High nitrogen and elevated [CO₂] effects on the growth, defense and photosynthetic performance of two eucalypt species
2012
Novriyanti, Eka | Watanabe, Makoto | Kitao, Mitsutoshi | Utsugi, Hajime | Uemura, Akira | Koike, Takayoshi
Atmospheric nitrogen deposition and [CO₂] are increasing and represent environmental problems. Planting fast-growing species is prospering to moderate these environmental impacts by fixing CO₂. Therefore, we examined the responses of growth, photosynthesis, and defense chemical in leaves of Eucalyptus urophylla (U) and the hybrid of E. deglupta × E. camadulensis (H) to different CO₂ and nitrogen levels. High nitrogen load significantly increased plant growth, leaf N, net photosynthetic rate (Agᵣₒwₜₕ), and photosynthetic water use efficiency (WUE). High CO₂ significantly increased Agᵣₒwₜₕ, photosynthetic nitrogen use efficiency (PNUE) and WUE. Secondary metabolite (SM, i.e. total phenolics and condensed tannin) was specifically altered; as SM of U increased by high N load but not by elevated [CO₂], and vice versa for SM of H.
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