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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Evidence of ceased programmed cell death in metaphloem sieve elements in the developing caryopsis of Triticum aestivum L.
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Evidence of ceased programmed cell death in metaphloem sieve elements in the developing caryopsis of Triticum aestivum L.

机译：普通小麦发育中的颖果颖皮中筛子元素中程序性细胞死亡的停止证据。

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摘要

Transmission electron microscopy (TEM) and fluorescence microscopy studies revealed that the metaphloem sieve elements (MSEs) in the ventral vascular bundle of the caryopses of developing wheat (Triticum aestivum L.) undergo a unique type of programmed cell death (PCD). Terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL)-positive nuclei were observed at 3 and 4 days after flowering (DAF). Transmission electron microscopy studies of differentiating MSEs revealed increased vacuolation, nuclear degeneration, chromatin condensation and localization to the periphery of the nucleus, and partly dilated perinuclear spaces, all typical characteristics of PCD in plant cells. In addition, vacuoles were disrupted at the last stages of differentiation. These results demonstrate that MSE differentiation is a unique type of PCD with highly selective autophagic processes, in which PCD ceases just prior to death. During this cessation of PCD, vacuoles and the endoplasmic reticulum appear to be associated with selective organelle digestion.
机译：透射电子显微镜（TEM）和荧光显微镜研究表明，发育中的小麦（Triticum aestivum L.）的柱头腹部腹维管束中的上皮韧膜筛元素（MSE）经历了独特类型的程序性细胞死亡（PCD）。在开花（DAF）后第3天和第4天观察到末端脱氧核苷酸转移酶介导的dUTP缺口末端标记（TUNEL）阳性核。分化的MSE的透射电子显微镜研究表明，空泡增多，核变性，染色质凝集和定位在核外围，以及部分扩张的核周空间，这是植物细胞中PCD的所有典型特征。另外，在分化的最后阶段液泡被破坏。这些结果表明，MSE分化是具有高度选择性自噬过程的PCD的独特类型，其中PCD在死亡之前就停止了。在停止PCD期间，液泡和内质网似乎与选择性细胞器消化有关。

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