Water stress impacts on respiratory rate, efficiency and substrates, in growing and mature foliage of Eucalyptus spp

Planta
Andrew N Callister, Mark A Adams

Abstract

In previous studies, water stress has induced variable and sometimes contradictory changes in respiration. We used isothermal calorimetry to measure the response of foliar respiration to water deficit in nine eucalypt genotypes. Specific growth rates (R(SG)) of shoots and leaves of variable age were measured independently, and the data were applied to both the growth-maintenance and enthalpy balance models. We calculated the oxidation state of respiratory substrate and the enthalpy change for the conversion of substrate carbon to biomass (DeltaH(B)). Moderate water stress reduced the R(SG) of shoots by 38% (P<0.01) and carbon conversion efficiency by 15% (P<0.05). The relationship between carbon conversion efficiency and R(SG) was not affected by water deficit for shoots, but was significantly altered for leaves. Water deficit increased maintenance respiration by about 23% (P<0.001). The growth coefficient of respiration was not significantly altered. However, changes in oxidation states of substrate and biomass suggest that the energy requirements of biosynthesis were increased under water stress. Our results confirm that carbohydrates are the major respiratory substrates in growing tissues, though mature leaves utilized a sub...Continue Reading

References

Jun 1, 1974·Journal of Theoretical Biology·F W Penning de VriesH H van Laar
Jan 17, 2003·Plant Physiology·Guillaume TcherkezJaleh Ghashghaie
Jul 25, 2003·Trends in Plant Science·Owen K Atkin, Mark G Tjoelker
Aug 30, 2005·Plant Physiology·Miquel Ribas-CarboJaume Flexas
Dec 1, 1979·Plant Physiology·R J CookeD D Davies
Oct 1, 2004·Functional Plant Biology : FPB·Sannali MathesonLee D Hansen

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Citations

Oct 17, 2009·American Journal of Therapeutics·Zafar H Israili
Dec 3, 2014·Methods : a Companion to Methods in Enzymology·Lars Wadsö, Lee D Hansen
Jun 17, 2008·Annals of Botany·Owen K Atkin, David Macherel
Dec 29, 2019·Global Change Biology·Dushan P KumarathungeBelinda E Medlyn

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