Study on the Effect of "Glimmer" on Cadmium Absorption and Yield of Rice

[Objectives]The effects of"Glimmer"treatment on dry matter accumulation,yield and cadmium accumulation in different types of rice varieties were investigated,in order to provide a theoretical basis for the regulation of low cadmium accumulation in rice grains.[Methods]Under the treatment of cadmium contaminated soil with a concentration of 0.58 mg/kg,the effects of"Glimmer"treatment on dry matter accumulation,yield and cadmium content of different rice varieties were studied by pot experiment.[Results]Spraying"Glimmer"can increase the biological yield of rice,and the different types of rice showed the order of conventional rice>two-line hybrid rice>three-line hybrid rice.Among the conventional rice,most significant increase was observed in Huanghuazhan,and in two-line hybrid rice,C Liangyou 651 increased the most.The"Glimmer"treatment had an obvious yield increasing effect on conventional rice,among which such two varieties as Xiangwanxian 13 and Huanghuazhan had the largest increases,followed by the two-line hybrid rice,and a little effect was observed on the three-line hybrid rice.The"Glimmer"treatment resulted in a significant reduction in cadmium content in different types of rice,which decreased by 13.33%-26.09%,and seven varieties showed a reduction over 21.74%.[Conclusions]The"Glimmer"treatment can significantly reduce the cadmium content in rice,and generally promote the dry matter accumulation and yield increase of rice,of which conventional rice performed better.

Screening and Analysis of Cadmium-tolerant Rice Variety Resources

In order to find out the difference in cadmium tolerance of different rice varieties in central Hunan,26 varieties of conventional rice,two-line hybrid rice and three-line hybrid rice were used as materials. The effects of cadmium stress( 0. 5 mmol/L) on germination percentage,germination index,vigor index,root length,bud length and fresh weight of root buds of rice seeds were studied by indoor bioassay.The results showed that cadmium stress had little effect on seed germination rate and germination index of different rice varieties,but had obvious effect on vigor index,root and bud growth,and the inhibitory effect of cadmium stress on root was significantly greater than that on bud.There were some differences in the mean values of six indexes among different types of rice varieties,but the differences were not significant.The tolerance responses of 26 varieties to cadmium stress were quite different. According to the cluster analysis of comprehensive effects of stress,they could be divided into three types: sensitive type,intermediate type and tolerant type. Among them,the sensitive rice varieties were Xiangwanxian 16,Y Liangyou 9918,C Liangyou 651 and Xin You 215,accounting for 15. 38% of the total tested varieties;the tolerant varieties were Y Liangyou 1 and Neixiang 2128,accounting for 7. 69% of the tested varieties;the other varieties fell within tolerant intermediate type,accounting for 76. 92%.

Effects of Pressure during Preparation on the Grain Orientation of Ruddlesden-Popper Structured BaLa_2Ti_3O_(10) Ceramic

As potential thermal barrier coating （TBC） materials, Ruddlesden-Popper structured BaLn2Ti3010 （Ln = rare earth） compounds possess excellent phase stability and desirable thermo-physical properties as well as interesting anisotropic structure. In this paper, the effects of pressure during BaLa2Ti3010 （BLT） bulk preparation on the grain orientation were investigated. BLT grains exhibited lamellar structure, but the grain orientation depended strongly on the existence of pressure during bulk preparation. When pressure was applied, BLT grains preferentially grew along pressing direction, leading to formation of the texture parallel to pressing direction, but BLT grain orientation became relatively random when pressure was absent. However, in the small scale area, BLT grains grew preferentially along c-axis with independence on pressure during preparation. Pressure affected BLT grain orientation at the rapid growth stage according to the grain growth model of BLT.