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水稻低温敏核不育系陆18S的选育及育性表现 总被引:16,自引:2,他引:14
为选育低温钝感的早籼型光温敏核不育系,从抗罗早与5690杂交后代中获得一不育株,通过自然和人工低温的增压选择,育成了水稻低温敏两用核不育系陆18S,该不育系育性转换临界温度低了23.5℃,在湖南稳定不育期达90d左右,开花习性好,异交结实率达50%,可育期自交结实率在30%以上,具有广亲和性,一般配合力强,农艺性状好,米质优、耐寒性好,中抗稻瘟病,用其选配的早晚稻组合经参加省(市)区试,应用前景看 相似文献
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H155S是湖南亚华种业科学研究院以株1s作母本,培矮64S作父本杂交选育而成的中籼型低温敏核不育系。该不育系株型理想,在湖南播始历期84d左右,不育历期6(1d左右,不育起点温度低于23℃,不育期间群体不育性稳定,花粉败育彻底,可育期间可繁性好.异交特性好,柱头外露率达80%;A上。米质优,有10项指标达到部颁二级以上优质米标准。所配组合华两优7号(湘审稻2007027)、华两优164(湘审稻2007049)和华两优285(湘审稻2007050)农艺性状优良,产量高,米质优,抗性强,适应性广,其中华两优164和华两优285米质综合评分达部颁一等食用籼稻品种品质标准.应用前景十分广阔。 相似文献
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对河南省几种主要土壤有效硫含量进行了测定,结果表明全省耕地有20%面积缺硫.田间小区试验结果表明:施硫使小麦增产3.5%~13.4%,玉米增产3.5%~11.7%,大豆增产7.1%~13.5%.在施硫量相同情况下,小麦、玉米施硫磺的增产效果大于施石膏,而大豆施石膏的增产效果则大于施硫磺.如要维持当前土壤硫素水平,每年需补充S 48~85 kg*ha-1. 相似文献
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根据所取土样测定结果,陕西省主要农业土壤中有效硫含量差异较大,变幅在2.5~199.5mg/kg之间,低于多数作物土壤有效硫临界值12mg/kg的土壤主要分布在陕北、陕南,占生态区面积的比例分别为75%和80%;关中地区S土壤所占比例仅为11.8%.缺硫土壤样品数占全省总样品数的56.6%,陕北、陕南和关中的分别占22.6%、30.2%和3.8%.关中地区使用含硫肥料较多,占全省总用硫量的82.2%,陕北、陕南分别为6.5%和11.4%.硫肥在陕南春玉米上有明显的增产效果,三块试验的增产率分别为16.5%、25.9%、16.2%,平均为19.5%. 相似文献
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[目的]通过拼接完成对SARS S蛋白的上下游序列S1和S2的合成,并在大肠杆菌中表达,获得具活性的S1和S2蛋白。[方法]利用不对称PCR方法以及采用设计酶切位点将2个片段连接的方法合成SARS香港株S蛋白上下游2个片段S1和S2;构建S1和S2这2个基因片段的原核表达载体,pET28a-S1和pET28a-S2,并转化BL21表达菌株,然后用IPTG诱导目的基因的表达并提取纯化目的蛋白。[结果]连接得到S1和S2这2个基因片段,并成功地在大肠杆菌中得到表达。[结论]该研究为后续SARS疫苗研究提供检测抗原奠定了基础。 相似文献
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The physical location of 45S and 5S rDNA sites by double-target fluorescence in situ hybridization (FISH) and 5S rDNA non-transcribed spacer (NTS) sequences was studied in five accessions of Nelumbo nucifera Gaertn. and one accession of N. nucifera subsp. lutea (Willd.). The chromosome number of all tested materials was 2n=16. The loci ofSS rDNA were close to the centromere regions of chromosome 3, and the loci of 45S rDNA were found on chromosomes 7 and 8 in all the six tested accessions, respectively. Similarly, 45S rDNAs were also located on chromosome 4 in four tested aocessions.The 5S rRNA gene sequences were conserved and the NTS sequences were variable among the samples. N. nucifera subsp. Iutea was the longest branch in the phylogenetic tree and clustered with N. nucifera cv. Liangzihu. N. nucifera cv.Heilongjiang and N. nucifera cv. Weishanhu showed a close relationship with each other. N. nucifera cv. Dahe Lian was closer to N. nucifera cv. Nihelu Lian than to other tested accessions. Analysis of the molecular karyotype and the 5S rRNA gene spacer sequence suggested the genetic diversity was limited within Nelumbo species and it seems suitable that American lotus was considered as the subspecies of N. nucifera. 相似文献
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《Science (New York, N.Y.)》1947,105(2723):253-254
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Synthesis of 5S and 4S RNA in metaphase-arrested HeLa cells 总被引:7,自引:0,他引:7
The continued synthesis of both 5S and 4S RNA in metaphase-arrested HeLa cells is demonstrated; 5S RNA is apparently synthesized at approximately 74 percent of the interphase rate, while 4S RNA is synthesized at approximately one-third the rate. The ratio of uridine incorporation to RNA methylation is used to correct for the alteration in the specific activity of the pyrimidine pool during metaphase arrest. 相似文献
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Complement fixation on cell surfaces by 19S and 7S antibodies 总被引:32,自引:0,他引:32
The mechanism of complement fixation on cell surfaces by whole antiserums, and by 19S and 7S fractions has been studied with a new comple-ment-fixation test. This test is based on the fixation and transfer of the activated first component of complement (C1a). We have concluded that a single molecule of 19S antibody in combination with antigen at the cell surface is sufficient to bind one molecule of C1a. For 7S antibodies at least two molecules in close proximity at the cell surface are required to fix one molecule of C1a. 相似文献
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贵州省耕地土壤硫素状况及硫肥效果研究 总被引:1,自引:0,他引:1
硫是作物生长的重要营养元素之一.1991~1992年开展的土壤硫素肥力调查,已明确指出贵州省耕地土壤全硫、有效硫的含量情况.在不同类型土壤上布置21个田间试验,研究了硫肥对水稻、玉米、小麦、油菜的效果.调查结果表明,贵州土壤平均有效硫与全硫量分别为55 mg*kg-1与419 mg*kg-1,比南方其他各省都高.在21个田间试验中有15个试验施用硫肥作物增产达5%以上.工业副产品磷石膏作为硫源比普钙、石膏、硫酸钾及硫磺粉好.田间试验证明当土壤有效硫含量低于30 mg*kg-1时有较好施硫效果,在贵州有效硫含量30 μg*kg-1或许作为缺硫或潜在性缺硫指标,在贵州大约有1/3土壤低于该值.为了作物高产稳产需求,在贵州缺硫或潜在性缺硫土壤上硫的施用量建议为31.5~60 kg*ha-1. 相似文献
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