Effect of respiratory homeostasis on plant growth in cultivars of wheat and rice

K. Kurimoto, D.A. Day, Hans Lambers, K. Noguchi

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    Some plants have the ability to maintain similar respiratoryrates (measured at the growth temperature), even whengrown at different temperatures, a phenomenon referred toas respiratory homeostasis. The underlying mechanismsand ecological importance of this respiratory homeostasisare not understood. In order to understand this, root respirationand plant growth were investigated in two wheatcultivars (Triticum aestivumL. cv. Stiletto and cv. Patterson)with a high degree of homeostasis, and in one wheatcultivar (T. aestivumL. cv. Brookton) and one rice cultivar(Oryza sativaL. cv. Amaroo) with a low degree of homeostasis.The degree of homeostasis (H) is defined as a quantitativevalue, which occurs between 0 (no acclimation) and1 (full acclimation). These plants were grown hydroponicallyat constant 15 or 25∞C. A good correlation wasobserved between the rate of root respiration and the relativegrowth rates (RGR) of whole plant, shoot or root. Theplants with high H showed a tendency to maintain theirRGR, irrespective of growth temperature, whereas theplants with low H grown at 15∞C showed lower RGR thanthose grown at 25∞C. Among several parameters of growthanalysis, variation in net assimilation rate per shoot mass(NARm) appeared to be responsible for the variation inRGR and rates of root respiration in the four cultivars. Theplants with high H maintained their NARmat low growthtemperature, but the plants with low H grown at 15∞Cshowed lower NARmthan those grown at 25∞C. It is concludedthat respiratory homeostasis in roots would help tomaintain growth rate at low temperature due to a smallerdecrease in net carbon gain at low temperature. Alternatively,growth rateper semay control the demand of respiratoryATP, root respiration rates and sink demands ofphotosynthesis. The contribution of nitrogen uptake tototal respiratory costs was also estimated, and the effectsof a nitrogen leak out of the roots and the efficiency ofrespiration on those costs are discussed.
    Original languageEnglish
    Pages (from-to)853-862
    JournalPlant, Cell and Environment
    Publication statusPublished - 2004


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