...
首页> 外文期刊>Journal of Plant Research >Disruption of the psbA gene by the copy correction mechanism reveals that the expression of plastid-encoded genes is regulated by photosynthesis activity
【24h】

Disruption of the psbA gene by the copy correction mechanism reveals that the expression of plastid-encoded genes is regulated by photosynthesis activity

机译:通过复制校正机制破坏psbA基因表明,质体编码基因的表达受光合作用的调节

获取原文
获取原文并翻译 | 示例
           

摘要

The functional analysis of genes encoded by the chloroplast genome of tobacco by reverse genetics is routine. Nevertheless, for a small number of genes their deletion generates heteroplasmic genotypes, complicating their analysis. There is thus the need for additional strategies to develop deletion mutants for these genes. We have developed a homologous copy correction-based strategy for deleting/mutating genes encoded on the chloroplast genome. This system was used to produce psbA knockouts. The resulting plants are homoplasmic and lack photosystem II (PSII) activity. Further, the deletion mutants exhibit a distinct phenotype; young leaves are green, whereas older leaves are bleached, irrespective of light conditions. This suggests that senescence is promoted by the absence of psbA. Analysis of the transcript levels indicates that NEP (nuclear-encoded plastid RNA polymerase)-dependent plastid genes are up regulated in the psbA deletion mutants, whereas the bleached leaves retain plastid-encoded plastid RNA polymerase activity. Hence, the expression of NEP-dependent plastid genes may be regulated by photosynthesis, either directly or indirectly.
机译:通过反向遗传学对烟草叶绿体基因组编码的基因进行功能分析是常规的。然而,对于少数基因,它们的缺失会产生异质基因型,从而使分析变得复杂。因此,需要其他策略来开发这些基因的缺失突变体。我们已经开发出基于同源拷贝校正的策略,用于删除/突变叶绿体基因组上编码的基因。该系统用于产生psbA敲除。所得植物是同质的,并且缺乏光系统II(PSII)活性。此外,缺失突变体表现出独特的表型。不论光照条件如何,幼叶都是绿色的,而老叶则是漂白的。这表明不存在psbA可促进衰老。转录水平的分析表明,在psbA缺失突变体中,NEP(核编码的质体RNA聚合酶)依赖性质体基因被上调,而漂白的叶保留了质体编码的质体RNA聚合酶活性。因此,NEP依赖性质体基因的表达可以通过光合作用直接或间接调节。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号