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ManyDrechslera species that haveCochliobolus sp. as a perfect stage produce a related group of ophiobolins, sesterterpenoids (C-25’s), which are phytotoxic to a wide
range of plants. One of the most toxic ophiobolins is 6-epiophiobolin A and it is produced by all of theDrechslera species thus far studied. On the other hand, some novel ophiobolins have been found inD. oryzae: ophiobolin J, 6-epiophiobolin I, and 8-deoxyophiobolin J. Potentially, genetic crosses made between these fungi could yield
novel organisms, producing novel combinations of the ophiobolins, and thus new pathotypes. Ophiobolins are being used in tissue
culture systems to screen plants for sensitivity to these toxins.
Paper presented at the Bat-Sheva Seminar on Host - Fungus Interaction, Jerusalem, Israel (March 14–25,1988). 相似文献
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Jules Désiré Djoukeng Suzanna Polli Philippe Larignon Eliane Abou-Mansour 《European journal of plant pathology / European Foundation for Plant Pathology》2009,124(2):303-308
A bioassay-guided fractionation of a culture filtrate of Botryosphaeria obtusa led to the isolation of four dihydroisocoumarins, named mellein 1, 4-hydroxymellein 2, 7-hydroxymellein 3 and the new 4,7-dihydroxymellein
4. LC-UV-DAD-MS analysis of vine wood infected by B. obtusa revealed the presence of mellein (1). Botryosphaeria obtusa was also able to oxidise wood δ
-resveratrol into the dimer delta-viniferin. The structures of isolated phytotoxins were established on the basis of IR, MS, 1D and 2D NMR. 相似文献
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Production of hydrophilic phytotoxins by <Emphasis Type="Italic">Mycosphaerella fijiensis</Emphasis>
Carlos A. Cruz-Cruz Karlina García-Sosa Fabiola Escalante-Erosa Luis M. Peña-Rodríguez 《Journal of General Plant Pathology》2009,75(3):191-195
We have established a reproducible strategy to purify hydrophilic phytotoxins present in the aqueous filtrate of Mycosphaerella fijiensis Morelet. The lyophilized culture filtrate is initially treated with activated charcoal, then successively purified using
vacuum liquid chromatography and semipreparative high performance liquid chromatography. Phytotoxic activity was tested using
a leaf-spot assay on healthy banana leaves.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
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Summary Acetic acid production over 10 days from fresh barley straw was greater than that from fresh wheat straw, but there were only minor consistent differences between different cultivars. The effect depended on the soil type on which the straw had been produced and acid production was greatest with the largest amounts of N fertilizer which had been used. The fertilizer also affected the C:N ratio of the straw 相似文献
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