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- Title
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.
- Authors
Kang, Jianjun; Zhao, Wenzhi; Zhou, Hong; Wang, Zhiwei
- Abstract
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.
- Subjects
DROUGHTS; DESERTS; SILICON; SOIL drying
- Publication
Land Degradation & Development, 2020, Vol 31, Issue 17, p2720
- ISSN
1085-3278
- Publication type
Article
- DOI
10.1002/ldr.3631