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在水培条件下研究了转基因抗虫棉中棉所41和常规棉中棉所36、中棉所35三个品种苗期钾吸收效率的差异及其机制。结果表明,在营养液中钾浓度为0.5 mmol.L-1,可使棉花幼苗生长速率达到最高生长速率80%左右的条件下,中棉所35和中棉所41在6~7叶期的生物量和体内钾吸收量显著高于中棉所36。中棉所35的吸钾量多主要与其根系活跃吸收表面积大有关;中棉所41的吸钾量多可能是相对较大的根系活跃吸收表面积和相对较高的Imax综合作用的结果。中棉所36的Imax虽然显著高于其它两个品种,但体内钾累积量却比较低,这与其较小的根系活跃吸收表面积有关,该品种体内较高的钾浓度也可能对吸收产生反馈抑制作用。在本试验条件下,转基因抗虫棉中棉所41的苗期钾吸收能力与常规棉相比并不低。
Under hydroponic conditions, the differences in potassium absorption efficiency of transgenic Bt cotton Zhongmiansuo 41 and conventional cotton Zhongmiansuo 36 and Zhongmiansu 35 were investigated. The results showed that when the potassium concentration in the nutrient solution was 0.5 mmol·L-1, the maximum growth rate of cotton seedlings could reach about 80% The biomass and in vivo potassium uptake were significantly higher than those from CIMB. The most potassium uptake by CIMC 35 was mainly related to the active absorption surface area of its root system. The more potassium absorption capacity of CIMC 41 was probably the result of the relatively large root active absorption surface area and the relatively high Imax combined effect. Although the Imax of CIMC 36 was significantly higher than that of the other two cultivars, the accumulation of potassium in the body was relatively low, which was related to its smaller active surface area for root absorption. The higher potassium concentration in CIMC 36 also might have feedback inhibition on absorption effect. Under the conditions of this experiment, the transgenic rice plants had the highest potassium absorption capacity at seedling stage compared with that of conventional cotton.