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Molecular genetic studies of senescence in anthurium.

机译:红掌衰老的分子遗传学研究。

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摘要

Senescence is a complex physiological process and has become an attractive area of research in plant molecular biology. The autoregulated production of cytokinin in plants transformed with the PrSAG12-IPT gene construct significantly delayed leaf senescence, and created plants that lived longer, produced more flowers with improved vase life, and an overall increased productivity. The promoter region of an arabidopsis cysteine protease served as the senescence-activated switch for the cytokinin gene IPT, and the discovery of a homolog in anthurium (ANTH17) made possible the cloning and isolation of its promoter. The sequence contained motifs and cis-elements characteristic of senescence response, and transformation of arabidopsis with PrANTH17-IPT showed similar traits with those transformed with PrSAG12-IPT. Agrobacterium-mediated transformation of anthurium with the senescence-activated gene constructs proved challenging, and stable transformation of plants was confirmed by screening for the reporter gene GFP using molecular methods. An effort to establish a protoplast transient expression system in anthurium was initiated in order to study protein subcellular signaling and localization, and is still in the process of optimization. Transcriptomic analysis of senescing leaf and spathe identified proteins involved in tissue-specific development, and provided an enormous collection of over 17,000 gene sequences that are differentially expressed. An examination of the major anthurium seed development proteins provided initial results in understanding the connection between senescence and embryo development, two very similar molecular processes in plants.
机译:衰老是一个复杂的生理过程,已成为植物分子生物学研究的一个有吸引力的领域。用PrSAG12-IPT基因构建体转化的植物中细胞分裂素的自动调节显着延迟了叶片的衰老,并创造了寿命更长的植物,产生了更多的花,并延长了花瓶的寿命,并总体上提高了生产力。拟南芥半胱氨酸蛋白酶的启动子区域是细胞分裂素基因IPT的衰老激活开关,红掌中同源物(ANTH17)的发现使得克隆和分离其启动子成为可能。该序列包含衰老应答特征的基序和顺式元件,用PrANTH17-IPT转化拟南芥显示出与用PrSAG12-IPT转化的拟南芥相似的性状。农杆菌介导的具有衰老活化基因构建体的红掌转化被证明具有挑战性,并且通过使用分子方法筛选报告基因GFP来证实植物的稳定转化。为了研究蛋白质亚细胞信号传导和定位,开始了在红掌中建立原生质体瞬时表达系统的努力,并且仍在优化过程中。衰老的叶片和叶片的转录组学分析确定了参与组织特异性发育的蛋白质,并提供了超过17,000个差异表达基因序列的巨大集合。对主要红掌种子发育蛋白的检查为了解衰老与胚胎发育之间的联系提供了初步结果,而衰老与胚胎发育是植物中两个非常相似的分子过程。

著录项

  • 作者

    Perez, Pierriden Azucena.;

  • 作者单位

    University of Hawai'i at Manoa.;

  • 授予单位 University of Hawai'i at Manoa.;
  • 学科 Biology Molecular.;Biology Plant Physiology.;Biology Genetics.;Biology Botany.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 168 p.
  • 总页数 168
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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