Components of transpiration efficiency in poplars : genetic diversity, stability with age and scaling from leaf to whole plant level

Abstract : Up scaling approach was developed to check whether genotype differences in Δ13C represent the differences in transpiration efficiency at leaf and whole plant scale. We also verified the stability genotype difference in Δ13C with age. We found that genotype differences in Δ13C were as such translated as the difference in transpiration efficiency at both leaf and whole plant scale. Magnitude of variability of whole plant transpiration efficiency was higher as compared to at leaf level highlighting the role of carbon lost during photo and dark respiration (Φc) and water lost during night transpiration (Φw). Genotype productivity increased with increase in transpiration efficiency in Populus deltoides × nigra genotypes but remained unchanged in Populus nigra genotypes. Values of whole plant transpiration efficiency were found higher as compared to other species.18O enrichment in both leaf bulk (Δ18Olb) and leaf water (Δ18Olw) reflected variation in stomatal conductance (gs) either at individual level or at genotypic level. In Populus deltoides × nigra genotypes, no increase or decreasing trend was found in Δ13C between the age of 5-15 years and genotypic ranking was conserved over the tested period. However, significantly lower Δ13C values were evidenced between the age of 4-7, which increased with age. We conclude that in poplar, Δ13C is a reliable estimator of whole plant transpiration efficiency and the ranking made in young plant for Δ13C remain stable with age.
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Fahad Rasheed. Components of transpiration efficiency in poplars : genetic diversity, stability with age and scaling from leaf to whole plant level. Silviculture, forestry. AgroParisTech, 2012. English. ⟨NNT : 2012AGPT0055⟩. ⟨pastel-01057801⟩

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