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Publication Type J
Authors Feng, X. H., P. An, K. Guo, X. G. Li, X. J. Liu and X. M. Zhang
Title Growth, root compensation and ion distribution in Lycium chinense under heterogeneous salinity stress
Source Scientia Horticulturae
Author Keywords Heterogeneous salinity Split root Halophytes Lycium chinense Ions accumulation Root compensation halophyte atriplex-nummularia water-uptake zone salinity seedlings responses system salt soil na+ photosynthesis
Abstract A split-root experiment was conducted to study the growth of the woody plant Lycium chinense under 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 510 mM) and 6 heterogeneous salinity treatments with different concentrations of NaCl (0/170, 0/340, 0/510, 170/340, 170/510, and 340/510 mM) were applied to two sides of split root pots. The results showed that L. chinense growth decreased with increasing uniform salinity when the salinity was higher than 170 mM. Under heterogeneous salinity stress, growth was not inhibited, except in the plants treated with 340/510 mM NaCl. 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.
Author Address [Feng, Xiaohui; Guo, Kai; Li, Xiaoguang; Liu, Xiaojing; Zhang, Xiumei] Chinese Acad Sci, Inst Genet & Dev Biol, Ctr Agr Resources Res, Key Lab Agr Water Resources, 286 Huaizhong Rd, Shijiazhuang 050023, Hebei, Peoples R China. [Feng, Xiaohui; Li, Xiaoguang] Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China. [An, Ping] Tottori Univ, Arid Land Res Ctr, 1390 Hamasaka, Tottori 6800001, Japan. Liu, XJ (reprint author), Chinese Acad Sci, Inst Genet & Dev Biol, Ctr Agr Resources Res, Key Lab Agr Water Resources, 286 Huaizhong Rd, Shijiazhuang 050023, Hebei, Peoples R China. xjliu@sjziam.ac.cn
ISSN 0304-4238
ISBN 0304-4238
29-Character Source Abbreviation Sci. Hortic.
Publication Date Dec
Year Published 2017
Volume 226
Beginning Page 24-32
Digital Object Identifier (DOI) 10.1016/j.scienta.2017.08.011
Unique Article Identifier WOS:000412959100004

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