CAJ | 학술논문

为了探讨在盐渍环境下外源生长素对植物生长的调节作用,以抗性玉米品种农大108为材料,研究了50%比例海水处理过程中吲哚乙酸(indole acetic acid,IAA)对玉米幼苗叶片衰老相关指标的影响.结果表明:随着处理时间的延长,叶片中的叶绿素含量以及叶绿素a/叶绿素b降低,类胡萝卜素含量升高,而可溶性蛋白含量、丙二醛含量和超氧物歧化酶活性先上升后下降,说明半海水胁迫可以加快叶片的衰老进程;补充使用不同浓度的吲哚乙酸后,丙二醛水平下降,其余指标保持在较高的水平上,其中0.5 mg/L的吲哚乙酸处理组的衰老指标变化最明显,说明适宜浓度的外源生长素可以延缓海水胁迫造成的植物叶片衰老.
위료탐토재염지배경하외원생장소대식물생장적조절작용,이항성옥미품충농대108위재료,연구료50%비례해수처리과정중신타을산(indole acetic acid,IAA)대옥미유묘협편쇠로상관지표적영향.결과표명:수착처리시간적연장,협편중적협록소함량이급협록소a/협록소b강저,류호라복소함량승고,이가용성단백함량、병이철함량화초양물기화매활성선상승후하강,설명반해수협박가이가쾌협편적쇠로진정;보충사용불동농도적신타을산후,병이철수평하강,기여지표보지재교고적수평상,기중0.5 mg/L적신타을산처리조적쇠로지표변화최명현,설명괄의농도적외원생장소가이연완해수협박조성적식물협편쇠로.
In order to study the regulative function of exogenous auxin on the plant growth during saline stresses, the impacts of indole acetic acid (IAA) on the related indexes of leaf senescence in the seedlings of stress-tolerant maize variety Nongda108 during the treatment of half seawater were studied. The results indicate: while the extent of seawater stress increases, total chlorophyll content as well as the ratio of chlorophyll a / chlorophyll b decreases, and carotenoid content rises in the leaves. However, the content of soluble protein and malondialdehyde (MDA) and superoxide dismutase (SOD) activity ascends,and then declines respectively. This means half seawater can accelerate the senescent progress of leaves. After the treatments of half seawater mixed with IAA at its different ultimate concentrations, MDA content is reduced and other mentioned indexes remain higher level than that of single seawater stress. Among the IAA treatments, the senescent indexes change most evidently especially in the group of 0.5 mg/L. This shows the application of exogenous auxin with appropriate concentration can alleviate the leaf senescence caused by seawater stresses.