Canopy development and hydraulic function in Eucalyptus tereticornis grown in drought in CO2 -enriched atmospheres

Functional Plant Biology : FPB
Brian J AtwellJann P Conroy

Abstract

We report on the relationship between growth, partitioning of shoot biomass and hydraulic development of Eucalyptus tereticornis Sm. grown in glasshouses for six months. Close coordination of stem vascular capacity and shoot architecture is vital for survival of eucalypts, especially as developing trees are increasingly subjected to spasmodic droughts and rising atmospheric CO2 levels. Trees were exposed to constant soil moisture deficits in 45 L pots (30-50% below field capacity), while atmospheric CO2 was raised to 700 μL CO2 L-1 in matched glasshouses using a hierarchical, multi-factorial design. Enrichment with CO2 stimulated shoot growth rates for 12-15 weeks in well-watered trees but after six months of CO2 enrichment, shoot biomasses were not significantly heavier (30% stimulation) in ambient conditions. By contrast, constant drought arrested shoot growth after 20 weeks under ambient conditions, whereas elevated CO2 sustained growth in drought and ultimately doubled the shoot biomass relative to ambient conditions. These growth responses were achieved through an enhancement of lateral branching up to 8-fold due to CO2 enrichment. In spite of larger transpiring canopies, CO2 enrichment also improved the daytime water stat...Continue Reading

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Citations

May 17, 2011·Tree Physiology·Remko A DuursmaRoss E McMurtrie
Dec 14, 2011·The New Phytologist·Melanie J B ZeppelDavid T Tissue
Jan 3, 2018·PloS One·Shannon DillonElizabeth Pinkard
May 22, 2019·Ecology and Evolution·Melanie J B ZeppelStephen W Pacala
Jan 27, 2021·The New Phytologist·Mingkai JiangBelinda E Medlyn
Jul 8, 2021·Journal of Experimental Botany·Eisrat JahanDavid T Tissue

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