Journal of Integrative Agriculture ›› 2018, Vol. 17 ›› Issue (12): 2813-2821.DOI: 10.1016/S2095-3119(18)61949-5

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  • 收稿日期:2017-12-12 出版日期:2018-12-01 发布日期:2018-12-03

High potassium to magnesium ratio affected the growth and magnesium uptake of three tomato (Solanum lycopersicum L.) cultivars

LI Hui-xia1, 2, 3, CHEN Zhu-jun1, 2, ZHOU Ting1, 2, LIU Yan1, 2, ZHOU Jian-bin1, 2   

  1. 1 College of Natural Resource and Environment, Northwest A&F University, Yangling 712100, P.R.China
    2 Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, P.R.China
    3 Department of Bioengineering, Yinchuan Institute of Energy, Yinchuan 750105, P.R.China
  • Received:2017-12-12 Online:2018-12-01 Published:2018-12-03
  • Contact: Correspondence CHEN Zhu-jun, E-mail: zjchen@nwsuaf.edu.cn; ZHOU Jian-bin, E-mail:jbzhou@nwsuaf.edu.cn
  • About author:LI Hui-xia, E-mail: lihuixia_76@163.com;
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41671295) and the Agricultural Scientific and Technological Project in Shaanxi Province, China (2014K01-14-03).

Abstract:

Potassium (K) and magnesium (Mg) levels and their balances are two factors affecting the growth of plant.  However, the responses of different crop cultivars to K/Mg ratios are less clear.  This study was aimed at assessing the different responses of tomato (Solanum Lycopersicum L.) cultivars to the different K/Mg supply ratios.  Three tomato cultivars (Zhongza 9 (ZZ), Gailiangmaofen (MF), and Jinpengchaoguan (JP)) were grown in pots with three different K+/Mg2+ ratios (4:0, 4:1 and 8:1, represented by K/Mg4:0, K/Mg4:1, and K/Mg8:1, respectively).  Compared with K/Mg4:1 treatment, the leaf chlorophyll content, net photosynthetic rate, and total biomass of tomato seedlings under K/Mg4:0 treatments were decreased by 69.7, 89.1, and 53.1%, respectively.  The Mg deficiency symptoms were observed when the Mg content in shoot became lower than 4 mg g–1 DW.  Compared with K/Mg4:1 treatment, total biomass of tomato seedlings of K/Mg8:1 treatment was decreased by 21.6%; the shoot and root Mg contents were decreased by 10.4 and 21.8%, respectively; and Mg uptake of tomato was reduced by 34.1%.  There were significant differences in biomass and Mg uptake for the three cultivars between the different K+/Mg2+ treatments.  The Mg uptake of the three different cultivars ranked as ZZ>JP>MF under Mg deficiency and high K condition.  In conclusion, the growth and Mg uptake and allocation of tomato were influenced significantly by imbalance K and Mg supply. JP and ZZ were the cultivars with the highest efficiency in Mg uptake. 

Key words:  tomato cultivars ,  potassium-magnesium ,  ionic interaction ,  magnesium uptake