4.6 Article

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

期刊

JOURNAL OF INTEGRATIVE AGRICULTURE
卷 17, 期 12, 页码 2813-2821

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ELSEVIER SCI LTD
DOI: 10.1016/S2095-3119(18)61949-5

关键词

tomato cultivars; potassium-magnesium; ionic interaction; magnesium uptake

资金

  1. National Natural Science Foundation of China [41671295]
  2. Agricultural Scientific and Technological Project in Shaanxi Province, China [2014K01-14-03]

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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/Mg 4: 0, K/Mg 4: 1, and K/Mg 8: 1, respectively). Compared with K/Mg 4: 1 treatment, the leaf chlorophyll content, net photosynthetic rate, and total biomass of tomato seedlings under K/Mg 4: 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/Mg 4:1 treatment, total biomass of tomato seedlings of K/Mg 8:1 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.

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