干旱胁迫下不同耐旱性玉米自交系根形态特性差异

The Difference in Root Morphological Characteristics of Different Tolerance Maize Inbred Line under Drought Stress

利用课题组筛选出的典型的耐旱型玉米自交系90-21-3、8701和敏感型玉米基因型丹937、综-3,采用单株室外盆栽,从根系生长发育、根系生理特性方向进行研究。结果表明:干旱胁迫下,玉米的根系总根数、根长、根系表面积、根冠比增加,而根体积、根干重、根系吸水能力下降;耐旱型玉米基因型的植株水分利用效率上升,敏感型玉米基因型水分利用率则下降。耐旱型玉米基因型根系受干旱影响较小。

The study selected the typical droughttolerant maize genetype （90- 21- 3 and 8701） and sensitive maize gene- types （Dan937 and Zong- 3）, using outdoor potted plants as test materials, the growth, physiological characteristics and direction of root were researched. The results showed that the total root number, root length, root surface area and root- shoot ratio increased under drought stress, but the root volume, root dry weight and root uptake water capacity decreased, the water use efficiency of drought- tolerant maize genetypes increased, the sensitive maize genetypes were contrary. The root of the drought- resistant maize genetypes is affected by drought slightly.