烟草科技2019，Vol.52Issue(1)：1-7,7.
不同钾效率烟草品种钾素吸收特性及动力学特征分析
Potassium absorption and kinetics by different tobacco varieties at different potassium efficiency
摘要
Abstract
To explore different potassium absorption and utilization between tobacco varieties with different potassium efficiency, a sand-culture pot experiment was carried out to study the potassium nutrition characteristics from 10 tobacco varieties. The biomass, potassium content (mass fraction), potassium accumulation, root physiological indicators and potassium uptake kinetic characteristics from the 10 tobacco varieties were detected, and their potassium efficiency was evaluated and classified. The results showed that the potassium absorption efficiency of 10 tobacco varieties negatively correlated to their utilization efficiency, and the tobacco varieties could be divided into 3 types: varieties with high absorption efficiency and low utilization efficiency (Type 1), varieties with low absorption efficiency and low utilization efficiency (Type 2) and varieties with low absorption efficiency and high utilization efficiency (Type 3). Type 1 tobacco had higher potassium contents, and Type 3 tobacco was contrary. The potassium uptake kinetic parameters indicated that comparing with Type 2 and Type 3 tobaccos, the maximum uptake rate (Vmax) and comprehensive absorption capacity (α) of Type 1 tobacco increased by 90.6%, 215.6% and 36.1%, 90.6%, respectively. Comparing with Type 2 tobacco, the Vmax and α of Type 3 tobacco increased by 40.0% and 65.6%, respectively. However, the Michaelis-Menten constant (Km) of Type 3 tobacco decreased by 8.6%. Comparing with Type 1 and Type 2 tobaccos, the minimum equilibrium concentration (Cmin) and tolerance to infertility ( β) of Type 3 tobacco decreased by 15.7% , 10.2% and 15.9% , 13.1% , respectively. Root physiological indicators suggested that Type 1 tobacco had higher root vigor, soluble protein contents and K+ influxes.关键词
烟草/钾效率/钾素营养特性/吸收动力学/钾离子流速Key words
Tobacco/ Potassium efficiency/ Potassium nutrition characteristic/ Uptake kinetics/ K+ flux分类
农业科技引用本文复制引用
..不同钾效率烟草品种钾素吸收特性及动力学特征分析[J].烟草科技,2019,52(1):1-7,7.基金项目
中国烟草总公司烟草基因组计划重大专项项目"烟草基因功能元件全景图构建及关键基因挖掘与调控节点研究"[110201601033(JY-07)]. （JY-07）
