Super absorbent resin(SAR)is prepared by aqueous high temperature polymerization using hydroxypropyl methylcellulose(HPMC)as monomer backbone material,acrylic acid(AA)and acrylamide(AM)as the graft copolymer monomer,p...Super absorbent resin(SAR)is prepared by aqueous high temperature polymerization using hydroxypropyl methylcellulose(HPMC)as monomer backbone material,acrylic acid(AA)and acrylamide(AM)as the graft copolymer monomer,potassium persulfate(KPS)as the initiator to generate free radicals,and N,N`-methylenebisacrylamide(MBA)as cross-linking agent for cross-linking reaction.Simutaneously,the influence of individual factors on the water absorption is investigated,and these factors are mainly AA,AM,KPS,MBA,HPMC,and reaction temperature.The optimized conditions are obtained by the experiment repeating for several times.The water absorption multiplicity and salt absorption multiplicity under the conditions are 782.4 and 132.5 g/g,respectivity.Furthermore,the effects of different temperatures and salt concentrations on its water absorption,as well as the swelling kinetics of SAR are studied.It is indicated the water-absorbing swelling process is mainly caused by the difference in water osmotic pressure and Na+concentration inside and outside the cross-linked molecular structure of the resin,which is not only consistent with the quasi-secondary kinetic model,but also with the Fick diffusion model.展开更多
【目的】株型是影响棉花机械化和产量的关键因素,开展陆地棉主要株型性状的关联分析研究,可为棉花株型分子育种提供标记及材料来源。【方法】以403份陆地棉种质资源为材料,利用覆盖全基因组的201对多态性SSR标记,对6个环境4个株型性状...【目的】株型是影响棉花机械化和产量的关键因素,开展陆地棉主要株型性状的关联分析研究,可为棉花株型分子育种提供标记及材料来源。【方法】以403份陆地棉种质资源为材料,利用覆盖全基因组的201对多态性SSR标记,对6个环境4个株型性状进行了关联分析,挖掘株型性状优异等位基因。【结果】6个环境中株高、果枝始节高、果枝始节位和果枝数的平均变异系数分别为13.70%、21.51%、14.18%和11.51%,广义遗传率为46.24%-74.15%;201对标记共产生394个多态性等位变异位点;能同时在最佳线性无偏预测值(best linear unbiased prediction, BLUP)(P<0.01)和2个以上环境中检测到显著(P<0.05)关联的位点共38个,包括与株高关联的位点16个、与果枝始节高关联的位点6个、与果枝始节位关联的位点11个、与果枝数关联的位点5个,5个位点同时与多个性状关联;鉴定到含有目标性状优异等位基因的材料31份,其中6份材料同时携带多个优异等位基因。【结论】在403份陆地棉自然群体中,鉴定到38个与4个株型性状关联的标记位点,发掘出31份含有优异等位基因的典型材料。展开更多
基金Funded by National Natural Science Foundation of China(No.52174206)Shaanxi Provincial Department of Education Youth Innovation Team Construction Scientific Research Plan Project(No.21JP074)Shaanxi Provincial Department of Education Youth Innovation Team Scientific Research Plan Project(No.22JP047)。
文摘Super absorbent resin(SAR)is prepared by aqueous high temperature polymerization using hydroxypropyl methylcellulose(HPMC)as monomer backbone material,acrylic acid(AA)and acrylamide(AM)as the graft copolymer monomer,potassium persulfate(KPS)as the initiator to generate free radicals,and N,N`-methylenebisacrylamide(MBA)as cross-linking agent for cross-linking reaction.Simutaneously,the influence of individual factors on the water absorption is investigated,and these factors are mainly AA,AM,KPS,MBA,HPMC,and reaction temperature.The optimized conditions are obtained by the experiment repeating for several times.The water absorption multiplicity and salt absorption multiplicity under the conditions are 782.4 and 132.5 g/g,respectivity.Furthermore,the effects of different temperatures and salt concentrations on its water absorption,as well as the swelling kinetics of SAR are studied.It is indicated the water-absorbing swelling process is mainly caused by the difference in water osmotic pressure and Na+concentration inside and outside the cross-linked molecular structure of the resin,which is not only consistent with the quasi-secondary kinetic model,but also with the Fick diffusion model.
文摘【目的】株型是影响棉花机械化和产量的关键因素,开展陆地棉主要株型性状的关联分析研究,可为棉花株型分子育种提供标记及材料来源。【方法】以403份陆地棉种质资源为材料,利用覆盖全基因组的201对多态性SSR标记,对6个环境4个株型性状进行了关联分析,挖掘株型性状优异等位基因。【结果】6个环境中株高、果枝始节高、果枝始节位和果枝数的平均变异系数分别为13.70%、21.51%、14.18%和11.51%,广义遗传率为46.24%-74.15%;201对标记共产生394个多态性等位变异位点;能同时在最佳线性无偏预测值(best linear unbiased prediction, BLUP)(P<0.01)和2个以上环境中检测到显著(P<0.05)关联的位点共38个,包括与株高关联的位点16个、与果枝始节高关联的位点6个、与果枝始节位关联的位点11个、与果枝数关联的位点5个,5个位点同时与多个性状关联;鉴定到含有目标性状优异等位基因的材料31份,其中6份材料同时携带多个优异等位基因。【结论】在403份陆地棉自然群体中,鉴定到38个与4个株型性状关联的标记位点,发掘出31份含有优异等位基因的典型材料。
