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采用耐低钾的玉米自交系T和一般的自交系C,以4水平钾浓度的水培方法进行对照研究.结果表明,在高钾情况下,两自交系干重几乎相同,随着钾浓度的下降,自交系T的干重明显大于自交系C;随钾浓度的下降,自交系C缺钾症状加重,而自交系T除一K处理外均无缺钾症状;缺乏钾素,自交系C的主根伸长增加及冠/根比下降程度比自交系T明显,但侧根数量较少,仅为自交系T的1/2～1/4;缺乏钾素,自交系T的植株含钾量高于自交系C,尤其根部,这种趋势更为明显;单位根重吸钾量,自交系T多于自交系C,并且随钾浓度降低,自交系T与自交系C吸钾量比值加大;根系吸K~+的同时释放H~+而引起溶液pH的下降,自交系T比自交系C明显得多.
The control experiment was conducted by using the four-level potassium concentration water-cultivation method with low-potassium-resistant maize inbred line T and general inbred line C. The results showed that the dry weight of both inbred lines was almost the same With the decrease of potassium concentration, the dry weight of T in inbred line was significantly greater than that of inbred line C. With the decrease of potassium concentration, the symptoms of C-deficient potassium in inbred line were aggravated. In the absence of potassium, the increase of root elongation and crown / root ratio in inbred line C were more obvious than inbred line T, but the number of lateral root was less, which was only 1/2 ~ 1/4 of that in inbred line T; The inbred line T had higher potassium content than the inbred line C, especially the root. This tendency was more obvious. The amount of potassium absorbed per unit root was more in the inbred line than in the inbred line C, The ratio of potassium uptake in inbred line T and inbred line C was increased. The release of H ~ + by K + in root system resulted in the decrease of pH in solution, and the inbred line T was much more than C inbred line.