UV-B辐射增强对反枝苋形态、生理及化学成分的影响

生态学杂志

UV-B辐射增强对反枝苋形态、生理及化学成分的影响

张瑞桓;刘晓;田向军;岳明

西北大学生命科学学院，西安 710069

收稿日期:2008-04-22 修回日期:1900-01-01 出版日期:2008-11-10 发布日期:2008-11-10

Effects of enhanced UV-B radiation on the morphology, physiology, and chemical composition of Amaranthus retroflexus.

ZHANG Rui-huan; LIU Xiao; TIAN Xiang-jun; YUE Ming

College of Life Science, Northwest University, Xi’an 710069, China

Received:2008-04-22 Revised:1900-01-01 Online:2008-11-10 Published:2008-11-10

摘要/Abstract

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（Amaranthus 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）。

关键词: 太白红杉, 空间分布, 聚集分布型, 尺度

Abstract: With field pot experiment, the effects of two dosages of enhanced UV-B radiation on the morphology, physiology, biomass allocation, and chemical composition of C₄ plant Amaranthus retroflexus were studied. The results indicated that under the effects of enhanced UV-B radiation, the branch number, leaf number, plant height, and stem diameter had less change, the plant CAT activity was significantly higher than that of the control (P<0.05), but the SOD activity was less affected. The POD activity was significantly higher than the control under low dosage UV-B radiation, but had less change under high dosage UV-B radiation. The MDA content increased with increasing UV-B radiation (P<0.05). Under low dosage UV-B radiation and at harvest, the biomass allocation in leaf increased significantly but that in root was in adverse; while under high dosage UV-B radiation, less change was observed in the allocation. UV-B radiation induced significant changes in the chemical composition of root, stem, and leaf. Under UV-B radiation, the soluble protein, lignin, and fat contents in leaf, lignin content in root, and cellulose and lignin contents in stem were increased, while the starch content in leaf and the soluble sugar, starch, and fat contents in stem were decreased significantly (P<0.05), compared with the control.

Key words: Larix chinensis population, Spatial distribution, Clustering pattern type, Scale

张瑞桓;刘晓;田向军;岳明. UV-B辐射增强对反枝苋形态、生理及化学成分的影响[J]. 生态学杂志.

ZHANG Rui-huan; LIU Xiao; TIAN Xiang-jun; YUE Ming. Effects of enhanced UV-B radiation on the morphology, physiology, and chemical composition of Amaranthus retroflexus.[J]. cje.

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