论文题目: Growth, root compensation and ion distribution in Lyciumchinense under heterogeneous salinity stress

论文编号:
作者: Xiaohui Feng(封晓辉), Ping An, Kai Guo（郭凯）, Xiaoguang Li（李晓光）, Xiaojing Liu（刘小京），Xiumei Zhang（张秀梅）
刊物名称: Scientia Horticulturae
卷期页码: 226, , 24–32
发表年度: 2017
DOI: https://doi.org/10.1016/j.scienta.2017.08.011
摘要:

A split-root experiment was conducted to study the growth of the woody plantLyciumchinenseunder non-uniform salinity conditions and investigate the growth, root distribution and ion accumulation under uniform and heterogeneous NaCl stress. Four uniform salinity treatments with increasing concentrations of NaCl in the nutrient solution (0, 170, 340, and 510mM) and 6 heterogeneous salinity treatments with different concentrations of NaCl (0/170, 0/340, 0/510, 170/340, 170/510, and 340/510mM) were applied to two sides of split root pots. The results showed thatL. chinensegrowth decreased with increasing uniform salinity when the salinity was higher than 170mM. Under heterogeneous salinity stress, growth was not inhibited, except in the plants treated with 340/510mMNaCl. The leaf net photosynthesis rate and transpiration rate were close to the mean root zone salinity, and stomatal conductance was mainly influenced by higher salinity. Fine roots proliferated in the lower salinity zone, which resulted in a stable total root volume as long as the salinity of one-half of the pot was within a suitable range. The root compensation effect was stronger when the salinity difference of the root zones was larger. Under heterogeneous salinity, the leaf Na⁺and Cl^?contents were maintained at a moderate level, and the leaf soluble sugar content was also within a normal range. These results suggest that the increased fine roots in the lower salinity zone and the moderate leaf Na⁺and Cl^?contents alleviated salt stress. Thus, partial lower salinity zones can be created in heavily saline soil for the cultivation of woody plants.