RIBOSOMAL DNA AMOUNTS IN PISUM SATIVUM
نویسندگان
چکیده
منابع مشابه
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 ...
متن کاملDNA methylase from Pisum sativum.
DNA methylase activity was detected in nuclei from pea shoots. The enzyme can only be extracted by low-salt treatment if the nuclei are pretreated with micrococcal nuclease. Only a single enzyme was detected, and it was purified to a specific activity of 1620 units/mg of protein. It has an Mr of 160,000 on gel filtration and SDS/PAGE. Pea DNA methylase methylates cytosine in all four dinucleoti...
متن کاملDNA Strand-Transfer Activity in Pea (Pisum sativum L.) Chloroplasts.
The occurrence of DNA recombination in plastids of higher plants is well documented. However, little is known at the enzymic level. To begin dissecting the biochemical mechanism(s) involved we focused on a key step: strand transfer between homologous parental DNAs. We detected a RecA-like strand transfer activity in stromal extracts from pea (Pisum sativum L.) chloroplasts. Formation of joint m...
متن کاملDNA Strand - Transfer Activity in Pea ( Pisum sativum 1 . ) Chloroplasts ’
The occurrence of DNA recombination in plastids of higher plants is well documented. However, little is known at the enzymic level. To begin dissecting the biochemical mechanism(s) involved we focused on a key step: strand transfer between homologous parenta1 DNAs. We detected a RecA-like strand transfer activity in stromal extracts from pea (Pisum sativum 1.) chloroplasts. Formation of joint m...
متن کاملThe isoperoxidases of Pisum sativum.
The heterogeneity of the peroxidases in peas was examined by starch gel electrophoresis. Comparisons were made between tall and dwarf cultivars and among organ systems developed in light and darkness. Isoperoxidase bands could be grouped as cathodic, anodic and near-neutral (at pH 9.0) types. The cathodic set stained well with guaiacol oxidation products whereas some anodic bands reacted prefer...
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ژورنال
عنوان ژورنال: Genetics
سال: 1975
ISSN: 1943-2631
DOI: 10.1093/genetics/81.3.485