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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、7g·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5g·kg-1,较普通白蜡高1g·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1~3g·kg-1处理中为根>茎>叶,4g·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。
The new strain of salt-resistant superior white velvet (Fraxinus velutina) and common villi as test material, under the condition of pot with the mass concentration of 0,1,2,3,4,5,6,7 g · kg-1 of NaCl The physiological and biochemical indexes such as Na +, K +, biomass, photosynthetic index and soluble sugar in roots, stems and leaves were measured after stress. The physiological responses of the wax to NaCl stress were also investigated. The results showed that the waxes of the selected new strains were more resistant to salt stress than common villus wax; the mechanism of salt tolerance was mainly salt and the content of soluble sugar in the plants. Salt tolerant superior white wax salt tolerance threshold of 5g · kg-1, 1g · kg-1 higher than normal wax, with further breeding, villi white wax can be used as a good tree species around the Bohai Sea Saline-alkali landscaping. Na + uptake increased with the increase of NaCl concentration in NaCl-tolerant white ash, but increased with the increase of NaCl concentration. The root> stem> leaf, 4g · kg-1 and 1g · kg- The above treatment leaf> stem> root. The total accumulation of Na + in salt-tolerant elite strain was higher than that of common wax, the concentration of low salt concentration in roots, the concentration of high salt concentration in leaves, and the effect of poly-salt significantly. Under the salt stress, the content of soluble sugar in plant was significantly higher than that in common wax, and was significantly increased with the increase of NaCl concentration.