The consequences of recurrent drought events compared with a single drought, and drought's interaction with deliberate selfing compared with open‐pollination on postdrought recovery and persistence of smooth bromegrass, are not clear. This research was conducted to investigate the effects of recurrent drought stresses compared with a single drought on stress response, poststress recovery and persistence of full‐sib and half‐sib progenies of smooth bromegrass. During this study, 25 selfed (S1) and 25 open‐pollinated (OP) progenies of smooth bromegrass created in 2012 were evaluated in the field under normal and recurrent drought stress during 2013–2016. After the first harvest of above‐ground biomass in 2016, irrigation was withheld in both environments for 2 months; plants were subsequently re‐watered and evaluated. Recurrent drought stress changed the relationships between different traits. Moreover, prolonged drought stress resulted in increased plant productivity (recovery aerial biomass; RABI) of S1 and OP populations in recurrent drought stress compared with normal environment. Mandatory selfing increased persistence of smooth bromegrass genotypes but did not affect recovery after prolonged drought stress. Results revealed that, selecting among S1 families would be more effective than OP ones.

中文翻译：

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光滑的无芒雀麦（干旱无花果）中长期干旱引起的基因型特异性反应：与交配系统的相互作用

与单一干旱相比，反复干旱事件的后果，以及干旱与故意自交的相互作用与裸露授粉的关系，对干旱后恢复和持久的无芒草的持久性尚不清楚。这项研究的目的是研究与单次干旱相比，反复干旱胁迫对光滑无芒草的全同胞和半同胞子代的胁迫响应，后应激恢复和持久性的影响。在这项研究中，在2013-2016年间，在正常和反复干旱胁迫下，对田间在2012年创建的25个自交（S1）和25个开放授粉（OP）后代进行了评估。在2016年首次收获地上生物量之后，两种环境均停止灌溉2个月；随后将植物浇水并进行评估。反复干旱胁迫改变了不同性状之间的关系。此外，与正常环境相比，长期干旱胁迫导致反复干旱胁迫下S1和OP种群的植物生产力（恢复的空中生物量； RABI）增加。强制性自交增加了光滑苔藓基因型的持久性，但在长期干旱胁迫后不影响恢复。结果显示，在S1家庭中进行选择比在OP家庭中更有效。强制性自交增加了光滑苔藓基因型的持久性，但在长期干旱胁迫后不影响恢复。结果显示，在S1家庭中进行选择比在OP家庭中更有效。强制性自交增加了光滑苔藓基因型的持久性，但在长期干旱胁迫后不影响恢复。结果显示，在S1家庭中进行选择比在OP家庭中更有效。