: 0028-646X
URI: http://hdl.handle.net/10138/329958
Abstract: Leaf respiration in the dark (R-dark) is often measured at a single time during the day, with hot-acclimation lowering R-dark at a common measuring temperature. However, it is unclear whether the diel cycle influences the extent of thermal acclimation of R-dark, or how temperature and time of day interact to influence respiratory metabolites. To examine these issues, we grew rice under 25 degrees C : 20 degrees C, 30 degrees C : 25 degrees C and 40 degrees C : 35 degrees C day : night cycles, measuring R-dark and changes in metabolites at five time points spanning a single 24-h period. R-dark differed among the treatments and with time of day. However, there was no significant interaction between time and growth temperature, indicating that the diel cycle does not alter thermal acclimation of R-dark. Amino acids were highly responsive to the diel cycle and growth temperature, and many were negatively correlated with carbohydrates and with organic acids of the tricarboxylic acid (TCA) cycle. Organic TCA intermediates were significantly altered by the diel cycle irrespective of growth temperature, which we attributed to light-dependent regulatory control of TCA enzyme activities. Collectively, our study shows that environmental disruption of the balance between respiratory substrate supply and demand is corrected for by shifts in TCA-dependent metabolites.
Subject: 114 Physical sciences
AMINO-ACID
ARABIDOPSIS-THALIANA
CARBON
ELEVATED ATMOSPHERIC CO2
GROWTH
NIGHTTIME RESPIRATION
PLANT RESPIRATION
STARCH TURNOVER
THERMAL-ACCLIMATION
TRICARBOXYLIC-ACID CYCLE
amino acids
diel cycle
growth temperature
leaf dark respiration
metabolites
rice
sugars
tricarboxylic acid (TCA) cycle
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