Drought stress responses of seedlings of two oak species (<i>Quercus cerris</i> and <i>Quercus robur</i>)
Effects of drought stress on growth, predawn xylem water potential (ψpd), osmotic solutes (soluble sugar and proline), and
stomatal conductance were assessed in two oak (Quercus cerris L. and Quercus robur L.) seedlings. Seedlings of both species were
subjected to three drought treatments with the following irrigation intervals: well-watered (control: irrigation every 2-3 days), moderate
drought stress (irrigation every 15 days), and severe drought stress (irrigation every 30 days). Drought-stressed seedlings of Q. cerris and
Q. robur had more negative predawn xylem water potential than their well-watered seedlings. In Q. cerris, root collar diameter and root
dry weights were negatively influenced by drought, while height, shoot dry weight, and root:shoot ratios were unaffected. Height and
shoot dry weight of drought-stressed Q. robur were decreased, while root:shoot ratio increased. Drought caused significant decreases
in stomatal conductance of both species. Q. cerris seedlings sustained higher stomatal conductance compared with Q. robur. Proline
and soluble sugar increased in response to drought stress. Q. robur had a higher proline accumulation than Q. cerris. These findings
suggested that the Q. cerris and Q. robur seedlings showed a drought stress adaptive mechanism either by restricting their growth or
increasing root:shoot ratio or by decreasing water loss (reduced stomatal conductance) and accumulating of osmotic solutes.
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