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籼稻巨胚不育系98-14geA的选育与研究 总被引:4,自引:0,他引:4
通过Co^60-γ射线照射籼稻保持系98-14B种子,获得其巨胚隐性单基因突变体98-14geB.98-14geB与98-14B主要农艺性状无显著差异,但绝对胚重和相对胚重分别由0.57mg和2.69%提高到1.17mg和6.33%.98-14geB糙米的蛋白质、粗脂肪、粗纤维、各种矿物质及氨基酸含量比98-14B显著提高.蛋白质含量11.87%,比98-14B提高了22.46%;粗脂肪含量5.25%,提高了58.13%;17种氨基酸含量均提高了,提高幅度为10.05%~34.85%;98-14geB的矿物质元素含量也普遍高于98-14B.与98-14B相比,98-14geB千粒重及生产力有所下降.用98-14geB回交98-14A育成巨胚不育系98-14geA.98-14geA与98-14A的主要农艺性状、雄性不育性特征及构成产量配合力均无明显差异.利用巨胚恢复系与98-14geA组配成巨胚杂交稻,还就巨胚稻的育种技术作了讨论. 相似文献
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结合结构化学的特点,在教学中应用Gaussian98和Gaussview这类计算化学软件,使抽象的内容形象化,微观成为宏观,教学过程变得简单、清晰,更有利于教与学。 相似文献
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M. Mazza B. Iulini G. Vaccari P.L. Acutis F. Martucci E. Esposito S. Peletto S. Barocci B. Chiappini C. Corona I. Barbieri M. Caramelli U. Agrimi C. Casalone R. Nonno 《Research in veterinary science》2010,88(3):478-485
Nor98 is an atypical scrapie strain characterized by a molecular pattern and brain distribution of the pathological prion protein (PrPSc) different from classical scrapie. In Italy, 69 atypical cases have been identified so far and all were characterized as Nor98 strain. In this paper we report an unusual case in a sheep which showed immunohistochemical and molecular features of PrPSc different from the other atypical cases. The sheep was from an outbreak where the index and the other four cases were affected by classical scrapie. Histopathological, immunohistochemical and Western blot analyses on the brain of the unusual case revealed the simultaneous presence of pathological features characteristic of Nor98 and classical scrapie. Interestingly, the prevalent disease phenotype in the brainstem was classical scrapie-like, while in the cerebral cortex and cerebellum the Nor98 phenotype was dominant. The sub-mandibular lymph node was positive and showed a PrPSc molecular pattern referable to classical scrapie. The PrP genotype was AL141RQ/AF141RQ. Taken together, the occurrence of classical scrapie in the outbreak, the PrP genotype, the involvement of different cellular targets in the brain and the pathological and molecular PrPSc features observed suggest that this unusual case may result from the co-existence of Nor98 and classical scrapie. 相似文献
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为获得灰葡萄孢的致病相关基因并研究其基因功能,筛选灰葡萄孢的T-DNA插入突变体库,获得了一株致病力增强的突变体BCt98。利用PCR和Southern Blotting技术,对突变体BCt98进行鉴定。利用TAIL-PCR技术结合生物信息学方法,确定了突变体BCt98中T-DNA插入位点位于BC1G_07014.1基因的第3个外显子上。利用RT-PCR技术,确定了突变体BCt98的突变基因为BC1G_07014.1。突变体BCt98生长速度较快,菌落颜色较浅,菌丝较为致密,不产生分生孢子和菌核,且胞壁降解酶(PMG、PG和Cx)及毒素活性较野生型明显增强。表明BC1G_07014.1基因在灰葡萄孢生长、发育和致病力调控方面发挥重要作用,且参与调控病菌的胞壁降解酶活性和毒素活性。 相似文献
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为保证制苗所用毒种质量和稳定性,在对制苗毒种病毒含量、病毒纯净性、特异性、免疫原性及扩繁代次等研究的基础上,建立了鹅细小病毒灭活疫苗毒种种子批。试验使用鹅胚对鹅细小病毒YA98株进行了20次传代。传代毒种的鉴定结果表明:抽检的各代次的毒种均无细菌、支原体、外源病毒污染,且病毒含量检测稳定,每0.3 m L含104.78~4.85ELD50;各代次特异性检测均能被鹅细小病毒抗血清中和;将各代次病毒液制成灭活疫苗,免疫成鹅后均能产生完全保护。以此为依据,最终确定原始毒种和基础毒种的扩繁代次宜控制在5代以内,生产毒种的最高扩繁代次宜控制在15代以内。种子批的建立,为鹅细小病毒灭活疫苗的生产奠定了基础。 相似文献