Jiang Li, Wang Lei, Zhang Lei, Tian Changyan
Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang, China.
Turpan Eremophytes Botanical Garden, Chinese Academy of Sciences, Urumqi, Xinjiang, China.
PeerJ. 2018 Aug 29;6:e5559. doi: 10.7717/peerj.5559. eCollection 2018.
Primarily, lithium (Li) resource development and wider application of Li-ion batteries result in Li pollution and concomitantly poses increasing and inevitable problems to environmental health and safety. However, information is rare about the scope of the remediation of Li contaminated soil. is already proved to be a Li-accumulator with high Li tolerance and accumulation (Jiang et al., 2014). However, it is not clear whether , another species of the same genus with the same uses as , is also a Li-accumulator. We investigated germination, growth and physiological responses of to different levels of LiCl. Germination was not significantly affected by low Li concentration (0-100 mmol L). As LiCl increased from 100 to 400 mmol L, both germination percentage and index decreased gradually. For germination of seeds, the critical value (when germination percentage is 50%) in LiCl solution was 235 mmol L, and the limit value (when germination percentage is 0%) was 406 mmol L. could accumulate >1,800 mg kg Li in leaves, and still survived under 400 mg kg Li supply. The high Li tolerance of during germination and growth stage was also reflected by activity of α-amylase and contents of soluble sugar, proline and photosynthetic pigments under different Li treatments. The bioconcentration factors (BCF) (except control) and translocation factors (TF) were higher than 1.0. High tolerance and accumulation of Li indicated that is Li-accumulator. Therefore, this species could be useful for revegetation and phytoremediation of Li contaminated soil.
首先，锂（Li）资源的开发以及锂离子电池的广泛应用导致了锂污染，随之给环境健康与安全带来了日益增多且不可避免的问题。然而，关于锂污染土壤修复范围的信息却很少。已被证明是一种对锂具有高耐受性和积累能力的锂积累植物（Jiang等人，2014年）。然而，尚不清楚与用途相同的同属另一物种是否也是锂积累植物。我们研究了该物种对不同浓度LiCl的萌发、生长和生理反应。低锂浓度（0 - 100 mmol/L）对萌发没有显著影响。随着LiCl浓度从100 mmol/L增加到400 mmol/L，发芽率和发芽指数逐渐下降。对于该物种种子的萌发，LiCl溶液中的临界值（发芽率为50%时）为235 mmol/L，极限值（发芽率为0%时）为406 mmol/L。该物种叶片中锂的积累量可超过1800 mg/kg，在供应400 mg/kg锂的情况下仍能存活。不同锂处理下α -淀粉酶活性、可溶性糖、脯氨酸和光合色素含量也反映了该物种在萌发和生长阶段对高锂的耐受性。生物富集系数（BCF）（对照除外）和转运系数（TF）均高于1.0。对锂的高耐受性和积累表明该物种是锂积累植物。因此，该物种可用于锂污染土壤的植被恢复和植物修复。
