科研之友
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摘要
The physiological mechanism of water use efficiency (WUE) remains elucidated, especially in poplar. We studied WUEi (instantaneous leaf transpiration efficiency), WUEL (ratio of unused biomass and water), carbon isotope composition (delta C-13), photosynthetic rates (Pn), stomatal density and stomatal conductance (Gs) in three different, randomly chosen Populusxeuramericana clones: DN-2 (Populus x euramericana), R-270 (Populusxeuramericana) and NE-19 (Populus nigrax(Populusxeuramericana)) under well-watered conditions. The clones had great differences in WUEL, WUEi, delta C-13, stomatal density and Gs. We concluded that, stomatal control was a key factor leading to Pn and WUEi differences and ultimately inducing WUEL and delta C-13 differences. delta C-13 is therefore, a good indicator to use when evaluating WUEL in Populusxeuramericana. We also went further to clone the ERECTA gene, which regulates plant transpiration efficiency in Arabidopsis from Populusxeuramericana. Real-time polymerase chain reaction amplification (PCR) analysis revealed that, PdERECTA may play the same role in Populusxeuramericana as it does in Arabidopsis.
