Frequency and intensity of floods and the extent of salt-affected lands are expected to increase in pastures and grassland ecosystems as a result of global climate change. This study evaluated the effects of waterlogging, salinity (150 mm NaCl, ~15 dS m^–1) and their combination over 14 days of treatment on morphological and growth traits of seven cultivars of Festuca arundinacea (tall fescue). Recovery was also assessed after a 14-day growth period under aerated, non-saline conditions (recovery phase). All cultivars survived the imposed stresses, showing greater tolerance to waterlogging than to salinity or the combined stress, evaluated as a response ratio of total dry mass relative to the control. The combined stress provoked growth lower than predicted by a multiplicative model in one cultivar, growth equal to the model in three cultivars and growth higher than the model in three cultivars. High variability among cultivars in response to each stress and phase was observed; this was more evident for relative growth rate of roots than of shoots. Plant morphological traits were affected by treatments in different ways; mature tiller weight was maintained, and tiller number decreased by 79–71% under waterlogging and combined stresses, whereas the opposite responses occurred under salinity. During the recovery phase, plants in all stress treatments had lower tiller numbers than controls and prioritised the growth of pre-existing tillers, which were heavier. Number of dead leaves per plant increased in saline and combined treatments. In general, F. arundinacea proved more tolerant to waterlogging than to salinity or combined treatments, and showed promising variability among cultivars with respect to root relative growth rate under the evaluated stresses, which can be used in future breeding programs. The findings also provide a basis for further research into the tolerance mechanisms involved.

由于全球气候变化，牧场和草地生态系统中洪水的频率和强度以及受盐碱地影响的范围预计会增加。这项研究评估了淹水，盐分（150 m m NaCl，〜15 dS m ^–1）及其组合在14天的处理过程中对7种金合子的形态和生长特性的影响。（高羊茅）。在充气，非盐条件下（恢复期），经过14天的生长期后，还评估了恢复情况。所有品种在胁迫下均能生存，表现出对涝渍的耐受性大于对盐渍或组合胁迫的耐受性，以总干物质相对于对照的响应比进行评估。组合胁迫引起的生长低于一个品种的乘法模型的预测，三个品种的生长等于模型，三个品种的生长高于模型。观察到品种对每个胁迫和阶段的响应均存在高度变异性。这对于根的相对生长速率比对芽的生长速率更为明显。处理对植物形态特征的影响不同。维持了成熟的分till体重，在淹水和综合胁迫下，分till数减少了79-71％，而在盐度下则发生了相反的反应。在恢复阶段，在所有胁迫处理下的植物分numbers数量均低于对照，并且优先考虑已存在的分ers较重的生长。在盐水和联合处理下，每株植物的死叶数量增加。一般来说，F. arundinacea被证明比盐渍或联合处理更耐涝，并且在评估的胁迫下，根系相对生长率表现出可观的变异性，可用于将来的育种计划。这些发现也为进一步研究所涉及的耐受机制提供了基础。