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Ecological role of bracteoles in seed dispersal and germination of the North African halophyte Atriplex mollis under contrasting environments
Botany Letters ( IF 1.5 ) Pub Date : 2019-09-16 , DOI: 10.1080/23818107.2019.1652850
Abderrazak Tlili 1 , Jamila Zammouri 1 , Mustapha Gorai 2 , Mohamed Neffati 1
Affiliation  

The patterns of germination responses of Atriplex mollis seeds reveal species-specific tolerances and represents the adaptive strategies of species to stressful environments. To the best of our knowledge, this is the first report about germination patterns of A. mollis providing basic information for its conservation and reintroduction into degraded lands. Herein, two seed lots, with and without bracteoles, were tested for germination (i.e. salinity and drought). The highest germination percentage was under non-saline conditions, and with increasing NaCl-salinity, seed germination is inhibited. Bracteoles did not affect germination at low salinity levels, but significant inhibition becomes evident at −0.75 MPa. Moreover, PEG-induced osmotic stress had an adverse effect on germination of seeds with or without bracteoles at −0.75 MPa (ca. 20% and 10%, respectively). Bracteoles have a significant decreased effect on germination during recovery; they showed more detrimental effects following NaCl than PEG incubation. Importantly, the flotation of dispersal units with bracteoles was less than 60% under in freshwater and reached 100% at 27 g NaCl L−1. It is concluded that bracteoles play a dual role by inhibiting germination under high salinity levels and enhancing it under less negative osmotic potential.



中文翻译:

在不同环境下小虫在北非盐生植物滨藜的种子传播和发芽中的生态作用

毛滨藜种子的萌发响应模式揭示了特定物种的耐受性,并代表了物种对胁迫环境的适应策略。据我们所知,这是关于A. mollis发芽模式的第一份报告提供保护和重新引入退化土地的基本信息。在此,测试了具有和不具有小act片的两个种子批次的发芽(即盐度和干旱)。最高发芽率是在非盐碱条件下,并且随着NaCl盐度的增加,种子发芽受到抑制。小盐泡在低盐度下不影响发芽,但在-0.75 MPa时明显抑制。此外,PEG诱导的渗透胁迫对在-0.75 MPa时有或没有小act片的种子的发芽有不利影响(分别约为20%和10%)。小ract在恢复过程中对发芽的影响明显降低;与PEG孵育相比,它们在NaCl后显示出更大的有害作用。重要的,-1。结论是,小act子在高盐度水平下抑制发芽并在负渗透压较小的情况下增强发芽,从而起到双重作用。

更新日期:2019-09-16
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