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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Nuclear crystals, lampbrush-chromosome-like structures, and perinuclear cytoskeletal elements associated with nuclear fragmentation in characean internodal cells
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Nuclear crystals, lampbrush-chromosome-like structures, and perinuclear cytoskeletal elements associated with nuclear fragmentation in characean internodal cells

机译：Characean结节间细胞中与核碎裂有关的核晶体，电灯泡染色体样结构和核周细胞骨架元素

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This article gives a survey of nucleus-associated structures and inclusions in a diverse range of characean algae including Chara braunii Gm., Chara corallina Klein ex Willd.. em. R.D.W., Nitella cristata A.Br.. em. R.D.W., Nitella flexilis (L.) As., Nitella furcata (Roxb. ex Bruz.) Ag. em. R.D.W., Nitella hyalina (DC.) Ag., Nitella pseudoflabellata A. Br., em. R.D.W., Nitella pseudoflabellata var, imperialis T.F.A., Nitella translucens var. axillaris (A.Br.) R.D.W. and Nitellopsis obtusa (Desv. in Lois.) J.Gr. Lampbrush-chromosome-like structures were found in nuclei of Nitella flexilis and Nitellopsis obtusa and seem to be involved in the distribution of genetic material during nuclear fragmentation. Intranuclear tubular crystals of unknown protein composition were present in all species, especially in young, elongating cells, and could be important for establishing the main axis of the nuclei. Spindle-shaped protein crystals that originate in the nucleus and are released into the cytoplasm upon nuclear degeneration were observed in branchlet internodal cells of one population of Nitella flexilis. Perinuclear microtubules were present in all species, but perinuclear actin fibrils were hitherto only found in most Nitella species and in Nitellopsis obtusa. None of these nucleus-associated structures seems to be responsible for the formation of constrictions leading to nuclear fragmentation. These constrictions were perpendicular to the main axis of the nucleus and symmetrical in the Nitella species but asymmetric in C. braunii, C. corallina, and in Nitellopsis obtusa. Statistically analysis of nuclear size, number and constriction sites indicate that fragmentation is a nonsynchronous process independent of the light-dark cycle. [References: 49]
机译：本文对包括Chara braunii Gm。，Chara Corallina Klein ex Willd .. em在内的各种characean藻类进行了与核相关的结构和内含物的调查。 R.D.W.，Nitella cristata A.Br .. em。 R.D.W.，Nitella flexilis（L.）As。，Nitella furcata（Roxb.ex Bruz。）Ag。 em。 R.D.W.，Nitella hyalina（DC。）Ag。，Nitella pseudoflabellata A.Br.，em。 R.D.W.，Nitella pseudoflabellata var，imperialis T.F.A.，Nitella translucens var。腋窝（A.Br.）R.D.W. J.Gr. and obtella obtusa（Deisv。in Lois。）在屈状线虫（Nitella flexilis）和小球藻（Nitellopsis obtusa）的核中发现了类似灯体-染色体的结构，似乎与核碎裂过程中遗传物质的分布有关。未知蛋白质组成的核内管状晶体存在于所有物种中，特别是在年轻的伸长细胞中，并且对于建立核的主轴可能很重要。在一群尼氏菌中，在小核节间细胞中观察到起源于细胞核并在核变性后释放到细胞质中的纺锤状蛋白晶体。在所有物种中都存在核周微管，但是迄今为止，仅在大多数尼特拉菌属物种和钝齿猪笼草中才发现核周肌动蛋白原纤维。这些与核相关的结构似乎都不负责导致核碎裂的收缩。这些收缩垂直于细胞核的主轴，在Nitella物种中是对称的，但在C. braunii，C.corallina和Nitellopsis obtusa中是不对称的。对核的大小，数量和收缩位点的统计分析表明，碎片是一个独立于明暗循环的非同步过程。 [参考：49]

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