By Karl Esser, Ulrich Lüttge, Wolfram Beyschlag, Jin Murata
With one quantity every year, this sequence retains scientists and complicated scholars knowledgeable of the newest advancements and ends up in all parts of the plant sciences.The current quantity comprises experiences on genetics, mobilephone biology, body structure, comparative morphology, systematics, ecology, and crops technology.
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Additional resources for Progress in Botany, Vol. 67
Sample text
Most remarkably, exposure of young fruiting bodies of the knockout mutant to 200 Gy of γ-rays led to the appearance of many Rad51 foci at leptotene, restoration of homologous synapsis and formation of chiasmata. Thus γ-ray-induced double strand breaks can substitute for the double strand breaks formed by the transesterification reaction of the Spo11 topoisomerase. It is likely that the homologous pairing and synaptonemal complex formation in Bombyx females and polyploid plants also is initiated at leptotene and zygotene by topoisomerase-formed double strand breaks, but that these organisms have evolved mechanisms to prevent the consequences of multivalent formation at diplotene by untimely resolutions into reciprocal crossing-overs.
However mixtures of the mutated and wild type BchI subunits could form oligomeric complexes with the D and H subunits. The oligomerization is ATP dependent but results in complexes lacking Mg-chelatase activity. Furthermore the presence of mutant BchI subunits in the oligomer did not inhibit the ATPase activity of the wild type subunits but prevented the insertion of Mg2+ into prototoporphyrin IX. It is suggested that a small amount of hexamers consisting only of wild type subunits rescues the heterozygous plants.
A distance almost equivalent to the diameter of the nucleus. The close agreement of the length of two lateral components in each of the 12 partially paired bivalents showed that the lateral component, and thus the chromosome length is determined before the site-to-site synapsis is initiated. From the large number of reconstructions of zygotene nuclei in several species, it became evident that the length of a particular chromosome pair varies in different meiocytes of the same individual, while the lateral components of homologues within the nucleus are of equal or nearly equal length.