裸果木对模拟渗透胁迫的生理响应
Physiological responses of Gymnocarpos przewalskii to simulated osmotic stress
目的 探究裸果木幼苗叶片对PEG渗透胁迫的生理响应规律,为揭示裸果木抗旱生理机制提供理论依据。 方法 以裸果木幼苗为试验材料,采用不同浓度(0%,5%,10%,15%,20%)的PEG-6000分别处理8 h和24 h,测定叶片的部分水分生理指标和抗氧化指标。 结果 在PEG胁迫下,裸果木幼苗叶片的相对含水量显著下降。在胁迫24 h时,随PEG浓度增大,束缚水含量/自由水含量呈现先显著升高后降低的趋势。脯氨酸和可溶性糖含量在PEG胁迫时呈波动变化,但胁迫24 h时达到最大值。丙二醛(MDA)含量随着PEG胁迫程度的增加而上升,胁迫24 h时,所有处理的MDA含量均显著高于对照。过氧化氢含量在PEG胁迫8 h和24 h时均较对照显著升高。超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)活性对8 h和24 h的PEG胁迫响应均达显著水平,过氧化物酶(POD)活性在胁迫24 h时显著增强。 结论 PEG渗透胁迫24 h对裸果木幼苗造成明显的过氧化伤害,增加叶片束缚水比例,主动积累脯氨酸和可溶性糖,增强SOD、CAT、APX和POD酶活性是裸果木适应渗透胁迫的主要方式。
Objective To study the response of Gymnocarpos przewalskii seedlings to PEG stress in order to provide a reference for elucidating the drought resistance mechanism of G.przewalskii. Method Under drought stress,the relative water content of the leaves of G.przewalskii seedlings decreased significantly.The ratio of bound to free water content first increased significantly and then decreased with increasing PEG concentration under 24 h stress.The content of proline and soluble sugars fluctuated under PEG stress and accumulated significantly under 24 h PEG stress.The content of malondialdehyde (MDA) increased with the increase of PEG stress and was significantly higher than that of the control under 24 h stress.Hydrogen peroxide levels increased significantly under PEG stress for 8 h and 24 h compared to the control.The activity of superoxide dismutase (SOD),catalase (CAT) and ascorbic acid peroxidase (APX) reached the significant level compared to the control under PEG stress for 8 h and 24 h,and the activity of peroxidase (POD) increased significantly under 24 h stress. Conclusion PEG stress for 24 h caused significant peroxidative damage to G.przewalskii seedlings.The main adaptation of G.przewalskii seedlings to osmotic stress was to increase the amount of bound water,to actively accumulate proline and dissolved sugars,and to increase the activity of SOD,POD,CAT and APX.
Gymnocarpos przewalskii seedling / osmotic regulators / antioxidant enzymes / PEG stress
| [1] |
王静,王海芳,花立民, |
| [2] |
马松梅,张明理,张宏祥, |
| [3] |
王竞红,陈艾,张雯, |
| [4] |
秦立刚,李雪,李韦瑶, |
| [5] |
|
| [6] |
肖姣娣.不同强度干旱胁迫对刺槐幼苗生理生化特性的影响[J].中南林业科技大学学报,2015,35(8):23-26. |
| [7] |
吴雨涵,刘文辉,刘凯强, |
| [8] |
|
| [9] |
|
| [10] |
邱真静,李毅,种培芳.PEG胁迫对不同地理种源沙拐枣生理特性的影响[J].草业学报,2011,20(3):108-114. |
| [11] |
严子柱,李爱德,李得禄, |
| [12] |
杨赵平,徐雅丽,李志军.裸果木叶片的解剖结构与生态适应性[J].安徽农业科学,2011,39(7):3929-3931. |
| [13] |
王亮,黄海霞,杨增武, |
| [14] |
黄海霞,连转红,王亮, |
| [15] |
王韶唐.植物的水分利用效率和旱地农业生产[J].干旱地区农业研究,1987(2):67-80. |
| [16] |
刘俊,吕波,徐朗莱.植物叶片中过氧化氢测定方法的改进[J].生物化学与生物物理进展,2000,27(5):548-551. |
| [17] |
李合生,孙群,赵世杰, |
| [18] |
高俊凤.植物生理学实验指导[M].北京:高等教育出版社,2006. |
| [19] |
邹琦.植物生理学实验指导[M].北京:中国农业出版社,2000. |
| [20] |
刘璐,武志博,李晓佳, |
| [21] |
党晓宏,高永,虞毅, |
| [22] |
刘海卿,孙万仓,刘自刚, |
| [23] |
赵杰.PEG-6000胁迫对忍冬科四种植物的生理影响[D].长春:吉林农业大学,2011. |
| [24] |
马彦军,马瑞,曹致中, |
| [25] |
王磊,汤家鑫,高兴国, |
| [26] |
|
| [27] |
|
| [28] |
马鹏图,苏世平,李毅, |
| [29] |
王凯,逄迎迎,吕林有, |
| [30] |
彭亮,杨冰月,张岗, |
| [31] |
江登辉,刘晓颖,陈乾, |
| [32] |
高鹏飞,张静,范卫芳, |
| [33] |
张智猛,戴良香,宋文武, |
| [34] |
覃奎,刘秀,马道承, |
| [35] |
张净口,王锦霞,郭萌萌, |
| [36] |
谢志玉,张文辉.干旱和复水对文冠果生长及生理生态特性的影响[J].应用生态报,2018,29(6):1759-1767. |
| [37] |
杨利,王波,李文姣, |
| [38] |
|
| [39] |
黄子峰,王凤兰,黄宇航.干旱胁迫和复水对一品红生理特性的影响[J].广东农业科学 2014,5:100-104. |
| [40] |
|
| [41] |
黄尧瑶,邓明华,彭春秀, |
| [42] |
徐松华.逆境条件下植物体内活性氧代谢研究进展[J].安徽农学通报,2021,27(21):29-32. |
| [43] |
阎秀峰.干早胁迫对红松幼苗保护酶活性及脂质过氧化作用的影响[J].生态学报,1999,l9(6):850-854. |
| [44] |
崔秀妹,刘信宝,李志华, |
| [45] |
陈浩维,邓明华,黄尧瑶, |
| [46] |
崔鹏,黄海霞,杨琦琦.裸果木幼苗生物量和抗氧化酶活性对土壤干旱胁迫的响应[J].中国水土保持科学,2020,18(5):112-118. |
甘肃农业大学学科建设专项基金(GSAU-XKJS-2018-110)
/
| 〈 |
|
〉 |