The low Potassium (K) content in flue-cured tobacco leaves severely restricts the development of China's high-quality cigarette industry. To determine whether the quality of flue-cured tobacco leaves can be improved by grafting, a cross-grafting experiment of two different K-efficiency tobacco strain (Yunyan 87, main cultivar. WuFeng No.2, K-efficient genotype) was carried out. Measurement data from a field experiment with three K supply levels (0,135 and 270 kg K₂O ha⁻¹) and four grafting combinations [‘Wufeng No. 2’(W), ‘Yunyan 87’(Y), Y/W (Y grafted onto W) and W/Y (W grafted onto Y)] from 2018 to 2019 were used to evaluate the effect of grafting on flue-cured tobacco quality. The results demonstrated that the average leaf maturity in the grafted tobacco ‘Yunyan 87’ increased by 7.69 %. Meanwhile, maximum accumulation, rapid accumulation duration, and maximum relative accumulation rates of K and biomass in the grafting treatments were all improved over the growth period, and the K levels in the grafted tobacco leaves increased by 95.4 % on average. In addition, when potassium supply level was insufficient, the proportion of K⁺ in grafted tobacco leaves was higher than that in other treatments. In terms of commercial quality, the chemical and smoking quality of grafted tobacco leaves were 32.2 % and 7.1 % higher than those of ungrafted tobacco leaves. The grafted ‘Yunyan 87’ inherited the advantages of the scion in terms of flavor. At the same time, the combustibility of Y/W was improved by the characteristics of the rootstock, and its total score of quality was highest. The correlation analysis revealed that K accumulation was significantly related to the improvement of tobacco leaf quality. Therefore, increasing the K content and improving the quality of tobacco leaves through grafting is a feasible approach for the production of high quality flue-cured tobacco.

烤烟叶中钾（K）含量偏低，严重制约了我国优质卷烟产业的发展。为确定嫁接能否提高烤烟烟叶品质，对两种不同钾效烟草菌株（云烟87，主要栽培品种五风2号，钾效基因型）进行了交叉嫁接试验。 . 来自三个钾供应水平（0,135 和 270 kg K ₂ O ha ^-1)和2018-2019年四种接枝组合['五峰2号'(W)、'云岩87'(Y)、Y/W(Y接W)和W/Y(W接Y)]评价嫁接对烤烟品质的影响。结果表明，嫁接烟草'云烟87'的平均叶片成熟度提高了7.69%。同时，嫁接处理中钾和生物量的最大积累、快速积累持续时间和最大相对积累率均在生育期内得到提高，嫁接烟叶中钾含量平均提高了95.4%。此外，当钾供应水平不足时，K ⁺的比例嫁接烟叶的含量高于其他处理。在商品品质方面，嫁接烟叶的化学品质和烟熏品质比未嫁接的烟叶高32.2%和7.1%。嫁接的'云烟87'在风味上继承了接穗的优点。同时，砧木的特性提高了Y/W的可燃性，其质量总分最高。相关分析表明，钾素积累与烟叶品质改善显着相关。因此，通过嫁接提高烟叶含钾量，提高烟叶品质是生产优质烤烟的可行途径。