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  • 1
    Electronic Resource
    Electronic Resource
    Phylogenetic relationships ofPythium species based on ITS and 5.8S sequences of the ribosomal DNA (1999)
    Springer
    Mycoscience 40 (1999), S. 321-331 
    Details
    ISSN: 1618-2545
    Keywords: Chromista ; internal transcribed spacer ; phylogeny ; Pythium ; 5.8S rDNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The sequences of ITS regions in 30 species and two groups of the genusPythium were resolved. In the phylogenetic trees, the species were generally divided into two clusters, referred to here as the F and S groups. The species in the two groups correspond in terms of their sporangial morphology, with the F group being filamentous/lobulate and the S group being spherical. Genetic divergence within the F group was lower than that within the S group. Other morphological characteristics such as oogonial structure and sexual nature appeared to be unrelated to the groupings in these trees. An alignment analysis revealed common sequences to all the species and arrangements specific to each F or S group. It was found that the ITS region was a good target in designing species-specific primers for the identification and detection ofPythium species. In the tree based on 5.8S rDNA sequences, oomycetes are distantly related to other fungi but separated from algae in Chromista.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02463876
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Growth promotion ability of zoysiagrass rhizosphere fungi in consecutive plantings of wheat and soybean (1996)
    Springer
    Mycoscience 37 (1996), S. 163-168 
    Details
    ISSN: 1618-2545
    Keywords: consecutive planting ; Phoma sp. ; plant growth-promotion ; potting medium ; soybean ; wheat ; zoysiagrass rhizosphere fungi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several isolates ofPhoma sp., certain nonsporulating fungi, as well asPenicillium andTrichoderma, all isolated from zoysiagrass rhizosphere, promoted growth of wheat and soybean under greenhouse conditions. However, the ability of these rhizosphere fungi to enhance plant growth varied with the crop tested. For example, most of the fungi effectively promoted the growth of wheat, whereas only a few fungi were effective on soybean. In consecutive plantings of wheat and soybean grown in soil previously infested with these zoysiagrass rhizosphere fungi, the growth promotion ability of the fungi was lowered. However, addition of fresh potting medium appeared to restore their growth-promotive effects. It appears that the activation of plant growth-promoting fungi in soil might depend on the availability of organic substrates to colonize, as evidenced by the promotion of plant growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02461341
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    Paper (German National Licenses)
    Fulltext
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