Download Agricultural biotechnology : country case studies : a decade by Gabrielle J Persley, L R MacIntyre PDF

By Gabrielle J Persley, L R MacIntyre

Following on from prior titles during this sequence, this quantity offers additional fabric generated by way of the realm Bank/ISNAR/Australian executive biotechnology learn. It covers the current prestige and destiny clients for the appliance of biotechnology to unravel agricultural and environmental difficulties in a couple of constructing nations. specific concentration is given directly to advancements that experience taken position over the past decade.

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As with protozoa, the role of nematodes in soil systems relates to their feeding activities, and can be direct via the excretion of nutrients into soil or indirect through altering the size, composition, and activity of the microbial community. e. microbes adhering to the surface of larger organisms) or excretion of viable microbes. Plant-parasitic nematodes are increasingly being shown to have important direct effects on plant communities. All these roles will be discussed in more detail in later chapters.

1995). Some ecologists actually doubt whether latitudinal patterns of soil biological diversity exist at all, at least across temperate and tropical regions. The rationale for this is that many soil organisms, especially the microfauna and microbes, are cosmopolitan, being able to migrate extensively across the globe (Roberts and Cohen 1995; Finlay et al. 1999). Furthermore, the abundance of individuals of free-living microbial species is so large that their dispersal is rarely (if ever) restricted by geographical barriers (Finlay 2002).

Three main types of mycorrhizal association are detailed below, whereas their ecological significance is considered in Chapter 4. Ectomycorrhizas (EM fungi). These are most abundant in temperate and Boreal forest ecosystems where they infect roots of trees and shrubs, but especially coniferous species that are often exclusively EM. The diagnostic feature of EM associations is the presence of fungal hyphae between root cortical cells to form a complex, intercellular system called the Hartig net. Some fungi also form a sheath or mantle of fungal tissue that completely covers the root.

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