996 resultados para 340-U1399B


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植物血红蛋白在共生固氮根瘤中主要是对固氮酶进行嫌氧保护,确保固氮酶活性,在植物根中协助氧的运输或作为感觉氧压的信号分子.豆科植物凝集素功能之一是对相应专一的根瘤菌有识别作用,并有利于根瘤菌的聚集和侵染。本论文将非豆科结瘤植物Parasponia andersonii血红蛋白基因及豌豆凝集索基因转入水稻,目的是此二基因表达后,豌豆凝集素可聚集、识别豌豆根瘤菌,并有助于它们的侵染,血红蛋白则可对根瘤菌固氮酶进行嫌氧保护,保障其发挥固氮作用,从而为实现水稻结瘤和固氮打下初步基础。 本论文将带有Parasponia血红蛋白基因的pL305质粒,带有潮霉素磷酸转移酶基因及Parasponia血红蛋白基因的农杆菌双元载体质粒pLX412-Hb用花粉管通道法转化水稻l用pLX412-Hb和带有Bar基因、豌豆凝集素基因、Parasponia血红蛋白基因的质粒pLHB用基因枪法转化水稻幼胚及愈伤组织,带有pLX412-Hb的Agrobactmum tumefaciens LBA4404转化烟草,得到如下结果: 1.用pL305质粒花粉管通道法转化水稻,运作1512朵花,得到707粒种子.将230粒种子萌发,发芽220粒;白化苗4株,成苗206株;计发芽率96%,白化苗率1.7%,成苗率90%。取120株提取DNA以Parasponia血红蛋白基因为探针进行点杂交,有6株为阳性结果,阳性率5%.再取4株DNA点杂交阳性植株DNA,以Parasponia血红蛋白基因为探针进行Southem杂交,有3株有阳性结果,阳性率为75%,照此推算转化植株约占总植株的4%.目前,这些转基因植株已开花结实。 2.用pLX412-Hb质粒花粉管通道法转化水稻,运作743朵花,得到340粒种子。将120粒种子萌发,发芽117粒,白化苗3株,成苗111株;计发芽率97. 5%,白化苗率2. 5%,成苗率92. 5%.取30株提取DNA以Parasponia血红蛋白基因为探针进行点杂交,有4株为阳性结果,阳性率13%。再取4株DNA点杂交呈阳性的植株DNA,以Parasponia血红蛋白基因为探针进行Southern杂交,有2株有阳性结果,阳性率为50%,照此推算转化植株约占总植株的7%。目前部分转基因植株巳开花结实. 3.用pLX412 - Hb质粒基因枪法转化水稻幼胚及愈伤组织,抗性筛选得到15株再生植株,以Parasponia血红蛋白基因为探针进行点杂交,有14株为阳性结果,阳性率93%.取7株DNA点杂交呈阳性的植株DNA,以Parasponia血红蛋白基因为探针进行Southern杂交,都为阳性结果,阳性率为100%,照此推算转化植株约占总植株的93%.目前,部分转基因植株已开花结实. 4.用pLX412 -Hb质粒通过Agrobacterrum tumeFaciens LBA4404转化烟草,抗性筛选得到的再生植株以Parasponia血红蛋白基因为探针进行Southern杂交,结果为阳性. 5.用pLHB基因枪法转化的愈伤组织,抗性筛选得到已分化出绿芽点的愈伤组织,以Parasponia血红蛋白基因为探针或以豌豆凝集素基因为探针进行Southern杂交,杂交结果均为阳性. 6.最近国外巳发现大麦有血红蛋白基因.本论文以大麦血红蛋白cDNA为探针对未转基因的水稻进行Southern杂交,结果有阳性带。说明水稻有与大麦血红蛋白基因高度同源序列。以Parasponia血红蛋白基因为探针时杂交结果为阴性,说明水稻血红蛋白基因与Parasponiaa血红蛋白基因核苷酸序列相差较大. 7.提取Southern杂交证明有Parasponia血红蛋白基因整合的水稻根及叶总RNA,以Parasponia血红蛋白基因cDNA为探针进行RNA点杂交,结果根总RNA为阳性,叶总RNA为阴性。初步证明Parasponia血红蛋白基因在水稻根中表达。 8.提取未转基因的水稻根及叶RNA,以大麦血红蛋白基因cDNA为探针进行RNA点杂交,结果:根总RNA为阳性结果,叶总RNA为阴性结果.初步证明水稻血红蛋白基因在水稻根中表达。 总之,本论文证明已将Parasponia血红蛋白基因整合进水稻植株染色体,将豌豆凝集素基因、Parasponia血红蛋白基因整合进水稻愈伤组织染色体,初步证明水稻有血红蛋白基因,内外源血红蛋白基因都有组织特异性表达,从而为本研究的战略设想奠定初步基础。

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From its origins in the US electronics sector in the 1970s, technology roadmapping has been adapted (and adopted) widely, for many different innovation, strategy and policy applications. Communication is commonly cited as one of the key benefi ts of roadmapping, particularly in terms of the process that brings different organizational perspectives together, with the roadmap providing a common visual 'language'. There is signifi cant demand for methods that are agile, in the sense of being rapid, flexible and effective to apply, focused on strategic decisions and actions. 'Fast-start' roadmapping workshop techniques enable key stakeholders to address strategic issues efficiently using the visual structure of roadmaps to capture, discuss, prioritize, explore and communicate. This paper presents the learning from a set of five diverse applications of the fast-start approach in the Basque Country, which demonstrate the agility of the technique.