Download e-book for iPad: Advances in Botanical Research by J. A. Callow

Download e-book for iPad: Advances in Botanical Research by J. A. Callow

By J. A. Callow

This quantity of Advances in Botanical learn incorporating Advances in Plant Pathology comprises 5 stories on numerous subject matters including:* Foliar Endophytes and Their Interactions with Host crops, with particular connection with the Gymnospermae* crops looking for solar* The Mechanics of Root Anchorage* Molecular Genetics of Sulphate Assimilation* Pathogenecity, Host-specificity, and inhabitants Biology of Taesia spp, Causal brokers of Eyespot ailment of Cereals

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True endophytes colonize their host without any symptom expression. They are able to colonize a wide variety of hosts but some endophytic species show strong specificity towards specific host plants. Gymnospermae, which have quite unique types of leaves, harbour their own specialized group of foliar endophyte species. In order to understand the role of foliar endophytes completely, it is important to study the adaptation of endophytes to their specific environment, as well as the environmental factors that contribute to the different colonization patterns encountered in the host plant.

Substrate Utilization Endophytes may develop distinct substrate utilization patterns. For instance, fungi from needle-bearing conifers show specialization in their utilization capabilities. Fungi occurring only in the petioles have a broad range of substrate utilization capabilities, but those occurring in the needle blades have more restricted abilities (Carroll and Petrini, 1983). Even isolates from the same fungal species may differ in their substrate utilization. Differences in utilization also ensure that several endophytes can coexist within a single needle, without competing with each other.

Growth promotion. Some endophytes promote growth of their host plants. Leptodontium orchidicola Sigler and Currah, a dematiacious hyphomycete isolated from roots of subalpine plants, caused a significant increase in host root length of Salix glauca L. seedlings, but the fungus also invaded the stele, causing extensive cellular lysis (Fernando and Currah, 1996). The effects of four different strains of L. orchidicola were strain- and host-specific, and the symbiotic associations varied from mycorrhizal to parasitic.

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