Pathogen-driven forest diversity

Article Abstract:

Research undertaken in a black cherry forest near Bloomington, IN, has considered why some forests are more heterogeneous than others with regard to the tree species they contain. It was established that, because a particular soil pathogen lives on the roots of mature black cherry trees, the dispersal of black cherry seeds away from their parents is vital for the creation of saplings. It seems that the aggressiveness of soil pathogens gives little, if any, chance for the selection of pathogen-resistant host plant genotypes. Escape by dispersal may be the best solution for plants in their battle with soil pathogens, which do not disperse as readily as above-ground pathogens.

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Soil pathogens and spatial patterns of seedling mortality in a temperate tree

Article Abstract:

The Janzen-Connell mechanism functions within temperate forests, according to research investigating whether negative plant-soil feedback was taking place in Prunus serotina (black cherry). Demographic censuses were carried out beneath six focal black cherry trees from 1996 to 1998. It was found that mean distance to parent of survivors was substantially greater than that of germinating seedlings for 1996 and 1998 cohorts. Only heterospecific adults arose within the arcs, indicating that mortality attributable to soil pathogens favours heterospecific recruitment regardless of the high level of black cherry seed dispersal.

Seedlings, Agricultural products quality

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Fungi and the food of the gods

Article Abstract:

According to recent findings, a group of microbes known as 'endophytes' fungi provide their host plants with an effective defense against pathogens. The report on the endophytes and the disease incidence in cacao trees is reported.

Science & research, Fruits and tree nuts, not elsewhere classified, All Other Miscellaneous Crop Farming, Cocoa Beans, Research, Influence, Endophytes, Cacao, Host plants, Cacao beans

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