不同温度水杨酸引发对干旱胁迫下玉米种子发芽及幼苗生理特性的影响

为探究不同温度水杨酸(SA)引发对水分胁迫下玉米种子发芽和幼苗生长、生理特性的影响,以‘郑单958’、‘金甜808’和‘京科糯2000’为试验材料,设置5组处理(CK、5、10、15、20℃)研究干旱胁迫下幼苗生长表现。结果表明,水杨酸引发显著提高了玉米幼苗抗氧化酶活性,增加了渗透调节物质含量,降低了丙二醛(MDA)含量,缓解了水分胁迫对玉米生长的影响。其中,玉米发芽参数（发芽率、发芽势、发芽指数和活力指数）,‘郑单958’和‘金甜808’以15℃引发处理最高,较对照分别提高了16.67%、21.26%、17.69%、25.39%和10.88%、8.76%、10.02%、26.83%;而‘京科糯2000’以10℃引发处理最高,较对照提高了16.48%、10.73%、14.27%和32.00%。可见,种子引发增强了干旱胁迫下玉米种子的发芽能力,本研究结果可为种子引发在旱地玉米生产上的应用提供理论依据。

SA Priming of Maize Seeds at Different Temperature Under Drought Stress: Effects on Seed Germination and Seedling Physiological Characteristics

The aim is to investigate the effect of SA priming at different temperature on maize seed germination, growth and physiological characteristics of maize seedling under drought stress. The maize varieties ‘Zhengdan 958’, ‘Jingtian 808’ and ‘Jingkenuo 2000’ were used as materials, and five treatments including CK, 5, 10, 15 and 20℃ were designed to study the seedling growth performance under drought stress. The results showed that SA priming significantly enhanced the antioxidant enzyme activities, increased the content of osmotic regulatory substances, and decreased the content of MDA in maize seedling, alleviated the effects of drought stress on the growth of maize. Among them, the maize germination parameters (germination rate, germination potential, germination index and vigor index) of ‘Zhengdan 958’ and ‘Jingtian 808’ were the highest at 15℃ priming treatment, increased by 16.67%, 21.26%, 17.69%, 25.39% and 10.88%, 8.76%, 10.02%, 26.83%, respectively, compared with those of the control; while for ‘Jingkenuo 2000’, the priming temperature of 10℃, could achieve an increase of 16.48%, 10.73%, 14.27% and 32.00% compared with those of the control. In conclusion, seed priming can enhance the germination ability of maize seeds under drought stress, and the study could provide a theoretical basis for the application of seed priming to maize production in dryland.