منابع مشابه
Nuclear DNA amounts in angiosperms: targets, trends and tomorrow.
BACKGROUND AND AIMS The amount of DNA in an unreplicated gametic chromosome complement is known as the C-value and is a key biodiversity character of fundamental significance with many practical and predictive uses. Since 1976, Bennett and colleagues have assembled eight compilations of angiosperm C-values for reference purposes and subsequently these have been pooled into the Angiosperm DNA C-...
متن کاملIntra- and Interpopulational Variation in the Amounts of Nuclear Dna in the Moss Pleurozium Schreberi
In Poland, the dioecious moss Pleurozium schreberi reproduces vegetatively, as in this area, there are exclusively plants of one sex. A karyotype analysis of polish populations of this moss revealed significant intra-and interpopulational variation in the karyotype formula, despite the uniform chromosome number n=5. The haploid set consists of three chromosome types: metacentric, submedian and ...
متن کاملRibosomal DNA Amounts in PISUM SATIVUM.
Different varieties of peas have different proportions of rDNA in their genomes; there is no obvious correlation between the proportions and seed or leaf size. The rDNA proportions in root tips, seedlings, leaves and in the cotyledon cells of high DNA content, were compared in four varieties. In three, there was no difference between tissues; the fourth showed an amplification of rRNA genes in ...
متن کاملEvolution and biogeography of gymnosperms.
Living gymnosperms comprise only a little more than 1000 species, but represent four of the five main lineages of seed plants, including cycads, ginkgos, gnetophytes and conifers. This group has huge ecological and economic value, and has drawn great interest from the scientific community. Here we review recent advances in our understanding of gymnosperm evolution and biogeography, including ph...
متن کاملPhylogeny and Divergence Times of Gymnosperms Inferred from Single-Copy Nuclear Genes
Phylogenetic reconstruction is fundamental to study evolutionary biology and historical biogeography. However, there was not a molecular phylogeny of gymnosperms represented by extensive sampling at the genus level, and most published phylogenies of this group were constructed based on cytoplasmic DNA markers and/or the multi-copy nuclear ribosomal DNA. In this study, we use LFY and NLY, two si...
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ژورنال
عنوان ژورنال: Annals of Botany
سال: 1998
ISSN: 0305-7364
DOI: 10.1006/anbo.1998.0764