The features of main osmolytes, silicon and their coupling effects in improving drought resistance of the typical xerophytes in the desert areas of Northwest China
文献类型： 外文期刊
作者： Kang, Jianjun 1 ; Zhao, Wenzhi 1 ; Zhou, Hong 1 ; Wang, Zhiwei 2 ;
作者机构： 1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Linze Inland River Basin Res Stn, Lanzhou 730000, Peoples R China
2.Guizhou Acad Agr Sci, Guizhou Inst Prataculture, Guiyang, Peoples R China
关键词： coupling effects; drought resistance; feature; osmolytes; succulent and less succulent xerophyte
期刊名称：LAND DEGRADATION & DEVELOPMENT （ 影响因子：4.977； 五年影响因子：5.291 ）
ISSN： 1085-3278
年卷期：
页码：
收录情况： SCI
摘要： Succulent xerophytes (SX) and less succulent xerophytes (LSX) are able to accumulate inorganic ions and synthesize organic solutes (OS) to adapt to drought stress. Silicon (Si) is one of the five beneficial elements for plants and its importance to SX has been confirmed. In the study, the features of main osmolytes and Si were studied in SX and LSX species, and the coupling effects of inorganic ions were investigated in the SX H. ammodendron and LSX C. korshinskii. Results showed that SX and LSX had the common adaptive characteristic of preferentially accumulating inorganic ions rather than OS for drought resistance, and the total amount of osmotica in SX was 2.36-times higher than that in the LSX. The greatest contribution to drought resistance was K+ (29.7%), the lowest was Na+ (2.4%) in LSX, while the greatest contribution was Na+ (41.7%), the total OS was the lowest (2.4%) in SX. The coupling effects of inorganic ions played vital important roles in drought resistance of the SX and LSX. The better coupling ratios of NaCl, NH4NO3, CaCl2, MgCl2 and Na2SiO3 in H. ammodendron were 20:5:20:40:10 and 40:10:60:10:7.5 (g kg(-1) dry soil), and the better coupling ratios of KNO3, CaCl2, MgCl2 and K2SiO3 in C. korshinskii were 20:10:20:10 and 40:20:60:5 (g kg(-1) dry soil). Findings suggested that the rational coupling of inorganic ions can be utilized as mineral compound fertilizers to restore and reconstruct degraded vegetations in semiarid areas.
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