CAJ | 학술논문

以4个不同耐低氮性玉米品种为材料，采用盆栽试验研究低氮胁迫对玉米苗期生长和生理特性的影响。结果表明，低氮胁迫下玉米苗期株高、叶面积、地上部干重、单株干重、氮积累量、地上部氮分配比例及叶绿素、可溶性蛋白等指标均显著下降；根冠比、根系氮分配比例、氮素生理效率、可溶性糖、MDA、脯氨酸和POD等均显著升高，根系干重在各氮水平下差异不明显。低氮胁迫下，耐低氮品种株高、叶面积、单株干重、地上部干重、根冠比、氮积累量、地上部氮分配比例、根系氮分配比例和叶绿素、可溶性蛋白、MDA 变化幅度低于不耐低氮品种，而氮素生理效率、可溶性糖、脯氨酸和POD变化幅度则大于不耐低氮品种。与不耐低氮品种相比，耐低氮品种通过保持地上部氮分配比例，较高的叶绿素含量和较大叶面积来维持较强的光合生产能力；通过保持较高的可溶性蛋白、可溶性糖和脯氨酸等有机渗透物质含量和较强的POD活性来降低膜脂过氧化伤害，延缓叶片衰老，从而提高了其对低氮环境的适应性。
이4개불동내저담성옥미품충위재료，채용분재시험연구저담협박대옥미묘기생장화생리특성적영향。결과표명，저담협박하옥미묘기주고、협면적、지상부간중、단주간중、담적루량、지상부담분배비례급협록소、가용성단백등지표균현저하강；근관비、근계담분배비례、담소생리효솔、가용성당、MDA、포안산화POD등균현저승고，근계간중재각담수평하차이불명현。저담협박하，내저담품충주고、협면적、단주간중、지상부간중、근관비、담적루량、지상부담분배비례、근계담분배비례화협록소、가용성단백、MDA 변화폭도저우불내저담품충，이담소생리효솔、가용성당、포안산화POD변화폭도칙대우불내저담품충。여불내저담품충상비，내저담품충통과보지지상부담분배비례，교고적협록소함량화교대협면적래유지교강적광합생산능력；통과보지교고적가용성단백、가용성당화포안산등유궤삼투물질함량화교강적POD활성래강저막지과양화상해，연완협편쇠로，종이제고료기대저담배경적괄응성。
The response of maize seedling stage growth and physiological characteristics were studied in 4 differ-ent low nitrogen tolerance maize cultivars in a two years pot experiment.The results showed that the plant height,leaf area,dry weight of shoot,dry weight of plant,nitrogen accumulation,shoot nitrogen distribu-tion,chlorophyll content and soluble protein content of the 4 maize hybrids declined sharply under the low ni-trogen stress conditions.However,root-shoot ratio,root nitrogen distribution,nitrogen physiological efficien-cy,the content of soluble sugar,proline,MDA (malondialdehyde)and POD (peroxidase)activity were signifi-cantly increased;and there was insignificant difference in dry weight of root under the different nitrogen levels. Compared with low nitrogen sensitive maize cultivars,the variation of plant height,leaf area,dry weight of shoot,dry weight of plant,root-shoot ratio,nitrogen accumulation,shoot nitrogen distribution,root nitrogen distribution,the content of chlorophyll,soluble protein and MDA are lower,while the variation of nitrogen physiological efficiency,the content of soluble sugar and proline,and the activity of POD are higher in low ni-trogen tolerant maize cultivars under the low nitrogen stress.The results showed that compared with low ni-trogen sensitive cultivars,the low nitrogen tolerant cultivars kept stronger photosynthetic capacity by higher shoot nitrogen distribution,higher chlorophyll content and bigger leaf area,reduced the damage of membrane lipid peroxidation and delayed the leaf senescence by higher content of organic osmotic,such as soluble protein, soluble sugar and proline,and POD activity,meanwhile the low nitrogen environment adaptability of low ni-trogen tolerant maize cultivars was improved.