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3 results for “summer dormancy”
Induction and potential role of summer dormancy to enhance persistence of perennial grasses under warmer climates
<p><span>The persistence of perennial herbaceous species is threatened by increasing aridity. However, summer dormancy is a strategy conferring superior survival to grasses adapted to hot and dry summers. The role of temperature on the induction of summer dormancy was investigated in the perennial grass<em> Dactylis glomerata</em> to analyse the potential expression of this strategy under warmer climates.</span></p> <p><span>We tested seven populations of <em>D. glomerata</em> originating from Morocco to Norway across the same latitudinal gradient in a five-site experiment. One population of the highly summer-dormant grass <em>Poa bulbosa</em> was used as a reference. Plants were grown from autumn in pots under full irrigation for one year mostly under open-air shelters. Heading date (ear emergence preceding flowering) was recorded and foliage senescence was assessed from end of spring until autumn. The maximum plant senescence under summer irrigation indicated the level of dormancy expression. Summer dormancy onset, release, expression and duration were modelled as a function of climatic variables. </span></p> <p><span>From north to south, the duration of summer dormancy of the Mediterranean populations of <em>D. glomerata</em> and <em>P. bulbosa</em> ranged from 0 to 122 days, and 79 to 200 days respectively. <em>P. bulbosa </em>was always completely dormant, while dormancy expression of <em>D. glomerata </em>was positively correlated with the sum of temperatures from winter onset (<em>R</em>²=0.57) and with the mean of minimum temperatures in summer (<em>R</em>²=0.73). D</span><span>ormancy onset, release and duration were also positively correlated with thermal time from winter onset, while the duration of summer dormancy was longer as maximum temperatures increased. </span><span>Mapping the European regions with climates allowing the expression of summer dormancy in <em>D. glomerata</em>, showed that the potentially inductive areas for this strategy may expand in parallel with increasing summer aridity under a future climate warming scenario.</span></p>
Induction and potential role of summer dormancy to enhance persistence of perennial grasses under warmer climates
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Hydrogen cyanamide breaks grapevine bud dormancy in the summer
GEO Series GSE86163. Homo sapiens; Vitis labrusca x Vitis vinifera. 9 samples. Type: Expression profiling by array.
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