中国生态农业学报（中英文）2026，Vol.34Issue(4)：852-863,12.DOI:10.12357/cjea.20250347
外源复合有机酸对酸性土壤水稻硒吸收积累的调控效应
Regulatory effects of exogenous combined organic acid on selenium uptake and accumulation in rice under acidic soil conditions
摘要
Abstract
Given the scarcity research on the activation of selenium(Se)by organic acids in acidic soils,a pot experiment was conducted to investigate the effects of different amounts of exogenous compound organic acids(COA)on the uptake and transport of Se in rice as well as soil properties under acidic soil conditions,providing technical support for the production of Se-enriched rice.This study consisted of four treatments:0 COA(CK),0.23 mg·kg-1 COA(LOA),1.14 mg·kg-1 COA(MOA),and 2.28 mg·kg-1 COA(HOA).The results showed no significant difference in grain yield or aboveground biomass of rice between CK and COA treatments under the equal application of Se[0.5 mg(Se)·kg-1].However,LOA and MOA treatments significantly increased the Se content in rice grains by 28.7％and 27.3％and the accumulative amount of Se in the whole plant by 40.1％and 34.1％,respectively,compared with CK.In contrast,the HOA treatment significantly decreased the Se content and accumulation in rice stems compared with CK,with reductions of 23.5％and 46.7％,respectively.The data indicated that the LOA and MOA treatments effectively enhanced Se uptake and transport,while the HOA treatment inhibited the transport of Se from the roots to stems.Additionally,the COA treatments significantly increased the available phosphorus content in the rhizosphere soil and the available Se content in the non-rhizosphere soil,decreased the available sulfur content in both the rhizosphere and non-rhizosphere soils,and enhanced the activities of catalase(CAT)and peroxidase(POD)in the roots.Particularly,the MOA treatment significantly increased soil urease activity(UE).The LOA treatment reduced the dissolution effect of root activities on kaolinite minerals,while the HOA treatment exerted a promoting effect.Principal component analysis indicated that soil UE activity and root CAT activity made significant contributions to the uptake and accumulation of Se in plants.In conclusion,exogenous addition of 0.23-1.14 mg·kg-1 COA can improve the availability of soil Se,enhance the activities of CAT and POD in rice roots,and significantly increase the Se content in various parts of rice(2.52-8.56 mg·kg-1)and the Se accumulation in plants(177.2-185.2 μg·plant-1).This study provides new ideas and approaches for enhancing the Se content in rice grains and has important theoretical and practical significance for meeting the human need for Se.关键词
水稻/酸性土壤/复合有机酸/硒吸收与积累/硒生物富集系数Key words
rice/acid soil/combined organic acids/Se absorption and accumulation/Se biological concentration factor分类
农业科技引用本文复制引用
易琼,丁武汉,曾科,吴腾飞,Kamontip Raorat,张木,唐拴虎..外源复合有机酸对酸性土壤水稻硒吸收积累的调控效应[J].中国生态农业学报（中英文）,2026,34(4):852-863,12.基金项目
国家自然科学基金项目(42107374)、广东省农业科学院"金颖之星""金颖之光"学科带头人培养计划项目(R2023PY-JX020,R2023PY-JG017)和广东省省级科技计划项目(2022A0505020002)资助 This study was supported by the National Natural Science Foundation of China(42107374),the"Golden Star"and"Golden Light"Discipline Leader Training Program of Guangdong Academy of Agricultural Sciences(R2023PY-JX020 and R2023PY-JG017),and Science and Technology Plan Project of Guangdong Province(2022A0505020002). （42107374）
