土壤学报2019，Vol.56Issue(1)：186-194,9.DOI:10.11766/trxb201805110096
不同施硒方式对水稻硒利用效率的影响
Effects of Different Selenium Application Methods on Se Utilization Efficiency of Rice
摘要
Abstract
[Objective] Application of Se fertilizer is an important agronomic rice Se biofortification measure, and is usually done in two ways, i.e. foliar spray (FS) and application in soil (SA) . However, as affected by the way of Se application, Se absorption and translocation of Se into rice grain varies in mechanism. Therefore, it is of great practical significance to study the differences between the two Se application methods in effect on Se absorption and translocation and nutritional quality of rice. [Method]A pot experiment was conducted to study mechanisms of FS and SA affecting Se biofortification and nutritional quality of rice grains. [Result] Results show that the two methods did not vary much in effect on rice growth. The same in Se application rate, the two methods both increased Se content in rice shoot and grain significantly. However, the content of Se in rice shoot and grain was 8.9 and 5.3 times as high in SA as in FS, respectively, which indicates that SA could more effectively increase Se content in rice grain than FS. But the distribution coefficient of Se in grain was 2 times higher in FS than in SA, which demonstrates that the mechanism of transporting Se from leaf into grain was more effective than that from root to grain.However, no significant effect on Se form in rice grains relative to Se application method, which indicates that Se application methods affected only transport, rather than assimilation of Se in rice. SA could significantly increase the contents of magnesium (Mg) , sulfur (S) , iron (Fe) , manganese (Mn) and zinc (Zn) in rice grain. Compared with the control (No Se applied) , SA and FS was 8％ and 4.5％ higher in content of crude protein in rice grain, respectively, which shows that Se can improve nutritional quality of rice, and the effect of SA was more significant than that of FS. Meanwhile, Se application can also increase the content of serine (Ser) and tyrosine (Tyr) as compared with CK, and, the effect on Tyr was more significant in SA than that in FS or 1.15 times as higher in the former than in the latter. [Conclusion]Therefore, considering cost-effectiveness, SA is better than FS in applying selenate, for it improves more significantly Se content and nutritional quality of rice grains.关键词
水稻/土壤施硒/叶面喷施/生物强化/营养品质Key words
Rice/Soil selenium application into soil/Foliar selenium application/Biofortification/Nutritional quality分类
农业科技引用本文复制引用
张城铭,周鑫斌..不同施硒方式对水稻硒利用效率的影响[J].土壤学报,2019,56(1):186-194,9.基金项目
国家自然科学基金项目(31672238)和重庆市基础科学与前沿技术研究(cstc2017jcyjAX0425)资助 （31672238）
Supported by the Nationa1 Natura1 Science Foundation of China (No. 31672238) and the Program of Basic Research and Frontier Techno1ogy of Chongqing in China (No.cstc2017jcyjAX0425 ) （No. 31672238）
