Production of chlamydospores and conidia in submerged culture by Rhynchosporium alismatis, a mycoherbicide of Alismataceae in rice crops.

Sophie Cliquet, Gavin Ash, Eric John Cother

Research output: Contribution to journalArticle

Abstract

The objective of this work was to evaluate the production of chlamydospores and conidia of Rhynchosporium alismatis in a liquid Czapex-Dox based medium supplemented with increasing concentrations of sodium nitrate and malt extract. In addition, the germination of chlamydospores was evaluated. A high concentration of malt extract (4.4 g L-1) as the sole carbon source and a high level of sodium nitrate as the sole nitrogen source (3.3 g L-1) were shown to increase chlamydospore production while agitation (150 rpm) enhanced conidial yields. Maximum chlamydospore production (2.03times105±0.7 total chlamydospores mg DW-1) was achieved in cultures grown in a medium supplemented with 8.8 g L-1 malt extract and 5.74 g L-1 sodium nitrate. Two days growth was required for maximum chlamydospore and conidial production, while 6 days was necessary to obtain maximum dry weight accumulation (350 mg per flask). Germination of chlamydospores (90%) was significantly higher than germination of conidia (47%) after 2 days growth.
Original languageEnglish
Pages (from-to)801-810
Number of pages10
JournalBiocontrol Science and Technology
Volume14
Issue number8
DOIs
Publication statusPublished - 2004

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