The high quality rice,Xiang 5,is a new strain bred by Institute of Food Crops of Hubei Academy of Agricultural Sciences which first hybridizes Chinese scented rice with 9311,and then re-crosses it with Ezhong 5 for co...The high quality rice,Xiang 5,is a new strain bred by Institute of Food Crops of Hubei Academy of Agricultural Sciences which first hybridizes Chinese scented rice with 9311,and then re-crosses it with Ezhong 5 for continuous generations. The strain has good quality,high yield,suitable maturity period,strong scent,strong combining ability and other features. This paper summarizes the appearance characteristics of Xiang 5 and main points of the supporting cultivation techniques,aimed at providing technical support and theoretical reference for its field production.展开更多
Extreme hot weather severely limits rice(Oryza sativa)production.Rice cultivars from regions with hot weather are a valuable resource for breeding heat-tolerant rice,but the mechanisms mediating heat tolerance in thes...Extreme hot weather severely limits rice(Oryza sativa)production.Rice cultivars from regions with hot weather are a valuable resource for breeding heat-tolerant rice,but the mechanisms mediating heat tolerance in these cultivars are not fully understood.Here,we investigated heat-tolerance mechanisms in rice using the well-known heat-tolerant cultivar Nagina 22(N22)and comparing it with the less heat-tolerant cultivar 93–11.Following heat shock(HS)treatment(45℃ for 3 or 24 h),the expression of JASMONATE ZIM-DOMAIN(JAZ)genes spiked during the early stages of HS responses in N22 but not 93–11 and genes related to jasmonic acid(JA)signaling were repressed in N22.Promoting JA signaling in N22 via pretreatment with methyl JA(MeJA)impaired the heat tolerance of N22,measured as survival after HS treatment of 45℃ for 30 h,followed by a 7-d recovery.Furthermore,the N22-specific activation of JAZ genes was associated with increased histone acetylation and decreased DNA methylation.Comparing N22 to 93–11,we propose that the DNA demethylation process,rather than the hypomethylation status per se,is likely associated with JAZ activation.In summary,we revealed epigenetic mechanisms that may contribute to the heat tolerance of N22 via the JA signaling pathway;our findings have implications for improving heat tolerance in rice and other crops.展开更多
基金Supported by 973 Program(2013CBA01405)863 Program(2014AA10-A604)+1 种基金Wuhan Experiment Station Project of National Rice Industrial Technology System(CARS-01-63)Youth Science Foundation of Hubei Academy of Agricultural Sciences(2015NKYJJ01)
文摘The high quality rice,Xiang 5,is a new strain bred by Institute of Food Crops of Hubei Academy of Agricultural Sciences which first hybridizes Chinese scented rice with 9311,and then re-crosses it with Ezhong 5 for continuous generations. The strain has good quality,high yield,suitable maturity period,strong scent,strong combining ability and other features. This paper summarizes the appearance characteristics of Xiang 5 and main points of the supporting cultivation techniques,aimed at providing technical support and theoretical reference for its field production.
文摘Extreme hot weather severely limits rice(Oryza sativa)production.Rice cultivars from regions with hot weather are a valuable resource for breeding heat-tolerant rice,but the mechanisms mediating heat tolerance in these cultivars are not fully understood.Here,we investigated heat-tolerance mechanisms in rice using the well-known heat-tolerant cultivar Nagina 22(N22)and comparing it with the less heat-tolerant cultivar 93–11.Following heat shock(HS)treatment(45℃ for 3 or 24 h),the expression of JASMONATE ZIM-DOMAIN(JAZ)genes spiked during the early stages of HS responses in N22 but not 93–11 and genes related to jasmonic acid(JA)signaling were repressed in N22.Promoting JA signaling in N22 via pretreatment with methyl JA(MeJA)impaired the heat tolerance of N22,measured as survival after HS treatment of 45℃ for 30 h,followed by a 7-d recovery.Furthermore,the N22-specific activation of JAZ genes was associated with increased histone acetylation and decreased DNA methylation.Comparing N22 to 93–11,we propose that the DNA demethylation process,rather than the hypomethylation status per se,is likely associated with JAZ activation.In summary,we revealed epigenetic mechanisms that may contribute to the heat tolerance of N22 via the JA signaling pathway;our findings have implications for improving heat tolerance in rice and other crops.
