干旱区生态环境知识资源中心(Arid): 沙漠植物抗氧化酶活性及渗透调节物质含量与光合作用的关系

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	沙漠植物抗氧化酶活性及渗透调节物质含量与光合作用的关系
其他题名	Relationship of Antioxidant Enzyme and Osmoregulation Substance to Photosynthese in Several Desert Plants
	杨淑琴 1; 周瑞莲 1; 梁慧敏 2; 赵哈林3 ; 赵学勇3
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2015
卷号	35 期号:6 页码:1557-1564
中文摘要	以科尔沁沙地生长的沙漠植物差不嘎蒿(Artimisia halodendron)、小叶锦鸡儿(Caragana microphylla)、扁蓄豆(Ruthenian medic)、胡枝子(Lespedeza bicolor)、黄柳(Salix gordejevii)和猪毛菜(Salsola collina)为材料,研究了自然状况下光合作用、保护酶活性及渗透调节物质含量的日变化特征及相关关系。结果表明:(1)5个C_3植物光合作用日变化为中午降低类型,净光合速率(P_n)在10:00到达第1个高峰,在14:00出现第2个高峰,其中4个植物第2高峰平均P_n仅为第1高峰的37%。C_4植物猪毛菜光合作用为单峰型。(2)在第1个P_n高峰期间,伴随着光合有效辐射(PAR)增高6.5倍和气温(T_a)增高,叶片水分亏缺度(VPD)增加3~6倍、气孔导度(G_s)下降60%;叶片丙二醛(MDA)含量增加18%,P_n增加3~13倍;过氧化物酶(POD)活性(除了扁蓄豆)平均增高29%、过氧化氢酶(CAT)活性(除胡枝子)平均增加82%;叶片可溶性糖含量增加48%,脯氨酸含量(除差不嘎蒿)增加74%。 (3)午间和午后在大气PAR和T_a较高、叶片VPD较大、MDA含量和P_n下降时,渗调节物含量和抗氧化酶活性仍维持较高水平。日间叶片光合特性与保护酶活性和渗透调节物质含量的日变化间具有一定的相关性。抗氧化酶(尤其是POD和CAT)和渗透调节物(脯氨酸和可溶性糖)不仅在P_n增加过程中维护细胞氧自由基代谢和水分代谢平衡,而且在P_n较低时抑制膜脂过氧化和维持水分平衡,因此它们在日间提高P_n和恢复叶片光合作用上起重要的生理保护作用。6种植物参与抗逆生理调节的抗氧化酶和渗透调节物种类上差异显著。
英文摘要	The daily changes in photosynthetic characteristics,antioxidant enzyme activities and osmoregulation substance contents were investigated in response to daily variation of radiation in six desert palnts,Caragana microphylla,Salsola collina,Ruthenian medic,Lespedeza bicolor,Salix gordejevii,and Salsola collinain the Horqin Sandy Land,Inner Mongolia,China to understand how correlation of photosynthetic characteristics was with antioxidant enzyme activities and osmoregulation substance contents.The results obtained are as followes: (1).The diurnal changes of photosynthestic rate of five C_3 desert plants belong to noon-sescent type.The first net photosynthetic rate (P_n) was peaked at 10:00 am,second one was at 14:00 pm which was only 37% of first P_n in four C_3 desert plants(C.microphylia,R.medic,L.bicolor,S.gordejevii).While Salsola collina (C_4) was unimodal type.(2) During reaching first peak of P_n,with rising up of radiation(PAR)and air temperature(T_a) from 6:00 am,vapor pressure dificit(VPD)increased by 3-6 times,stomata condition(Gs)decreased by 60%,as same times contents of malondialdehyde(MDA) and soluble sugar and proline(exception A.halodendron)increased by 18%,48% and 74%;the activities of peroxidase(POD)(exception R.mecid) and CAT(exception L.bicolor)raised by 29% and 82%;Pnincreased by 3-13 times among the six plants. (3)During the noon and after noon,when PAR and Tawere higher,Pndecreasing was accompanied with increasing of Gs and VPD,and the leaves still hold higher in contents of proline and soluble sugar and stronger in activities of antioxidant enzyme.It suggested that diurnal photosynthetic characteristics was correlated with antioxidant enzyme activities and osmoregulation substance contents.Antioxidant enzyme (specialy POD and CAT) and osmoregulation substance(proline and soluble sugar)not only preserved metabolism balance of active oxygen free radicals and water and in physiological protective fuction for the photosynthese of desert plants when Pnrised,but also played physiogical regulation role in recovering of photosnthese and cell normal metabolism. But six desert plants have different antioxidant enzymes and osmoregulation substances involved in adpting to desert environment.
中文关键词	科尔沁沙地 ; 沙漠植物 ; 光合日变化 ; 抗氧化酶 ; 渗透调节物
英文关键词	Horqin Sandy Land desert plants diurnal photosynthese changes antioxidant enzyme osmoregulation substance
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:5583206
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233790
作者单位	1.鲁东大学生命科学学院, 烟台, 山东 264025, 中国; 2.江苏农林职业技术学院江苏省农业种质资源保护与利用平台, 句容, 江苏 212400, 中国; 3.中国科学院寒区旱区环境与工程研究所, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	杨淑琴,周瑞莲,梁慧敏,等. 沙漠植物抗氧化酶活性及渗透调节物质含量与光合作用的关系[J]. 中国科学院西北生态环境资源研究院,2015,35(6):1557-1564.
APA	杨淑琴,周瑞莲,梁慧敏,赵哈林,&赵学勇.(2015).沙漠植物抗氧化酶活性及渗透调节物质含量与光合作用的关系.中国沙漠,35(6),1557-1564.
MLA	杨淑琴,et al."沙漠植物抗氧化酶活性及渗透调节物质含量与光合作用的关系".中国沙漠 35.6(2015):1557-1564.