Activation of potassium released from soil by root-secreted organic acids in different varieties of tobacco (Nicotiana tabacum)
Zhi-Xiao Yang
A B , Shi-Zhou Yu B , Ying-Chao Lin B , Wei-Jun Zhang C , Yi Wang B , Ren-Gang Wang B , Shi-Xiao Xu A , Tie-Zhao Yang A and Gang Xue A D
+ Author Affiliations
- Author Affiliations
A College of Tobacco Science, Henan Agricultural University, Zhengzhou, 45002, PR China.
B Guizhou Academy of Tobacco Science, Guiyang, 550081, PR China.
C Fenggang Tobacco Filiale of Guizhou Province Tobacco Company, Fenggang 564200, China.
D Corresponding author. Email: linyingxian2006@163.com
Functional Plant Biology 47(4) 318-326 https://doi.org/10.1071/FP19137
Submitted: 21 May 2019 Accepted: 19 November 2019 Published: 14 February 2020
Abstract
Organic acids secreted from the roots of plants play important roles in nutrient acquisition and metal detoxification; however, the precise underlying mechanisms of these processes remain poorly understood. In the present study we examined the content of organic acids exuded from roots and the effects of these organic acids on the activation of slowly available potassium (K) at different K levels, including normal K supply and K-deficient conditions. In addition, the study system also comprised a high-K tobacco variety (ND202) and two common ones (K326 and NC89). Our results showed that high-K varieties exhibited significantly higher contents of organic acids in its root exudates and available K in both rhizosphere and non-rhizosphere soils than the other varieties. This research also suggested that a cyclic process in which soil was acidified after being complexed by organic acids was involved in the release of slowly available K, and that this process primarily depended on the soil pH at high organic acids concentrations, but the complexation of organic ligands became dominant at low concentrations. In conclusion, tobacco roots secrete organic acids to increase available K content and improve the utilisation rate of soil K. High-K varieties probably enhance slowly available K activation by secreting relatively high amounts of organic acids, thus leading to more available K in soil for absorption by plants.
Additional keywords: acidification, available K, complexation, rhizosphere, utilization.
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