Vegetable species differentiation

Maximum chlorophyll absorption Species differentiation and assessment of vegetation vigour... 

Susceptibility of vegetation to air pollutant injury is reportedly influenced by many climatic factors, edaphic factors, genetic variability, and by structural and biochemical variations in the plant. Observed differences in susceptibility have prompted numerous attempts to prepare lists of plant species according to susceptibility or tolerance to specific air pollutants. It has become apparent that such lists are frequently inaccurate because the differential in susceptibility within a single variety or cultivar may be as great as that between species. 

Perchlorate is concentrated by plants, especially in the leaves, that are irrigated with water-containing perchlorate. Perchlorate has been detected in vegetation and wildlife (aquatic insects, fish, frogs, mammals) near an ammunition plant historically associated with perchlorate-containing rocket propellants. There has been limited testing of perchlorate in aquatic species, soil invertebrates, and amphibians. Results in aquatic species are inconclusive because of the lack of cation controls. Perchlorate appears to inhibit thyroid activity and alter gonadal differentiation in amphibians at concentrations found in surface water. 

The mechanisms by diich microorganisms differentiate, i.e., make the transition from vegetative growth to spore formation, are being sought at the levels both of transcription and of translation. Antibiotics, particularly the peptides made by mendsers of the Baai-llue species, are under scrutiny as possible effectors in sporulation. 

The transition from vegetative cells to spores is an unicellular differentiation process which occurs for many bacterial species under appropriate environmental conditions. The morphological changes which occur during sporulation are divided into six main stages 1. Axial filament formation, 2. Septum formation, 3. Development of... 

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