Question

求生物文献翻译：

Organellar changes during sporogenesis
Although the organellar lineages are unbroken during meiosis in Pteridium, distinct cycles of dedifferentiation and redifferentiation of the organelles undoubtedly occur. These cycles are similar in many respects to those described for angiosperms (see Dickinson and Heslop-Harrison, 1977, for review) but differ in several important aspects. The first departure from the small, rod-shaped form of mitochondria seen in somatic cells occurs before meiosis begins. The elaborate, branched mitochondrial profiles which characterize cells dividing to form meiocytes (Plate 1 B) have also been seen during spermatogenesis in ferns (Bell, unpublished observations), but their significance has not been elucidated. These extensively ramified organelles are thought to divide to form the rod-shaped mitochondria of pre-leptotene cells. The further contraction and simplification which produces the small, mostly spherical organelles with little internal structure seen in late prophase I reflects that seen in angiosperms (e.g. Bal and De, 1961) and lycopods (Pettitt, 1978) except that the Pteridium dedifferentiation seems to begin slightly earlier. The leptotene mitochondria are already quite rudimentary in Pteridium whereas those of Lilium, for example, are pleomorphic and display division profiles at this stage (Dickinson and Heslop-Harrison, 1977). The development of the circular type of cristae which begins in the diplotene/diakinesis period in Pteridium, a striking departure from

Answer 1

sporogenesis Organellar期间改变

虽然organellar血统被连续不断的减数分裂过程中发现,截然不同的周期Pteridium细胞器和redifferentiation无疑的发生。这些周期是类似的在很多方面阐述和Heslop-Harrison被子植物(见杂役,1977年,以供审查),但它不同于几个重要方面。第一个离开小,两种形式的线粒体看到在体细胞发生在减数分裂开始。精心准备的,分枝能力强。花期的细胞线粒体剖面特征划分,形成meiocytes(板1 B)也被发现在精子,中兴在蕨类(钟),但其意义观测尚未阐明。这些广泛的细胞器被认为分四通八达,形成了两种pre-leptotene线粒体的细胞。进一步收缩和简化生产小,大部分是用很少的内部结构球形细胞器中看到我反映出,见过晚前期:指在被子植物(例句。拜尔和绝望,1961年)和lycopods(Pettitt出版社,1978年版)除了稍早些时候似乎开始执行。线粒体是已经相当，而在初步的百合,举例来说,是多形性和显示在这个阶段划分型材,狄金森(1977年)。圆形的发展类型的嵴,终变期惊人的背离