硝态氮诱导细胞分裂素强化燕麦锶富集机制的研究  

A study of the mechanism of nitrate nitrogen-induced cytokinin enhancement of strontium enrichment in Avena sativa

作　　者：亓琳[1,2] 包云 杨莹博 王晓凌 赵威 QI Lin;BAO Yun;YANG Ying-bo;WANG Xiao-ling;ZHAO Wei(College of Agriculture,Henan University of Science and Technology,Luoyang 471023,China;Shangqiu Station of National Field Agro-ecosystem Experimental Network,Farmland Irrigation Research Institute,CAAS,Shangqiu 453000,China;Department of Geography Science,School of Geography and Environment,Xianyang Normal University,Xianyang 712000,China)

机构地区：[1]河南科技大学农学院,河南洛阳471023 [2]河南商丘农田生态系统国家野外科学观测研究站,中国农业科学院农田灌溉研究所,河南商丘453000 [3]咸阳师范学院地理与环境学院地理科学系,陕西咸阳712000

出　　处：《草业学报》2024年第10期74-82,共9页Acta Prataculturae Sinica

基　　金：国家自然科学基金(317000367);河南省自然科学基金(222300420147);中国农业科学院农田灌溉研究所开放基金(FIRI2019-02-0104)资助。

摘　　要：为探明硝态氮对燕麦锶富集能力的影响,以燕麦内蒙科艺1号为试验材料,采用土培盆栽试验,施加3个水平的金属锶(0、400和800 mg·kg^(-1))和两个水平的硝态氮(0和100 mmol·L^(-1))处理,在硝态氮处理30 d后,研究硝态氮在锶污染条件下对燕麦锶的富集和分布特征,生长指标以及叶片细胞分裂素浓度的影响。结果表明:1)燕麦幼苗的干重随着锶浓度的升高呈现降低的趋势,硝态氮缓解了金属锶对燕麦生长的抑制作用;2)燕麦富集锶的能力表现为根>叶>茎,硝态氮促进了燕麦对锶的富集作用,提高了燕麦对锶的转运系数;3)细胞分裂素含量随着硝态氮施加浓度增加而增加。细胞分裂素含量与转运系数呈正相关。综上所述,燕麦根部富集锶的能力最强;硝态氮可以诱导燕麦中细胞分裂素含量增加,促进其对锶的抗性。此研究可为强化植物修复锶污染土壤的研究提供理论依据。This research investigated the effect of nitrate nitrogen on strontium enrichment ability of oat(Avena sativa)seedlings.The oat variety“Neimengkeyi-1”was used in the experiment.Three levels of strontium(0,400 and 800 mg·kg^(-1))and two levels of nitrate nitrogen(0 and 100 mmol·L^(-1))were applied as treatments in a pot experiment.After 30 days of nitrate nitrogen treatment,the strontium uptake and distribution patterns,growth index,and leaf cytokinin concentration of the oat seedlings were examined.It was found that:1)The dry weight of oat seedlings decreased with increasing concentration of strontium.However,nitrate nitrogen alleviated the inhibitory effect of the strontium on the growth of the oats.2)The ability of oat tissues to accumulate strontium ranked:root>leaf>stem.Nitrate nitrogen promoted the accumulation of strontium and increased the strontium translocation of strontium within oat seedlings.3)The cytokinin concentration increased with increase in the nitrate nitrogen concentration.The cytokinin concentration was positively correlated with the translocation factor.In conclusion,capacity for strontium accumulation was strongest in the roots.Nitrate nitrogen enhanced increase in cytokinin concentration on exposure to strontium and the resistance to strontium in oats.This study provided data applicable to strengthening phytoremediation of strontium contaminated soil.

关 键 词：燕麦 锶 富集 细胞分裂素 

分 类 号：X53[环境科学与工程—环境工程] X173[农业科学—作物学] S544.9