Nuclear DNA Amounts in Pteridophytes

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-...

Intra- 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 ...

Ribosomal 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 ...

Bryophytes, and Pteridophytes in Tropical Ecosystems

Atrazine in sub-acute exposure results in sperm DNA disintegrity and nuclear immaturity in rats

This study was designed to evaluate the detrimental effect of atrazine (ATR) on germinal epitheliums (GE) cytoplasmic carbohydrate (CH) and unsaturated fatty acids (UFA) ratio and to clarify the effect of ATR on serum levels of FSH, LH, testosterone and inhibin-B (INH-B). The impact of ATR exposure on total antioxidant capacity (TAC), sperm DNA packing and integrity were also investigated. Seve...