A pot experiment with exogenous cadmium was utilized to study the effects of waterlogging time on rice yield and Cd accumulationin different growth stages including top tillering stage and filling stage.The results sh...A pot experiment with exogenous cadmium was utilized to study the effects of waterlogging time on rice yield and Cd accumulationin different growth stages including top tillering stage and filling stage.The results showed that the rice yields of all flooding treatments were lower than the CK(CI).The WI,T1,T2,T3 and T4 decreased significantly by 23.7%,16.0%,15.5%,20.2%and 18.6%respectively.The Cd content of brown rice decreased with the extension of waterlogging time.And WF was the lowest,at only 3.4%of the wet irrigation of the whole growth period(WI).Under the same waterlogging condition,the Cd content in brown rice with 1 to 4 weeks of flooding treatment at the top tillering stage decreased by 27.1%(P﹤0.05),46.6%(P﹤0.05),56.0%(P﹤0.05)and 35.2%(P﹥0.05)respectively,compared with the treatment at the filling stage.And the average decrease was 41.2%.The variation tendency of Cd content in stems and leaves was similar to brown rice.The translocation efficiency of Cd from stems and leaves to rice seeds decreased with the extension of waterlogging time.The Cd enrichment factor of stems and leaves,as well as brown rice,varied greatly with different treatments.Specifically,the Cd enrichment factors in brown rice and in stems and leaves under WI were 28.0 and 17.8 times higher respectively than those under WF.The findings of this study demonstrated that flooding could inhibit the uptake and accumulation of Cd in rice,with significant positive correlation between them.The inhibition effect of flooding treatment on Cd accumulation in rice at the top tillering stage was superior to that at the filling stage.展开更多
Taking high nitrogen efficiency and low nitrogen tolerance C156 and C111 rice varieties as materials,the aboveground and underground biomass,total nitrogen uptake,nitrate nitrogen content and other indicators,the effe...Taking high nitrogen efficiency and low nitrogen tolerance C156 and C111 rice varieties as materials,the aboveground and underground biomass,total nitrogen uptake,nitrate nitrogen content and other indicators,the effects of methyl jasmonate(MeJA)on the growth,development and NO3^-distribution of rice under cadmium stress were studied.The results showed that under cadmium stress,more nitrate nitrogen of rice seedlings was distributed to roots,which enhanced the stress resistance of crops.The concentration of methyl jasmonate at 70μmol/L is a boundary line,and the methyl jasmonate at 70μmol/L is recommended as the later research material.Methyl jasmonate can increase the biomass and total nitrogen uptake of C156 under cadmium stress,but the effect is not significant.It can significantly improve the NUE of C111 based on biomass.展开更多
To explore the mechanism of Agaricus blazei Murrill enrichment of the heavy metal cadmium,we employed Illumina high-throughput sequencing to analyze the transcriptomes of A.blazei mycelia treated with and without exog...To explore the mechanism of Agaricus blazei Murrill enrichment of the heavy metal cadmium,we employed Illumina high-throughput sequencing to analyze the transcriptomes of A.blazei mycelia treated with and without exogenous cadmium addition,and then the differentially expressed genes(DEGs)of the strains with high and low cadmium enrichment between the control and cadmium treatment were screened out.The results showed that the DEGs were mainly involved in steroid biosynthesis,antibiotic biosynthesis,protein processing in endoplasmic reticulum,glutathione metabolism and other pathways.Carbon metabolism and glutathione metabolism may play an important role in the response of A.blazei mycelium to cadmium stress.展开更多
基金Supported by Hunan Key Research and Development Program of Agricultural Technology Innovation(2016NK2190)National Key Research&Development Project(2016YFD0800705)Specialized Scientific Research in Public Welfare Sector Water Resources Ministry(201501019)~~
文摘A pot experiment with exogenous cadmium was utilized to study the effects of waterlogging time on rice yield and Cd accumulationin different growth stages including top tillering stage and filling stage.The results showed that the rice yields of all flooding treatments were lower than the CK(CI).The WI,T1,T2,T3 and T4 decreased significantly by 23.7%,16.0%,15.5%,20.2%and 18.6%respectively.The Cd content of brown rice decreased with the extension of waterlogging time.And WF was the lowest,at only 3.4%of the wet irrigation of the whole growth period(WI).Under the same waterlogging condition,the Cd content in brown rice with 1 to 4 weeks of flooding treatment at the top tillering stage decreased by 27.1%(P﹤0.05),46.6%(P﹤0.05),56.0%(P﹤0.05)and 35.2%(P﹥0.05)respectively,compared with the treatment at the filling stage.And the average decrease was 41.2%.The variation tendency of Cd content in stems and leaves was similar to brown rice.The translocation efficiency of Cd from stems and leaves to rice seeds decreased with the extension of waterlogging time.The Cd enrichment factor of stems and leaves,as well as brown rice,varied greatly with different treatments.Specifically,the Cd enrichment factors in brown rice and in stems and leaves under WI were 28.0 and 17.8 times higher respectively than those under WF.The findings of this study demonstrated that flooding could inhibit the uptake and accumulation of Cd in rice,with significant positive correlation between them.The inhibition effect of flooding treatment on Cd accumulation in rice at the top tillering stage was superior to that at the filling stage.
文摘Taking high nitrogen efficiency and low nitrogen tolerance C156 and C111 rice varieties as materials,the aboveground and underground biomass,total nitrogen uptake,nitrate nitrogen content and other indicators,the effects of methyl jasmonate(MeJA)on the growth,development and NO3^-distribution of rice under cadmium stress were studied.The results showed that under cadmium stress,more nitrate nitrogen of rice seedlings was distributed to roots,which enhanced the stress resistance of crops.The concentration of methyl jasmonate at 70μmol/L is a boundary line,and the methyl jasmonate at 70μmol/L is recommended as the later research material.Methyl jasmonate can increase the biomass and total nitrogen uptake of C156 under cadmium stress,but the effect is not significant.It can significantly improve the NUE of C111 based on biomass.
文摘To explore the mechanism of Agaricus blazei Murrill enrichment of the heavy metal cadmium,we employed Illumina high-throughput sequencing to analyze the transcriptomes of A.blazei mycelia treated with and without exogenous cadmium addition,and then the differentially expressed genes(DEGs)of the strains with high and low cadmium enrichment between the control and cadmium treatment were screened out.The results showed that the DEGs were mainly involved in steroid biosynthesis,antibiotic biosynthesis,protein processing in endoplasmic reticulum,glutathione metabolism and other pathways.Carbon metabolism and glutathione metabolism may play an important role in the response of A.blazei mycelium to cadmium stress.
