Week 7: Phanerogemic parasites and a-biotic diseases in plants

More than 2500 species of higher plants are known to live parasitically on other plants. Their main common characteristic is that these parasites are vascular plants
that have developed specialized organs which penetrate the tissues of other (host) vascular plants, establish connections to the host plant vascular elements, and absorb nutrients from them.

Plants grow best within certain ranges of the various abiotic factors that make up their environment. Such factors include temperature, soil moisture, soil nutrients, light, air and soil pollutants, air humidity, soil structure, and pH. Although these factors affect all plants growing in nature, their importance is considerably greater for cultivated plants, which are often grown in areas that are at the margins and beyond their normal habitat and, therefore, that barely meet the requirements for normal growth.
 

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