Characterization of juvenile and adult leaves of Eucalyptus globulus showing distinct heteroblastic development: photosynthesis and volatile isoprenoids

Plant Biology
Violeta VelikovaI Yordanov

Abstract

Heteroblastic Eucalyptus (Eucalyptus globulus L.) leaves were characterized for their functional diversity examining photosynthesis and photosynthesis limitations, transpiration, and the emission of isoprene and monoterpenes. In vivo and combined analyses of gas-exchange, chlorophyll fluorescence, and light absorbance at 830 nm were made on the adaxial and abaxial sides of juvenile and adult leaves. When adult leaves were reversed to illuminate the abaxial side, photosynthesis and isoprene emission were significantly lower than when the adaxial side was illuminated. Monoterpene emission, however, was independent on the side illuminated and similarly partitioned between the two leaf sides. The abaxial side of adult leaves showed less diffusive resistance to CO(2) acquisition by chloroplasts, but also lower ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activity, than the adaxial leaf side. In juvenile leaves, photosynthesis, isoprene, and monoterpene emissions were similar when the adaxial or abaxial side was directly illuminated. In the abaxial side of juvenile leaves, photosynthesis did not match the rates attained by the other leaf types when exposed to elevated CO(2), which suggests the occurrence of a limitation ...Continue Reading

References

May 5, 2001·Annual Review of Plant Physiology and Plant Molecular Biology·Thomas D Sharkey, Sansun Yeh
Jan 26, 2005·Journal of Experimental Botany·Roland PieruschkaSiegfried Jahnke
Sep 1, 1990·Photosynthesis Research·O van Kooten, J F Snel

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Citations

Jan 24, 2008·Plant Biology·Francesco LoretoJörg-Peter Schnitzler
Sep 15, 2016·Environmental Monitoring and Assessment·Ernesto DeusFrancisco Moreira

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