UV-B辐射增强对反枝苋形态、生理及化学成分的影响

被引：7

作者：

张瑞桓

刘晓

田向军

岳明

机构：

[1] 西北大学生命科学学院

来源：

生态学杂志 | 2008年 / 11期

关键词：

UV-B辐射; 反枝苋; 形态; 生理; 生物量分配; 化学成分;

D O I：

10.13292/j.1000-4890.2008.0349

中图分类号：

Q948 [植物生态学和植物地理学];

学科分类号：

071012 ; 0713 ;

摘要：

通过大田盆栽实验,研究了2种增强的UV-B辐射对双子叶C4植物反枝苋(Ama-ranthus retroflexus)形态、生理、生物量分配及化学成分的影响。结果表明:增强UV-B辐射处理下分枝数、叶片数、高度和基径均没有显著变化。高、低剂量的UV-B处理均导致过氧化氢酶(CAT)活性显著高于对照组(P<0.05),但对超氧化物歧化酶(SOD)活性无影响,低剂量辐射下过氧化物酶(POD)活性显著高于对照而高剂量辐射下无显著变化,同时丙二醛(MDA)含量随辐射剂量的增加而显著增加(P<0.05)。收获期低剂量辐射处理下的资源分配模式发生变化,分配到叶片的生物量比例显著增加,而分配到根的比例显著减小,但高剂量辐射对生物量分配无影响。UV-B辐射处理下根、茎、叶部所检测的大多数化学成分与对照相比均有显著变化:叶片中可溶性蛋白、木质素和脂肪,根中木质素,茎中纤维素、木质素含量在辐射处理下显著高于对照;叶片中淀粉,茎中可溶性糖、淀粉和脂肪含量在辐射处理下显著低于对照(P<0.05)。

引用

页码：1869 / 1875

页数：7

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