稀土元素对增强UV-B辐照下小麦抗氧化酶的影响  

EFFECTS OF RARE EARTH ELEMENTS ADDING ON ANTIOXIDANT ENZYMES OF WHEAT UNDER ENHANCED ULTRAVIOLET-B RADIATION

作　　者：张美萍[1,2] 江玉珍[1] 于光辉[1] 苑中原[1] 陈国祥[1] 

机构地区：[1]南京师范大学生命科学学院/江苏省生物多样性与生物技术重点实验室,江苏南京210097 [2]山西师范大学生命科学学院,山西临汾041004

出　　处：《核农学报》2009年第2期316-319,共4页Journal of Nuclear Agricultural Sciences

基　　金：国家自然基金(30771299)

摘　　要：盆栽条件下,研究了增强紫外线B(UV-B,280～320nm)辐照对小麦幼苗抗氧化酶的影响以及施用稀土元素后的修复作用。结果表明,与对照(CK)相比,增强UV-B辐照处理的小麦幼苗过氧化氢酶(CAT)、过氧化物酶(POD)活性和丙二醛(MDA)含量显著升高(P<0.05),而超氧歧化酶(SOD)活性有所升高,峰值后移。施用稀土元素后可以抑制由于紫外线辐照所导致的MDA含量及POD活性的增加,且SOD、CAT的活性增强,提高了清除活性氧的能力,减弱了UV-B辐照对小麦抗氧化酶的影响。研究发现,各施用浓度为0.3%、0.1%和0.075%的稀土元素处理下,以0.075%的处理对紫外线B的抗逆效应最好。施用适量的稀土元素可改变小麦的抗氧化酶活性,提高小麦抗逆性。This effects of rare earth elements adding on the antioxidant enzymes of wheat under enhanced Uhraviolet-B radiation （UV-B） was studied in pot experiments. The results showed that enhanced UV-B significantly increased the content of MDA and activities of CAT and POD （ p 〈 0.05 ）, but no obvious increasing of SOD activity, except the activity peak moved afterwards. Spraying earth elements on the wheat could inhibit the increasing of MDA content and POD activity induced by the UV-B, meanwhile, the activities of SOD and CAT increased, which means the capability of active oxygen removing improved and consequently alleviated the damage of enhanced UV-B. Among the three concentrations of 0.3 %, 0.1% and 0.075 % applied the wheat, 0. 075 % earth elements adding induced the highest antioxide capability. A suitable amount of rare earth elements could increase antioxidant enzymes of the wheat to decrease UV-B damage.

关 键 词：小麦 增强UV-B辐照 稀土元素 抗氧化酶 

分 类 号：S512.1[农业科学—作物学]