一氧化氮调控青菜根尖细胞壁过氧化物酶抗镉胁迫的研究

研究了镉胁迫下一氧化氮对青菜幼苗根尖伸长及其木质素生物合成的影响。结果显示：镉处理显著抑制根的生长,并呈现浓度和时间效应;镉处理诱导根尖细胞壁过氧化物酶（CPX）活力的显著上升,并呈现浓度和时间效应;外源一氧化氮供体SNP能够显著缓解镉胁迫对根生长的抑制效应;镉处理显著降低了根尖内源一氧化氮水平,而添加SNP有效提升了镉胁迫下根尖内源一氧化氮水平;添加SNP能够显著缓解镉胁迫诱导的根尖CPX和NADH氧化酶活力的上升以及木质素的合成。这些结果说明一氧化氮可通过抑制青菜幼苗根尖CPX介导的木质素生物合成来抵抗镉胁迫。...

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Bibliographic Details
Published in江西农业学报 Vol. 28; no. 7; pp. 11 - 16
Main Author 吕文静 陈健 杨立飞
Format Journal Article
LanguageChinese
Published 南京农业大学 园艺学院,江苏 南京,210095%江苏省农业科学院 食品质量安全与检测研究所,江苏 南京,210014 2016
Subjects
一氧化氮
木质素
细胞壁过氧化物酶
镉胁迫
青菜
Lignin
Cadmium stress
镉胁迫
细胞壁过氧化物酶
Brassica rapa
木质素
Nitric oxide
青菜
一氧化氮
Cell wall-bound peroxidase
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ISSN1001-8581
DOI10.19386/j.cnki.jxnyxb.2016.07.03

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Summary:研究了镉胁迫下一氧化氮对青菜幼苗根尖伸长及其木质素生物合成的影响。结果显示：镉处理显著抑制根的生长,并呈现浓度和时间效应;镉处理诱导根尖细胞壁过氧化物酶（CPX）活力的显著上升,并呈现浓度和时间效应;外源一氧化氮供体SNP能够显著缓解镉胁迫对根生长的抑制效应;镉处理显著降低了根尖内源一氧化氮水平,而添加SNP有效提升了镉胁迫下根尖内源一氧化氮水平;添加SNP能够显著缓解镉胁迫诱导的根尖CPX和NADH氧化酶活力的上升以及木质素的合成。这些结果说明一氧化氮可通过抑制青菜幼苗根尖CPX介导的木质素生物合成来抵抗镉胁迫。
Bibliography:LV Wen-jing;CHEN Jian;YANG Li-fei （ 1. College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China; 2. Institute of Food Quality Safety and Testing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China）
36-1124/S
Cadmium stress; Nitric oxide; Cell wall-bound peroxidase; Lignin; Brassica rapa
This paper studied the influences of nitric oxide（ NO） on the root tip elongation and lignin biosynthesis of Brassica rapa seedlings under cadmium（ Cd） stress. The results indicated that： Cd treatment induced a remarkable inhibition to the root growth in both dose-dependent and time-dependent manners; Cd treatment resulted in a significant increase in the activity of cell wall-bound peroxidase（ CPX） in root tip in both dose-dependent and time- dependent manners; the exogenous NO donor SNP significantly attenuated the Cd-induced inhibition to root elongation; Cd treatment significantly reduced the content of endogenous NO in root tip,while the addition of SNP effectively enhanced the content of
ISSN:1001-8581
DOI:10.19386/j.cnki.jxnyxb.2016.07.03