What determines rates of photosynthesis per unit nitrogen in Eucalyptus seedlings?

Functional Plant Biology : FPB
C R Warren, Mark A Adams

Abstract

Species originating from xeric sites are characterised by slower rates of photosynthesis per unit nitrogen (PNUE) than species from mesic sites, but we lack mechanistic explanations for these interspecific differences. We examined N allocation to Rubisco and chlorophyll, and photosynthetic characteristics in seedlings of nine Eucalyptus species grown in a fully sunlit glasshouse with an optimal supply of nutrients. Species were selected from mesic (1800 mm year-1 rainfall) through to semi-arid habitats (300 mm year-1). All species were characterised by allocation of a large proportion of N to Rubisco (32-48%) with high in vivo specific activity. Intercellular CO2 concentration (Ci) varied between 260 and 300 μmol mol-1, and thus, stomatal limitations were low in all species. This combination of traits resulted in a PNUE (172-335 μmol mol-1 s-1) that was higher than is commonly observed in tree species and which may be related to the rapid growth, water-spender strategy of Eucalyptus seedlings. There were significant differences in photosynthetic parameters and N allocation among species, but these were only weakly related to rainfall at the site of seed origin. There were correlations of Ci with PNUE but a sensitivity analysis ...Continue Reading

References

May 29, 2004·Trends in Plant Science·Charles R Warren, Mark A Adams
May 1, 2001·Oecologia·Charles R WarrenMark A Adams
Jun 1, 2004·Functional Plant Biology : FPB·Ian J WrightMark Westoby

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Citations

May 1, 2006·Functional Plant Biology : FPB·Drew J KingIan E Woodrow
Mar 24, 2009·Journal of Experimental Botany·Ulo NiinemetsCharles R Warren

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