江苏农业学报2025，Vol.41Issue(12)：2298-2306,9.DOI:10.3969/j.issn.1000-4440.2025.12.002
不同时期施硒对水稻硒吸收及累积的影响
Effects of selenium application at different growth stages on selenium up-take and accumulation in rice
摘要
Abstract
To investigate the effects of selenium application at different growth stages on selenium enrichment in rice un-der acidic soil conditions in South China and the mechanism of selenium accumulation in rice,and to provide a basis for the pro-duction of selenium-enriched rice,this study conducted field experiments with four treatments:no selenium application as control(CK),selenium application at the tillering stage(T1),selenium application at the jointing stage(T2),and selenium applica-tion at the filling stage(T3).Measurements were conducted on selenium content in rice grains,hierarchical leaf selenium con-tent,hierarchical stem selenium content,hierarchical node selenium content,root selenium content,organic selenium content in grains,and the relative expression level of the transporter gene OsNRT1.1B.The results demonstrated that selenium application markedly enhanced grain selenium content.In particular,applying selenium at the filling stage led to a sig-nificant increase in organic selenium content compared to the control.Furthermore,delayed selenium application resulted in progressively higher grain selenium levels,whereas leaf selenium content exhibited a declining trend.Selenium appli-cation significantly increased the selenium content in rice stems.The selenium content in rice stems showed no significant diffe-rence between the T2 and T3 treatments.However,selenium content in rice stems under T2 and T3 treatments was significantly higher than that under T1 treatment.While selenium application reduced the proportion of selenium accumulation in rice grains,application at the filling stage significantly increased the organic selenium content in grains compared to applications at the tille-ring and jointing stages.Selenium application at the filling stage significantly up-regulated the relative expression level of the transporter gene OsNRT1.1B,thereby increasing the translocation factor of selenium from stems and leaves to the grains.Delaying selenium fertilizer application redirects selenium from being accumulated in vegetative organs to being translocated and accumula-ted in the grains.关键词
水稻/硒/累积/转运蛋白基因/酸性土壤Key words
rice/selenium/accumulation/transporter gene/acidic soil分类
农业科技引用本文复制引用
李婵琼,易琼,曾科,丁武汉,唐拴虎,张木..不同时期施硒对水稻硒吸收及累积的影响[J].江苏农业学报,2025,41(12):2298-2306,9.基金项目
国家自然科学基金项目(42107374) （42107374）
广东省省级科技计划项目(2022A0505020002) （2022A0505020002）
广东省农业科学院中青年学科带头人培养计划项目(R2023PY-JG017) （R2023PY-JG017）
