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Biological sciences

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Stromal development and mating system of Balansia epichloe, a leaf- colonizing endophyte of warm-season grasses

Article Abstract:

Balansia epichloe is an endophytic fungus that colonizes grass leaves without utilizing seed transmission as its means ofproliferation. Growth studies show the important role sucrose plays in its stromatal development. This sugar exerts its inhibitory effect after it is converted by fungal enzymes into its monomers, glucose and fructose, which affect the fungus differently. The former serves as nutrient while the latter serves as inhibitor. Sufficient intercepted nutrient means stromatal development that proceeds to the development of perithecia when conidia are produced from stromata of opposite mating types. Inhibition is attributed to the presence of high sugar concentration surrounding the inflorescence that prevents seed transmission in this fungus.

Physiological aspects, Fungi, Evolution (Biology), Microorganisms, Parasites, Host plants

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Phoma glomerata as a mycoparasite of powdery mildew

Article Abstract:

Researchers report the identification of Phoma glomerata as an important biocontrol agent of powdery mildew. Powdery mildews are common plant pathogens. Phoma species have often been confused with Ampelomyces but sequence analysis of ribosomal DNA internal transcribed spacer region 1 shows that it is a separate genus.

Powdery mildew diseases

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Zoospore homing and infection events: effects of the biocontrol bacterium Burkholderia cepacia AMMDR1 on two oomycete pathogens of pea (Pisum sativum L.)

Article Abstract:

Burkholderia cepacia AMMDR1 appears to prevent pathogens of pea seeds from infecting the seed through a combination of antibiosis and competition for seed compounds that attract the pathogen zoospore. Burkholderia cepacia AMMDR1 is a biological control agent used to protect pea and corn seeds from Pythium damping-off.

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