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生长素是最重要的植物激素之一,参与了植物生长发育的各个方面。植物体内游离的IAA是生长素的主要活性形式,在IAA甲基转移酶1(IAMT1)的作用下,IAA可以转变为IAA甲酯(MelAA)。MelAA本身没有活性,在植物体内的MelAA酯解酶作用下可以重新转变为IAA。MelAA是非极性分子,能够在植物体内自由扩散。利用MelAA的这种特殊性质筛选突变体,可以分离到MelAA代谢途径或者IAA途径中新的成分。我们对拟南芥种子进行EMS诱变,通过观察黑暗下下胚轴的生长情况,筛选MelAA的抗性突变体。我们成功分离到了8株可能的抗性突变体,并对其中的一个Methyl-JAAresistant1(mir1)突变体进行了深入分析。MelAA抗性突变体的筛选将为进一步了解MelAA的代谢、IAA稳态调控和响应机理提供新的材料。 相似文献
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生长素是最重要的植物激素之一,参与了植物生长发育的各个方面。植物体内游离的IAA是生长素的主要活性形式,在IAA甲基转移酶1(IAMT1)的作用下,IAA可以转变为IAA甲酯(MelAA)。MelAA本身没有活性,在植物体内的MelAA酯解酶作用下可以重新转变为IAA。MelAA是非极性分子,能够在植物体内自由扩散。利用MelAA的这种特殊性质筛选突变体,可以分离到MelAA代谢途径或者IAA途径中新的成分。我们对拟南芥种子进行EMS诱变,通过观察黑暗下下胚轴的生长情况,筛选MelAA的抗性突变体。我们成功分离到了8株可能的抗性突变体,并对其中的一个Methyl-JAAresistant1(mir1)突变体进行了深入分析。MelAA抗性突变体的筛选将为进一步了解MelAA的代谢、IAA稳态调控和响应机理提供新的材料。 相似文献
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油菜素内酯(brassinosteroid, BRs)是一类重要的植物激素,在植物的生长发育过程中发挥重要的调节作用。BRs的信号转导研究在双子叶植物拟南芥中已取得重大进展,但在单子叶植物水稻中,BRs的信号转导途径尚不很清楚。本研究从水稻T-DNA插入突变体库中筛选出一个叶片直立突变体el(erect leave mutant)。该突变体与野生型植株相比,叶夹角减小。遗传分析显示,el的突变性状由一对显性基因控制。该基因经图位克隆定位于水稻第5染色体引物InDel3和InDel4之间,物理距离为700 kb。本研究明确了一个水稻BRs不敏感突变体的表型特征及遗传规律,为进一步研究水稻BRs信号转导调控机制奠定基础。 相似文献
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在研究光合作用相关基因的过程中,获得了一个叶片为黄心(yellow heart,yh)的突变株,与野生型拟南芥(Col 0)相比,其新生叶片发黄,突变表型由隐性单基因控制。采用图位克隆及其精细定位技术,将yh突变基因定位在1号染色体的INS1_55_342与INS1_56_34区间,物理距离约为676 kb。通过测序得知yh在At1g64790第44个内含子剪接处有4个碱基的缺失,导致内含子剪切位点的变化。RT PCR分析显示,该基因表达降低,是At1g64790基因的一个新等位突变。研究表明,yh突变体与叶绿体的发育相关,可为进一步探究植物叶绿体和叶片发育机制提供新的遗传材料。 相似文献
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通过EMS诱变、背景纯化与遗传分析,从拟南芥(Arabidopsis thaliana)中筛选到了一棵隐性单基因控制的雄性不育突变体ms1502。细胞学观察发现,突变体在小孢子从四分体释放出后花药绒毡层过早衰亡,小孢子的内容物不正常地凝聚,最终无法形成正常的花粉粒。利用图位克隆的方法对该基因MSl502进行了定位,结果表明MS1502位于第4条染色体上分子标记F25124和T12H20之间105kb区间内。目前该区间内尚未见到花药发育必需基因(不育基因)的报道,因此MS1502是一个控制花粉发育的新基因。 相似文献
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前期研究表明ABL1可能在植物叶发育过程中扮演重要的角色,其突变表现为叶片生长迟缓、成熟叶片叶缘缺刻明显等生长缺陷特征。该研究利用图位克隆及其精细定位技术,将ABL1基因锁定在2个SSLP标记T23K8和T8F5之间,该区间包含44个基因。通过生物信息学成功找到ABL1突变基因为拟南芥FAS1,该基因编码染色质组装因子CAF1的一个亚基,在植物顶端分生组织生长调控中扮演重要角色。RT-PCR结果显示,该基因表达受阻,功能互补实验证实abl1突变体的确是FAS1基因的一个新等位突变。研究结果暗示,ABL1/FAS1在植物叶形态建成中也起着重要作用。 相似文献
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经EMS诱变野生型拟南芥(Arabidopsis thaliana)群体筛选得到一株雄性不育突变体ms1142,突变体的果荚短小,不含种子。细胞学观察和扫描电镜结果表明,突变体花药发育过程中,花药中小孢子外壁异常、破裂,最后没有花粉形成。遗传分析表明,该突变体为隐性单核基因突变所致;利用图位克隆的方法将MS1142基因定位于第1条染色体的BAC克隆F16P17上44kb区间内,目前尚未见该区间内有雄性不育基因的报道。以上结果结合生物信息学分析表明,MS1142是一个新的调控花药发育的关键基因。该工作为花药发育关键基因MS1142的克隆及功能分析奠定了基础。 相似文献
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为了进一步研究花药花粉发育过程,我们通过EMS诱变,筛选到拟南芥雄性不育突变体zy1511。遗传分析表明,zy1511为隐性单位点突变。细胞学观察表明.突变体花药中小孢子从四分体释放出后绒毡层并没有开始退化,花药发育后期绒毡层依然部分存在。说明突变体花药绒毡层退化比野生型的要迟,因此,小孢子不能发育成正常花粉粒。利用图位克隆的方法将zv1511定位于第一条染色体上分子标记F25P12和T8L23之间134.kb的区间内。本项工作为zy1511基因的克隆及对花粉发育功能分析奠定了基础。目前尚未见到该区间内雄性不育基因的报道。因此,zy1511是控制花粉发育的尚未发现的关键基因。 相似文献
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It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis. 相似文献
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Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme
responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare
the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show
that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by
distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of
demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least
one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of
the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable
potent antiproliferative synthetic drugs. 相似文献
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正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases 相似文献
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Lina Rustanti Hongping Jin Dongsheng Li Mary Lor Haran Sivakumaran David Harrich 《中国病毒学》2018,33(2):142-152
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RICHARD E. NORRIS 《Botanical journal of the Linnean Society. Linnean Society of London》1991,106(1):1-40
Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera. 相似文献
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JOAN VALUÈS MONTSERRAT TORRELL NÚRIA GARCIA JACAS 《Botanical journal of the Linnean Society. Linnean Society of London》2001,137(4):399-407
Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted. 相似文献
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The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle. 相似文献