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| A Sodium Compound Fertilizer Promotes Root Growth in Zygophyllum xanthoxylum under Drought Stress |
| Wang Chunmei1,2, Xia Zengrun1, Zhang Jinlin1, Bao Aike1, Zhou Xiangrui1, Yue Lijun1, Wang Suomin1 |
1. State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China;
2. Lanzhou Institute of Husbandry and Pharmaceutical, Chinese Academy of Agriculture Sciences, Lanzhou 730050, China |
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Abstract Zygophyllum xanthoxylum is a succulent xerophyte that widely lives in desert area. The effects of a newly invented sodium compound fertilizer on both morphological and physiological indices relevant to root growth were investigated in pots experiments in order to evaluate the contribution of Na+ to root growth of Z. xanthoxylum under drought stress. The results indicated that the sodium compound fertilizer significantly enhanced root growth as well as drought resistance of Z. xanthoxylum: (1) The sodium compound fertilizer mainly improved plant height, promoted the growth of lateral roots and enhanced root activity significantly under well irrigated condition; (2) The sodium compound fertilizer significantly improved root active absorbent area by 24% and increased taproot diameter and elongation to uptake sufficient water and mineral nutrition after 15 days' drought treatment; (3) Ion analysis showed that Na+ concentration in roots of Z. xanthoxylum under drought stress was maintained at a high level, however, K+ concentration decreased by 42% by the sodium compound fertilizer. Therefore, it is proposed that Na+ could significantly improve lateral root growth and root activity under well irrigated condition, whereas, enhance root active absorbent area and taproot growth to improve the drought tolerance of Z. xanthoxylum under water stress, which was mainly caused by the higher accumulation of Na+, not K+, in roots and leaves of Z. xanthoxylum.
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Received: 01 January 2013
Published: 20 March 2014
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Corresponding Authors:
王锁民（Email：smwang@lzu.edu.cn）
E-mail: smwang@lzu.edu.cn
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2014, Vol. 34 
