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Molecular and physiological responses during thermal acclimation of leaf photosynthesis and respiration in rice
Author(s) -
Rashid Fatimah Azzahra Ahmad,
Crisp Peter A.,
Zhang You,
Berkowitz Oliver,
Pogson Barry J.,
Day David A.,
Masle Josette,
Dewar Roderick C.,
Whelan James,
Atkin Owen K.,
Scafaro Andrew P.
Publication year - 2020
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.13706
Subject(s) - photosynthesis , respiration , acclimatization , oryza sativa , biology , carbon dioxide , botany , cytochrome c oxidase , sugar , horticulture , zoology , biochemistry , ecology , enzyme , gene
To further our understanding of how sustained changes in temperature affect the carbon economy of rice ( Oryza sativa ), hydroponically grown plants of the IR64 cultivar were developed at 30°C/25°C (day/night) before being shifted to 25/20°C or 40/35°C. Leaf messenger RNA and protein abundance, sugar and starch concentrations, and gas‐exchange and elongation rates were measured on preexisting leaves (PE) already developed at 30/25°C or leaves newly developed (ND) subsequent to temperature transfer. Following a shift in growth temperature, there was a transient adjustment in metabolic gene transcript abundance of PE leaves before homoeostasis was reached within 24 hr, aligning with R dark (leaf dark respiratory CO 2 release) and A n (net CO 2 assimilation) changes. With longer exposure, the central respiratory protein cytochrome c oxidase (COX) declined in abundance at 40/35°C. In contrast to R dark , A n was maintained across the three growth temperatures in ND leaves. Soluble sugars did not differ significantly with growth temperature, and growth was fastest with extended exposure at 40/35°C. The results highlight that acclimation of photosynthesis and respiration is asynchronous in rice, with heat‐acclimated plants exhibiting a striking ability to maintain net carbon gain and growth when exposed to heat‐wave temperatures, even while reducing investment in energy‐conserving respiratory pathways.