Effects of bioorganic selenium on main characters,heavy metal content and selenium absorption of different rice varieties

【Objective】The objective of this research was to screen high-quality rice varieties with good quality, high safety and strong selenium (Se) enrichment ability, so as to provide a reference for the promotion of safe, simple and lowcost selenium-enriched rice production technology, analyzed the effects of bioorganic selenium on agronomic, economic and quality characteristics of different rice varieties, as well as heavy metals and selenium content in rice.【Method】The experiment was carried out with 10 high quality rice varieties mainly planted in Hubei as the experimental materials, bioorganic selenium solution(selenium concentration 50 mg/L) and water(CK) were sprayed on the leaves at the early stage of filling, respectively, samples were taken at 5 points after ripening to detect the agronomic, economic and quality characters, selenium content and heavy metal content of rice in each plot.【Result】The results showed that the biological organic selenium treatment had no significant effect(P>0.05) on rice plant height and effective panicle number, however, the total number of grains per panicle(1.09%-5.52%) and the number of grains per panicle(2.64%-6.54%) of 8 varieties, the 1000-grain weight(0.73%-3.61%) of 9 varieties and the seed setting rate(0.96%-4.81%) of all varieties were increased in different degrees, there by it could achieve increasing production on rice. Bioorganic selenium treatment could improve the quality of rice to a certain extent, the chalkiness of Runzhuxiangzhan and the chalky grain rate of Tianliangyou 616 were decreased by 46.67% and 21.88% compared with CK, respectively, the whole polished rice rate of Jin 214 increased by 8.78%, the gel consistency of Xiangrun 2 reached a significant difference(P<0.05) compared with the CK, and increased by 10.00%. Bioorganic selenium had little influence on grain shape, amylose content and alkali spreading value at the same time. The total selenium content and organic selenium content of the 10 rice varieties could be increased by bioorganic selenium treatment, and the maximum increase reached 394.44% and 453.19%, respectively, and the proportion of organic selenium was more than 95.00%. Meanwhile, it could reduce the content of lead and cadmium in milled rice to a certain extent and improve its safety.【Conclusion】The effects of selenium on rice characteristics and rice selenium enrichment capacity have certain variety differences, comprehensive analysis shows that Jin 214 and Fengliangyouxiang No.1 have better performance in yield, quality and selenium enrichment ability, and can be used as high quality and seleniumenriched rice varieties in Hubei.