LIU Haiman,FENG Xiaohui,LIU Yi,et al.Physiological Response of Fraxinus velutina to NaCl Stress[J].Northern Horticulture,2016,40(10):70-75.[doi:10.11937/bfyy.201610018]
绒毛白蜡对NaCl胁迫的生理响应
- Title:
- Physiological Response of Fraxinus velutina to NaCl Stress
- Keywords:
- salinization; Fraxinus velutina; NaCl stress
- 文献标志码:
- A
- 摘要:
- 以新品系耐盐优株绒毛白蜡（Fraxinus velutina）和普通绒毛白蜡为试材，在盆栽条件下用质量浓度为0、1、2、3、4、5、6、7 g?kg-1的NaCl溶液进行胁迫处理，测定了胁迫后根、茎、叶中Na+、K+含量以及生物量、光合指标、可溶性糖等生理指标，探讨白蜡在NaCl胁迫下的生理响应。结果表明：所选育的新品系白蜡比普通绒毛白蜡耐盐性更强；耐盐机制以聚盐和增加植株内可溶性糖含量为主。耐盐优株白蜡耐盐阈值为5 g?kg-1，较普通白蜡高1 g?kg-1，随着进一步的选育，绒毛白蜡可作为环渤海盐碱地区绿化的优良树种。耐盐优株白蜡对Na+吸收随NaCl浓度增加而增加，在各器官积累量随浓度增加有相应变化，在1~3 g?kg-1处理中为根＞茎＞叶，4 g?kg-1及以上处理中为叶＞茎＞根。Na+在耐盐优株白蜡体内总积累量高于普通白蜡，低盐浓度在根部聚集，高盐浓度在叶中聚集，聚盐作用显著。耐盐优株白蜡在盐胁迫条件下，植株内可溶性糖含量显著高于普通白蜡，并随NaCl浓度升高显著增加。
- Abstract:
- aking new strain salt tolerance Fraxinus velutina and normal F.velutina as experimental materials, pot culture were conducted to investigate the Na+,K+,biomass and water content changes of F.velutina，which were irrigated with NaCl stress concentration of 0 g?kg-1，1 g?kg-1，2 g?kg-1，3 g?kg-1，4 g?kg-1，5 g?kg-1，6 g?kg-1，7 g?kg-1 mass concentration.The results showed that the selected new strain F.velutina’s salt-tolerance ability was better than the normal F.velutina；the main mechanism of salt tolerance was polysalt and increasing soluble sugar content.The salt tolerance F.velutina threshold was 5 g?kg-1，1 g?kg-1 higher than ordinary F.velutina.Along with further breeding, F.velutina could be used as a good greening tree species of the Bohai Sea salt-affected area.With salt stress concentration increased，Na+absorption of salt tolerance F.velutina increased,the fundamental order of accumulation in various organs changed with the salt stress concentration.In 1-3 g?kg-1,the order was root>stem>leaf;above 4 g?kg-1,the order was leaf>stem>root.The total accumulation of Na+ in salt tolerance F.velutina was higher than normal F.velutina,when in low salt stress situation，Na+ accumulate in root，accumulate in leaves in high salt stress situation,polysalt significantly.Under high-salt circumstance，the content of soluble sugar in salt tolerance F.velutina higher than the normal F.velutina，and increased with the increase of salt stress.
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备注/Memo
第一作者简介：刘海曼（1991-），女，河北石家庄人，硕士研究生，研究方向为盐渍区水土资源高效利用。E-mail：809529815@qq.com. 责任作者：刘小京（1966-），男，河北宁晋人，研究员，现主要从事缺水盐渍区水土资源高效利用等研究工作。E-mail：xjliu@sjziam.ac.cn. 基金项目：国家科技支撑计划资助项目（2013BAC02B01）。