Stimulation of sexual reproduction in Phytophthora cactorum by phospholipids is not due to sterol contamination

Article Abstract:

Oospore formation by Phytophthora cactorum in the presence of phospholipids were analyzed to characterize the biochemical effects of of sterols and inhibitory substances in lecithin and cephalin. The removal of putative sterol contaminant in lecithin and cephalin in Phytophthora cactorum basal medium enhanced the ability of the phospholipids to induce oospore formation. Furthermore, the stimulatory effects of the non-phospholipid fraction to oospore formation were not dependent on the presence of sterols in lecithin and cephalin.

Fungi, Phospholipids, Reproduction (Biology), Lecithin, Sterols

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Tactic response of zoospores of the fungus Phytophthora palmivora to solutions of different pH in relation to plant infection

Article Abstract:

Microbial pathogens such as Pythophthora palmivora may be able to seek out wounded plant roots due to the differences in pH gradients in the roots. Observations of the behavior of zoospores in varying pH gradients showed that they were readily attracted to regions of low pH, which are characteristic of wounded and infectable roots and were averse to regions of high pH. The pH gradients in plant roots are known to be caused by electrical currents generated by ion-conducting proteins.

Environmental aspects, Plant-pathogen relationships, Plant diseases, Fungi, Pathogenic, Pathogenic fungi

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Chemotactic preferences and strain variation in the response of Phytophthora sojae zoospores to host isoflavones

Article Abstract:

The chemotactic response of Phytophthora sojae zoospores to the isoflavones, genistein and daidzein, released by soybean roots, is due to the presence of the phenolic 4'- and 7-hydroxyl groups on the isoflavones. The methylated flavones with a hydrophobic B ring act as repellants. Some strains exhibit chemotaxis specificity because of the coevolution of their genotypes with the plant. P. sojae has several receptors for different type of responses.

Research, Analysis, Observations, Chemotaxis, Flavonoids, Flavones, Pathogenic microorganisms, Host-parasite relationships

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