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Abiotic factors controlling germination of the multipurpose invasive Prosopis pallida: towards afforestation of salt-affected lands in the subtropical arid Arabian desert
Tropical Ecology ( IF 1.1 ) Pub Date : 2021-01-11 , DOI: 10.1007/s42965-020-00124-3
Mariam Aljasmi , Ali El-Keblawy , Kareem A. Mosa

Prosopis pallida is an exotic invasive tree recently recorded in the hot arid subtropical deserts of the UAE and has the potential for afforestation of degraded arid lands. Little information is available about the effects of abiotic stresses on the germination of this species. Here, we aimed to assess the response of drought (as simulated by polyethylene glycol, PEG) and salinity (NaCl) stresses to light and temperature of seed incubation. Seeds treated with four salinities (0–600 mM NaCl) and seven PEG (0 to – 1.8 MPa) levels were incubated at three temperatures and two light regimes. The results showed that the response of seed germination to NaCl depended on temperature, but on both light and temperatures in PEG. In both NaCl and PEG solutions, germination did not differ significantly between the three temperatures at higher osmotic potentials. Still, it was reduced significantly in the lower potentials when seeds incubated at higher temperatures. Additionally, germination in light and dark did not differ at higher osmotic potentials of PEG, but germination in the dark was significantly higher at lower osmotic potentials. A considerable proportion of seeds that failed to germinate in PEG recovered their germination when transferred to distilled water (62%), but few seeds were able to recover from NaCl (4.2%). The higher tolerance to NaCl indicates that seeds might use sodium and chloride ions as osmoregulators to alleviate the osmotic inhibitory effects. Future research should monitor seedling establishment and growth to explain plant persistence in salt-affected lands in arid environments.



中文翻译:

非生物因素控制多功能入侵拟南芥的发芽:在亚热带干旱阿拉伯沙漠中对盐碱地进行植树造林

淡水丙酸杆菌是最近在阿联酋干旱的亚热带沙漠中记录的一种外来入侵树种,具有在退化的干旱土地上造林的潜力。关于非生物胁迫对该物种发芽的影响的信息很少。在这里,我们旨在评估干旱(通过聚乙二醇,PEG模拟)和盐度(NaCl)胁迫对种子孵化的光照和温度的响应。将经过四种盐度(0–600 mM NaCl)和七种PEG(0至– 1.8 MPa)处理的种子在三种温度和两种光照条件下孵育。结果表明,种子发芽对NaCl的响应取决于温度,但取决于PEG中的光照和温度。在NaCl和PEG溶液中,三种温度下在较高的渗透势下,发芽率均没有显着差异。仍然,当种子在较高温度下孵育时,它在较低电位下显着降低。另外,在较高的PEG渗透势下,在黑暗和黑暗中的发芽没有差异,但是在较低的渗透势下,在黑暗中的发芽明显更高。大量未在PEG中发芽的种子转移到蒸馏水中后可恢复发芽(62%),但几乎没有种子能够从NaCl中恢复(4.2%)。对NaCl的较高耐受性表明,种子可能使用钠和氯离子作为渗透调节剂来减轻渗透抑制作用。未来的研究应该监测幼苗的生长和生长,以解释干旱环境中盐灾地区植物的持久性。在较高的PEG渗透势下,明和暗的发芽没有差异,但是在较低的渗透势下,黑暗中的发芽明显更高。大量未在PEG中发芽的种子在转移到蒸馏水中后可恢复发芽(62%),但几乎没有种子能够从NaCl中恢复(4.2%)。对NaCl的较高耐受性表明,种子可能使用钠和氯离子作为渗透调节剂来减轻渗透抑制作用。未来的研究应该监测幼苗的生长和生长,以解释干旱环境中盐灾地区植物的持久性。在较高的PEG渗透势下,明和暗的发芽没有差异,但是在较低的渗透势下,黑暗中的发芽明显更高。大量未在PEG中发芽的种子在转移到蒸馏水中后可恢复发芽(62%),但几乎没有种子能够从NaCl中恢复(4.2%)。对NaCl的较高耐受性表明,种子可能使用钠和氯离子作为渗透调节剂来减轻渗透抑制作用。未来的研究应该监测幼苗的生长和生长,以解释干旱环境中盐灾地区植物的持久性。大量未在PEG中发芽的种子转移到蒸馏水中后可恢复发芽(62%),但几乎没有种子能够从NaCl中恢复(4.2%)。对NaCl的较高耐受性表明,种子可能使用钠和氯离子作为渗透调节剂来减轻渗透抑制作用。未来的研究应该监测幼苗的生长和生长,以解释干旱环境中盐灾地区植物的持久性。大量未在PEG中发芽的种子转移到蒸馏水中后可恢复发芽(62%),但几乎没有种子能够从NaCl中恢复(4.2%)。对NaCl的较高耐受性表明,种子可能使用钠和氯离子作为渗透调节剂来减轻渗透抑制作用。未来的研究应该监测幼苗的生长和生长,以解释干旱环境中盐灾地区植物的持久性。

更新日期:2021-01-11
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