摘要
以‘台农一号’芒果(Mangifera indica L.cv.Tainong No.1)盆栽苗离体叶片为试材,研究在增强UV-B辐射条件下芒果不同叶龄叶片的损伤表现和保护响应。结果表明:芒果不同叶龄叶片经增强UV-B辐射处理后,幼叶的相对电导率和MDA含量急剧升高,叶绿素a/b值急剧下降,可溶性蛋白含量发生不稳定地升降变化;而老叶的这4个指标则变化较为缓慢;成年叶表现居中。不同叶龄叶片的叶绿素含量基本无显著变化,幼叶对增强UV-B辐射处理最敏感,老叶则不敏感,成年叶居中。幼叶的SOD和POD活性总体表现出下降趋势,而老叶的维生素C、还原型GSH、类胡萝卜素和类黄酮含量却在增强UV-B辐射处理全程表现增强,且幼叶均表现最低,老叶除后期类黄酮含量降低外均表现最高,成年叶居中。叶片CAT活性在中后期例外地表现为按照老叶、幼叶和成年叶递增。总体上,增强UV-B辐射处理下不同叶龄叶片的损伤表现与其保护能力变化一致。
The detached leaves from the potted young trees of mango,Mangifera indica L. cv. Tainong No. 1,were used to study the damages and the protection response of the leaves with different age under the enhanced UV-B radiation. The results showed that the relative conductivity and the content of MDA of the young leaves increased quickly,the ratio of chlorophyll a/b of the young leaves decreased sharply,the content of soluble protein of the young leaves changed unsteadily,all the 4 indicators of the old leaves mentioned above changed gently,the adult leaves performed medially; the content of chlorophyll in the leaves with different age changed insignificantly,the young leaves were the most sensitive to the enhanced UV-B radiation,the old leaves were not sensitive and the adult leaves performed medially; the activities of SOD and POD decreased; with the enhance of UV-B radiation,the contents of VitC,reduced GSH,carotenoids and flavonoids in old leaves increased,the adult leaves performed medially; the activity of CAT got higher and higher in turn of the old,the young and the adult leaves during the middle and late periods exceptionally. In general,the damages of the leaves with different age were in line with their protection abilities under the enhanced UV-B radiation.
出处
《热带生物学报》
2010年第4期350-356,共7页
Journal of Tropical Biology
基金
海南省自然科学基金项目资助(807005)
关键词
芒果
叶龄
叶片
增强UV-B辐射
损伤
保护
Mango
leaves with age
leaves
enhanced UV-B radiation
damages
protections
