在叶绿体发育的早期阶段，编码质体核糖体蛋白的核基因的表达先于叶绿体基因的表达。
The expression of nuclear genes encoding plastid ribosomal proteins precedes the expression of chloroplast genes during early phases of chloroplast development.
作者信息
Harrak H, Lagrange T, Bisanz-Seyer C, Lerbs-Mache S, Mache R
机构信息
Laboratoire de Biologie Moléculaire Végétale, Université J. Fourier, Grenoble, France.
出版信息
Plant Physiol. 1995 Jun;108(2):685-92. doi: 10.1104/pp.108.2.685.
Abstract
The development of different plant organs (root, hypocotyl, and cotyledons) during seed germination is connected with the transformation of proplastids, which are found in embryonic and meristematic tissues, into amyloplasts in root tissues and into chloroplasts in cotyledons. We have analyzed the expression of nuclear and plastid genes coding for the plastid translational apparatus during the first 7 d of Spinacia oleracea development. Results show that the nuclear genes (rps1, rps22, rpI21, and rpI40) are expressed from the 1st d of seed imbibition and precede transcription of the chloroplast-encoded genes (photosynthetic and nonphotosynthetic), which starts the 3rd d after the beginning of imbibition. Transcription from the leaf-/cotyledon-specific P1 promoter of the rpI21 gene starts on the first imbibition day. Inhibition of chloroplast biogenesis by bleaching in the presence of norflurazon has no influence on the expression from this P1 promoter, suggesting that the onset of transcription of nuclear gene rpI21 is independent of a plastid signal.
摘要
种子萌发过程中不同植物器官（根、下胚轴和子叶）的发育与质体前体的转变有关，质体前体存在于胚胎和分生组织中，在根组织中转变为造粉体，在子叶中转变为叶绿体。我们分析了菠菜发育前7天期间编码质体翻译装置的核基因和质体基因的表达。结果表明，核基因（rps1、rps22、rpI21和rpI40）从种子吸胀第1天开始表达，先于叶绿体编码基因（光合和非光合基因）的转录，后者在吸胀开始后第3天开始。rpI21基因叶/子叶特异性P1启动子的转录在吸胀第一天开始。在去甲氟草酮存在下通过漂白抑制叶绿体生物发生对该P1启动子的表达没有影响，这表明核基因rpI21转录的起始独立于质体信号。
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