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- W1484358065 abstract "ABSTRACT Understanding how water‐use regulation relates to biomass accumulation is imperative for improving crop production in water‐limited environments. Here, we examine how the vulnerability of xylem to water stress‐induced cavitation and the coordination between water transport capacity and assimilation ( A ) influences diurnal water‐use efficiency (WUE) and dry‐matter production in Lolium perenne L. – a commercial forage grass. Plants were exposed to a range of water stresses, causing up to 90% leaf death, by withholding water and then rewatering to observe the recovery process. Leaf hydraulic conductance ( K leaf ) declined to 50% of maximum at a leaf water potential ( ψ leaf ) of −1 MPa, whereas complete stomatal closure occurred well after this point, at −2.35 MPa, providing no protection against hydraulic dysfunction. Instantaneous A remained maximal until >70% of hydraulic conductivity had been lost. Post‐stress rewatering showed that 95% loss of K leaf could be incurred before the recovery of gas exchange exceeded 1 d, with a rapid transition to leaf death after this point. Plants exposed to sustained soil water deficits through restricted nightly watering regimes did not suffer cumulative losses in K leaf ; instead, ψ leaf and gas exchange recovered diurnally. The effect was improved WUE during the day and optimal ψ leaf during the night for the maintenance of growth." @default.
- W1484358065 created "2016-06-24" @default.
- W1484358065 creator A5054319202 @default.
- W1484358065 creator A5085206568 @default.
- W1484358065 date "2010-11-12" @default.
- W1484358065 modified "2023-10-15" @default.
- W1484358065 title "Minimum hydraulic safety leads to maximum water-use efficiency in a forage grass" @default.
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- W1484358065 doi "https://doi.org/10.1111/j.1365-3040.2010.02244.x" @default.
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