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A genetic view on the role of prolonged drought stress and mating systems on post-drought recovery, persistence and drought memory of orchardgrass (Dactylis glomerata L.)
Euphytica ( IF 1.9 ) Pub Date : 2020-05-23 , DOI: 10.1007/s10681-020-02624-8
Fatemeh Saeidnia , Mohammad Mahdi Majidi , Aghafakhr Mirlohi , Soheila Spanani , Zohreh Karami , Mostafa Abdollahi Bakhtiari

The consequences of recurrent drought events compared with a single drought and its interaction with deliberate selfing, compared with open-pollination on post-stress recovery, persistence, and drought memory, are not understood in orchardgrass (Dactylis glomerata L.). A long term study was started by creating 25 selfed (S1) and 25 open-pollinated progeny of orchardgrass in 2012. Populations were studied in the field, applying a normal and a recurrent drought stress environment for 4 years (2013–2016). In 2016, after the first harvest (June), watering was withheld in both moisture environments for 2 months and then plants were re-watered and evaluated for post-drought recovery and drought memory. On average, open pollination caused higher forage yield in the second and third years; while, in the first and fourth years, there was no significant difference. Obligate selfing reduced persistence of genotypes but did not affect recovery after prolonged drought. The early flowering genotypes had more plant productivity, yield stability, persistence, and drought tolerance, and were also capable of more regrowth and recovery. The results showed that genotypes of orchardgrass constantly performed differently under periodic drought as compared to prolonged drought stress. Moreover, there were significant genetic variations between genotypes in terms of stress memory.

中文翻译:

关于长期干旱胁迫和交配系统对果园草(Dactylis glomerata L.)干旱后恢复、持久性和干旱记忆作用的遗传观点

在果园草(Dactylis glomerata L.)中,与单次干旱相比,反复干旱事件的后果及其与故意自交的相互作用,与开放授粉相比,对应激后恢复、持久性和干旱记忆的影响尚不清楚。通过在 2012 年培育 25 个自交 (S1) 和 25 个开放授粉的果园草后代,开始了一项长期研究。在田间研究种群,应用正常和反复干旱胁迫环境 4 年(2013-2016 年)。2016 年,在第一次收获(6 月)后,在两种潮湿环境中都停止浇水 2 个月,然后重新浇灌植物并评估干旱后恢复和干旱记忆。平均而言,露天授粉在第二年和第三年导致更高的草料产量;而在第一年和第四年,没有显着差异。专性自交降低了基因型的持久性,但不影响长期干旱后的恢复。早花基因型具有更高的植物生产力、产量稳定性、持久性和耐旱性,并且能够更多地再生长和恢复。结果表明,与长期干旱胁迫相比,在周期性干旱条件下,果园草的基因型持续表现不同。此外,在压力记忆方面,基因型之间存在显着的遗传变异。结果表明,与长期干旱胁迫相比,在周期性干旱条件下,果园草的基因型持续表现不同。此外,在压力记忆方面,基因型之间存在显着的遗传变异。结果表明,与长期干旱胁迫相比,在周期性干旱条件下,果园草的基因型持续表现不同。此外,在压力记忆方面,基因型之间存在显着的遗传变异。
更新日期:2020-05-23
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