中国水稻科学2017，Vol.31Issue(1)：65-71,7.DOI:10.16819/j.1001-7216.2017.6069
滴灌条件下不同价态外源硒对水稻硒吸收及转运的影响
Effects of Selenium Valence on Its Uptake and Translocation in Rice Under Drip Irrigation
摘要
Abstract
[Objective]To lay a theoretical base for the development of selenium-enriched rice,a field plot experiment was performed to study the effects of selenate and selenite on selenium transformation and bioavailability under drip irrigation.[Method]The experiment consisted of two factors:(i)amount of Se fertilizer (0.3,0.6,and 1 .2 kg/hm2 ), (ii)type of Se fertilizer (selenate and selenite).[Result]The results indicated that selenate application at the level of 12 kg/hm2 resulted in the highest soluble selenium concentration one day after fertilization (340% higher than control),1 .2 kg/hm2 selenite application resulted in the highest exchangeable selenium,Fe oxide-bound selenium and organic matter-bound selenium concentrations four days after fertilization (380%,56%,59% higher than control).It could be seen that selenate mainly existed in soluble form in soil,while selenite could be transformed from the soluble form to other three forms,which decreased its bioavailability.We found that under selenite treatment selenium concentration in leaves and seeds was significantly lower than that under selenate treatment.However,under selenite treatment,the selenium content in root was significantly higher than that under selenate treatment.[Conclusion]The selenium accumulations in shoot and root of rice were significantly higher under selenate treatments than those under the selenite treatments.Compared with the selenate treatment, absorption index, primary transport index and secondary transport index were lower in the selenite treatment.In conclusion,selenite has higher bioavailability than selenite in drip irrigation.关键词
硒酸盐/亚硒酸盐/水稻/生物有效性Key words
selenite/selenate/rice/bioavailability分类
农业科技引用本文复制引用
张栋,史力超,冶军,侯振安,王存虎,吴永海..滴灌条件下不同价态外源硒对水稻硒吸收及转运的影响[J].中国水稻科学,2017,31(1):65-71,7.基金项目
国家科技支撑计划资助项目(2012BAD42B02). （2012BAD42B02）
