Viruses are catalysts of biogeochemical cycling, architects of microbial community structure, and terminators of phytoplankton blooms. Viral lysis of diatoms, a key group of eukaryotic phytoplankton, has the potential to impact carbon export and marine food webs. However, the impact of viruses on diatom abundance and community composition is unknown. Diatom-virus dynamics were explored by sampl...

this study was conducted to determine physiological and morphological variation of strains of the ectomycorrhizal fungus hebeloma cylindrosporum associated with pinus pinaster and its consequence on the symbiotic processes in coastal forests adjacent to bordeaux, south west france, from 2003-2005. mycelial cultures were conducted in the laboratory on a rich medium (ymg). diploid fungal strains ...

Die-back disease caused by Paecilomyces variotti is one of the most destructive diseases of pistachio in Iran. In this study, genetic diversity of Paecilomyces variotti isolates was investigated with SSR marker, using six primers pairs. Sampling was done from pistachio gardens in different geographical zones of Kerman province during summer 2013. Various fungal isolates were isolated from infec...

Isozyme phenotypes were determined for 101 strains of Gibberella fujikuroi and 2 strains of Gibberella nygamai that represent seven biological species (mating populations) isolated from a variety of plant hosts in dispersed geographic locations. Fourteen enzymes were resolved in one or more of three buffer systems. Two of the enzymes, arylesterase and acid phosphatase, were polymorphic within t...

In basidiomycetous fungi, the viability of basidiospores is an important component of sexual fitness. However, relatively little is known about the genetic and environmental factors influencing basidiospore germination. In this study, we used human opportunistic yeast pathogens, Cryptococcus neoformans and Cryptococcus deneoformans, as models to investigate the potential effects of selected gen...

I N bacteriophage T2 the host range ( h ) region controls the specific adsorption properties of the phage particles. The original isolate, T2h+, adsorbs to E. coli strain B, but not to the mutant strain B/2. Spontaneous T2h mutants can be isolated from T2hf which now adsorb to both cell strains. STREISINGER and FRANKLIN, working with T2L, first investigated the genetic properties of this host r...

Determining the extent of reproductive isolation in cryptic species with dynamic geographic ranges can yield important insights into the processes that generate and maintain genetic divergence in the absence of severe geographic barriers. We studied mating patterns, propensity to hybridize in nature and subsequent fertilization rates, as well as survival and development of hybrid F1 offspring f...