Copper enzymes in isolated chloroplasts. polyphenoloxidase in beta vulgaris
Reads0
Chats0
TLDR
Evidence that a copper enzyme, polyphenoloxidase (otherwise known as tyrosinase or catecholase), is localized in the chloroplasts of spinach beet (chard), Beta vu?garis is presented.Abstract:
The chloroplast, as the seat of chlorophyll pigments in plants, occupies a unique position in the economy of the green cell. In recent years there has been a renewed interest in the reactions and properties of chloroplasts as a result of the work of Hill (11, 12) and Hill and Scarisbrick (13, 14) who demonstrated that the reaction characteristic of photosynthesis in green plants, the evolution of oxygen, occurs in appreciable quantities in isolated chloroplasts under the influence of light and in the presence of suitable oxidants (2, 7, 8, 26). In the course of an investigation of oxygen evolution by isolated chloroplasts it was deemed important to explore their enzymatic composition. Of special interest were considered enzymes capable of participating in oxidation-reduction reactions, and more particularly, those localized principally, if not entirely, in the chloroplasts. This paper presents evidence that a copper enzyme, polyphenoloxidase (otherwise known as tyrosinase or catecholase), is localized in the chloroplasts of spinach beet (chard), Beta vu?garis.read more
Citations
More filters
Journal ArticleDOI
Sex-specific physiology and source-sink relations in the dioecious plant Silene latifolia.
TL;DR: It is concluded that females have a sink-regulated mechanism of photosynthesis that allows them to respond to variations in fruit set, and this mechanism is not, however, sufficient to explain why male S. latifolia plants have higher rates of photosynthetic rates, higher source/sink ratios, and lower reproductive allocation, but fail to grow larger than female plants.
Journal ArticleDOI
Multienzyme oxygen radical detoxifying system correlated with paraquat resistance in Conyza bonariensis
TL;DR: A biotype of Conyza bonariensis from an area with repeated paraquat treatments and a wild type from a pristine area were analyzed for resistance to paraquats and for enhanced levels of three enzymes thought necessary to detoxify oxygen radicals.
Journal ArticleDOI
Mn tolerance in rice is mediated by MTP8.1, a member of the cation diffusion facilitator family
Zonghui Chen,Yumi Fujii,Naoki Yamaji,Sakine Masuda,Yuma Takemoto,Takehiro Kamiya,Yusufujiang Yusuyin,Kozo Iwasaki,Shin ichiro Kato,Masayoshi Maeshima,Jian Feng Ma,Daisei Ueno +11 more
TL;DR: OsMTP8.1 is an Mn-specific transporter that sequesters Mn into vacuoles in rice and is required for Mn tolerance in shoots and is suggested to enhance Mn accumulation and tolerance in S. cerevisiae.
Journal ArticleDOI
Uptake and toxicity of Cr(III) in celery seedlings.
TL;DR: The study suggests for the first time a possible relationship between ubiquitination and Cr(III)-stress and the recruitment of the ubiquitin pathway to remove damaged or aberrant proteins which might have been produced in metal-treated seedlings.
Journal ArticleDOI
Increase of glycinebetaine synthesis improves drought tolerance in cotton
TL;DR: The results suggested that GB may not only protect the integrity of the cell membrane from drought stress damage, but also be involved in OA in transgenic cotton plants.
References
More filters
Journal ArticleDOI
Absorption of light by chlorophyll solutions
TL;DR: This paper deals with the estimation of chlorophyll in plant extracts by application of absorption coefficients of the isolated solid chlorophylla components, and the question of artifacts is automatically clarified.
Journal ArticleDOI
Microelements in culture-solution experiments with higher plants
TL;DR: This paper is a report on the observed responses from a group of elements not generally credited with a function in plant nutrition, which suggested that these and other elements, if present in minute quantity, may favorably influence the growth of plants.
Journal ArticleDOI
Cytochrome and Respiratory Enzymes
TL;DR: The results of this study will enable to determine the nature of the relationship between the oxidising enzymes and the intracellular haematin compounds, and this will help to elucidate at least one portion of the complicated respiratory mechanism, of the cell.
Journal ArticleDOI
Oxygen Evolved by Isolated Chloroplasts
TL;DR: The hæmoglobin method, originally used by Hoppe-Seyler to demonstrate oxygen from green plants, has been applied to study the oxygen evolution of isolated chloroplasts exposed to light.
Journal ArticleDOI
Oxygen Produced by Isolated Chloroplasts
TL;DR: Inman (1935) brought further evidence as to the enzymic nature of the process, and showed also that fresh green extracts of many phanerogams will evolve oxygen in light, using the bacterial mathod.