Isolation and characterization of a novel chytrid species (phylum Blastocladiomycota), parasitic on the green alga Haematococcus

Hoffman, Yoram; Aflalo, Claude; Zarka, Aliza; Gutman, Jenia; James, Timothy Y.; Boussiba, Sammy

doi:10.1016/j.mycres.2007.09.002

Cited by 120 publications

(120 citation statements)

References 34 publications

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“…Karling (1964) points out that the presence of conical pore of empty sheath is an indicator of the presence of prosorial stage in the life cycle of . The resting spore of the product of mating of two different types of zoospore (Karling 1964;Garcia Massini 2007), especially when the environment is unfavorable (Hoffman 2008). Based on the current observation, it is inferred that infecting belongs to the long lifecycle type, and this phenomenon is reported for the first time in the present study.…”

Section: Discussionsupporting

confidence: 59%

The Life Cycle of Synchytrium pogostemonis on Pogostemon cablin

Wahyuno¹

2010

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Synchytrium pogostemonisS. pogostemonis. S. pogostemonisSynchytrium, Pogostemon cablin became a serious disease of patchouli cultivation in Indonesia, since it spread widely in many patchouli producing areas in Indonesia. The fungus caused warts on leaves, petioles and young stems of infected patchouli. The infected plant developed rosette habit, lost its vigour, was susceptible to drought period and finally died. Few information regarding the eco-biology and life cycle of the fungus were available The present research aimed at describing the life cycle ofThe diseased patchouli was obtained through artificial inoculation. Mass inoculation was carried out by placing the healthy patchouli seedling close to diseased patchouli as source of inoculum and was watered regularly using the top head sprinkler . The infected leaves were observed both under disecting and light compound microscopes, and the existing fungal structure were recorded, described and measured. It was observed that is a long-cycle type fungus, the sexual reproduction was initiated by zoospores, followed subsequently by development of resting-structure spores, vesicles, sori, and sporangial formation.

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Section: Discussionsupporting

confidence: 59%

The Life Cycle of Synchytrium pogostemonis on Pogostemon cablin

Wahyuno¹

2010

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“…Mass culture of Haematococcus can be contaminated by fungal parasites and zooplanktonic predators (e.g., amoebas, ciliates, and rotifers), as well as other microalgae and cyanobacteria, resulting in reduced biomass yield and quality, and sometimes loss of culture all together. A parasitic blastoclad fungus identified as Paraphysoderma sedebokerensis is the most devastating disease responsible for reduced astaxanthin productivity and frequent culture collapses (Hoffman et al 2008, Gutman et al 2009). Hoffman et al (2008) made detailed observations on the infection of Haematococcus culture by the parasite P. sedebokerensis (Hoffman et al 2008).…”

Section: Acknowledgementmentioning

confidence: 99%

“…A parasitic blastoclad fungus identified as Paraphysoderma sedebokerensis is the most devastating disease responsible for reduced astaxanthin productivity and frequent culture collapses (Hoffman et al 2008, Gutman et al 2009). Hoffman et al (2008) made detailed observations on the infection of Haematococcus culture by the parasite P. sedebokerensis (Hoffman et al 2008). During the infection process, healthy green culture turns dark brown, accompanied by the formation of large clumps consisting of living cells, cell debris, and particulate organic matters.…”

Section: Acknowledgementmentioning

confidence: 99%

“…During the infection process, healthy green culture turns dark brown, accompanied by the formation of large clumps consisting of living cells, cell debris, and particulate organic matters. A more vivid red color of culture can be first observed if infection occurred at the red stage, followed by gradual bleaching of algal cells (Hoffman et al 2008).…”

Section: Acknowledgementmentioning

confidence: 99%

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Astaxanthin in microalgae: pathways, functions and biotechnological implications

Han¹,

Li²,

Hu³

2013

ALGAE

177

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Major progress has been made in the past decade towards understanding of the biosynthesis of red carotenoid astaxanthin and its roles in stress response while exploiting microalgae-based astaxanthin as a potent antioxidant for human health and as a coloring agent for aquaculture applications. In this review, astaxanthin-producing green microalgae are briefly summarized with Haematococcus pluvialis and Chlorella zofingiensis recognized to be the most popular astaxanthin-producers. Two distinct pathways for astaxanthin synthesis along with associated cellular, physiological, and biochemical changes are elucidated using H. pluvialis and C. zofingiensis as the model systems. Interactions between astaxanthin biosynthesis and photosynthesis, fatty acid biosynthesis and enzymatic defense systems are described in the context of multiple lines of defense mechanisms working in concert against photooxidative stress. Major pros and cons of mass cultivation of H. pluvialis and C. zofingiensis in phototrophic, heterotrophic, and mixotrophic culture modes are analyzed. Recent progress in genetic engineering of plants and microalgae for astaxanthin production is presented. Future advancement in microalgal astaxanthin research will depend largely on genome sequencing of H. pluvialis and C. zofingiensis and genetic toolbox development. Continuous effort along the heterotrophic-phototrophic culture mode could lead to major expansion of the microalgal astaxanthin industry.

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“…The microalgae in their natural habitat, such as extensive and intensive cultures developed by aquaculture, are affected by different types of biological contaminants, among which are viruses, bacteria, protists, fungi and several predators (Hoffman et al, 2008). Microorganisms influence negatively the microalgal growth and the quality of the product (Richmond, 2000), being most significant in intensive outdoor mass cultures, where the microorganisms can compete for nutrients, and graze upon the microalgae, reducing drastically the commercial production (Richmond & Becker, 1986;Contreras et al, 2003;Ugwu et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Control of Branchionus sp. and Amoeba sp. in cultures of Arthrospira sp.

Méndez

Uribe

2012

lajar

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ABSTRACT. Cultivation of cyanobacterium Arthrospira sp. has been developed in many countries for the production of proteins, pigments and other compounds. Outdoor mass cultures are often affected by biological contamination, drastically reducing productivity as far as bringing death. This study evaluates the control of Branchionus sp. and Amoeba sp. with two chemical compounds: urea (U) and ammonium bicarbonate (AB), in laboratory conditions and outdoor mass culture of Arthrospira sp. The lethal concentration 100 (LC100) at 24 h for Branchionus sp. and Amoeba sp. determined was of 60-80 mg L -1 (U) and 100-150 mg L -1 (AB). The average effective inhibition concentration for 50% of the population (IC50) in Arthrospira sp., after 72 h, was 80 mg L -1 (U) and 150 mg L -1 (AB). The application of doses of 60 mg L -1 (U) or 100 mg L -1 (AB) in the outdoor mass culture of this contaminated microalga, completely inhibited grazing and did not affect the growth of Arthrospira sp. but rather promoted rapid recovery of algal density at levels prior to infestation. These compounds provided an economical and effective control of predators in cultures of Arthrospira sp.

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Isolation and characterization of a novel chytrid species (phylum Blastocladiomycota), parasitic on the green alga Haematococcus

Cited by 120 publications

References 34 publications

The Life Cycle of Synchytrium pogostemonis on Pogostemon cablin

The Life Cycle of Synchytrium pogostemonis on Pogostemon cablin

Astaxanthin in microalgae: pathways, functions and biotechnological implications

Control of Branchionus sp. and Amoeba sp. in cultures of Arthrospira sp.

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