Heading date is a key trait in rice domestication and adaption, and a number of quantitative trait loci（QTLs）have been identified. The rice（Oryza sativa L.） cultivars in the Heilongjiang Province, the northernmost...Heading date is a key trait in rice domestication and adaption, and a number of quantitative trait loci（QTLs）have been identified. The rice（Oryza sativa L.） cultivars in the Heilongjiang Province, the northernmost region of China,have to flower extremely early to fulfill their life cycle.However, the critical genes or different gene combinations controlling early flowering in this region have not been determined. QTL and candidate gene analysis revealed that Hd2/Ghd7.1/Os PRR37 plays a major role in controlling rice distribution in Heilongjiang. Further association analysis with a collection of rice cultivars demonstrated that another three major QTL genes（Hd4/Ghd7, Hd5/DTH8/Ghd8, and Hd1）also participate in regulating heading date under natural long day（LD） conditions. Hd2/Ghd7.1/Os PRR37 and Hd4/Ghd7 are two major QTLs and function additively. With the northward rice cultivation, the Hd2/Ghd7.1/Os PRR37 and Hd4/Ghd7 haplotypes became non-functional alleles. Hd1 might be non-functional in most Heilongjiang rice varieties,implying that recessive hd1 were selected during local rice breeding. Non-functional Hd5/DTH8/Ghd8 is very rare, but constitutes a potential target for breeding extremely early flowering cultivars. Our results indicated that diverse genetic combinations of Hd1, Hd2, Hd4, and Hd5 determined the different distribution of rice varieties in this northernmost province of China.展开更多
To investigate the effects of 4-methyl-2-{[4-(toluene-4-sulfonyl)-thiomorpholine-3-carbonyl]-amino}-pentanoic acid isopropyl ester(HD5-6)against cerebral ischemia in rodents,the models with global and focal ischemia w...To investigate the effects of 4-methyl-2-{[4-(toluene-4-sulfonyl)-thiomorpholine-3-carbonyl]-amino}-pentanoic acid isopropyl ester(HD5-6)against cerebral ischemia in rodents,the models with global and focal ischemia were induced by bilateral common carotid artery occlusion plus hypotension(BCAOH)and permanent cerebral artery occlusion(p-MCAO)in mice(n=10–12 per group in BCAOH;n=8 per group in p-MCAO)and rats(n=10-11 in each group).HD5-6 prolonged lifetime and improved neurological function.Neurological deficits score in HD5-6(30 mg/kg)decreased significantly.Malonaldehyde(MDA)in HD5-6-treated mice with ischemia considerably dropped.The infarction volume of the HD5-6-treated rats with MCAO-induced ischemia decreased significantly in the high dose group(P<0.05,i.g.and P<0.01,i.v.).Immunohistochemistry showed that Brain derived neurotrophic factor(BDNF)in the ipsilateral hemisphere increased and Vascular endothelial growth factor(VEGF)decreased with HD5-6 treatment.HD5-6 has protective effects against experimental cerebral ischemia in rodents and the action mechanism may involve anti-oxidation and neurogenesis.展开更多
基金supported by the Hundred-Talent Program of the Chinese Academy of SciencesNational Natural Science Foundation of China(31070255,31371588)+1 种基金Excellent Academic Leaders of Harbin(RC2014XK002003)the High Tech Program of Ministry of Science and Technology of China(2014AA10A602-5)
文摘Heading date is a key trait in rice domestication and adaption, and a number of quantitative trait loci（QTLs）have been identified. The rice（Oryza sativa L.） cultivars in the Heilongjiang Province, the northernmost region of China,have to flower extremely early to fulfill their life cycle.However, the critical genes or different gene combinations controlling early flowering in this region have not been determined. QTL and candidate gene analysis revealed that Hd2/Ghd7.1/Os PRR37 plays a major role in controlling rice distribution in Heilongjiang. Further association analysis with a collection of rice cultivars demonstrated that another three major QTL genes（Hd4/Ghd7, Hd5/DTH8/Ghd8, and Hd1）also participate in regulating heading date under natural long day（LD） conditions. Hd2/Ghd7.1/Os PRR37 and Hd4/Ghd7 are two major QTLs and function additively. With the northward rice cultivation, the Hd2/Ghd7.1/Os PRR37 and Hd4/Ghd7 haplotypes became non-functional alleles. Hd1 might be non-functional in most Heilongjiang rice varieties,implying that recessive hd1 were selected during local rice breeding. Non-functional Hd5/DTH8/Ghd8 is very rare, but constitutes a potential target for breeding extremely early flowering cultivars. Our results indicated that diverse genetic combinations of Hd1, Hd2, Hd4, and Hd5 determined the different distribution of rice varieties in this northernmost province of China.
基金This work is supported by a grant from the national science and technology major project,a candidate drug for neurodegenerative diseases targeting FKBPs,(2009ZX09103-024).
文摘To investigate the effects of 4-methyl-2-{[4-(toluene-4-sulfonyl)-thiomorpholine-3-carbonyl]-amino}-pentanoic acid isopropyl ester(HD5-6)against cerebral ischemia in rodents,the models with global and focal ischemia were induced by bilateral common carotid artery occlusion plus hypotension(BCAOH)and permanent cerebral artery occlusion(p-MCAO)in mice(n=10–12 per group in BCAOH;n=8 per group in p-MCAO)and rats(n=10-11 in each group).HD5-6 prolonged lifetime and improved neurological function.Neurological deficits score in HD5-6(30 mg/kg)decreased significantly.Malonaldehyde(MDA)in HD5-6-treated mice with ischemia considerably dropped.The infarction volume of the HD5-6-treated rats with MCAO-induced ischemia decreased significantly in the high dose group(P<0.05,i.g.and P<0.01,i.v.).Immunohistochemistry showed that Brain derived neurotrophic factor(BDNF)in the ipsilateral hemisphere increased and Vascular endothelial growth factor(VEGF)decreased with HD5-6 treatment.HD5-6 has protective effects against experimental cerebral ischemia in rodents and the action mechanism may involve anti-oxidation and neurogenesis.
