不同耐性玉米自交系苗期根系对低钾胁迫的生物学响应

通过水培试验,以典型耐低钾玉米自交系90-21-3和低钾敏感玉米自交系835为试材,分别于4、6、7、9和10叶期测定玉米根形态、根系还原力、伤流量和干物质积累量,研究不同耐性玉米自交系苗期根系对低钾胁迫的生物学响应。结果表明,低钾胁迫下,耐低钾玉米自交系90-21-3表现为根长增幅大,根表面积、根体积降幅小,根平均直径降幅大。与低钾敏感玉米自交系835相比,低钾胁迫下耐低钾玉米自交系90-21-3的根系相对发达、根系活力强、伤流量大及干物质积累量较大。

Biological Response to Potassium Deficiency on Root of Different Tolerance Maize Inbred Lines at Seedling Stage

Two contrasting maize inbred lines(tolerant to K⁺ deficiency 90-21-3 vs. sensitive to K⁺ deficiency 835) were hydroponically grown in 1/2 Hoagland solution and subjected to potassium(K⁺) deficiency. The biological responses of potassium deficiency on the root of different tolerance maize inbred lines at seedling stage were determined in terms of root morphological indexes, root reduction capacity, root bleeding sap volume and dry matter accumulation as well as possible factors governing from 4 leaves stage to 10 leaves stage. The results indicated that the root length, root surface area and root volume of 90-21-3 increased greatly, while the root average diameter decreased to a small extent. The root vigor and root bleeding sap volume of 90-21-3 were bigger than that of 835. Compared with the maize inbred line sensitive to K⁺ deficiency, the maize inbred line tolerant to K⁺ deficiency have more advantages in terms of root development,root reduction capacity and dry matter accumulation under potassium deficiency.