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Bacterial antagonists of Sunflower (Helianthus annuus L.) fungal pathogens by P. Hebbar; O. Berge; T. Heulin; S. P. Singh is a Agricultural and Biological Sciences article available to read on EtoBox.

What is Bacterial antagonists of Sunflower (Helianthus annuus L.) fungal pathogens about?

Bacteria isolated on nutrient agar and King's medium B from sunflower leaves, crown and roots inhibited in vitro growth of the leaf spot and wilt pathogens Alternaria helianthi, and Sclerotium rolfsii, respectively, and also the root rot pathogens Rhizoctonia solani and Macrophomina phaseolina. Antagonistic bacteria from leaves were mainly actinomycetes and pigmented Gram-positive bacteria, while those from roots and crowns were identified as Pseudomonas fluorescens-putida, P. maltophilia, P. cepacia, Flavobacterium odoratum and Bacillus sp. In soil bioassays, when used as seed inoculum in the presence of S. rolfsii, P. cepacia strain N24 increased significantly the percentage of seedling emergence. Bacterial strains which exhibited broad spectrum in vitro antagonistic activity were tested for colonisation of sunflower roots, when used as a seed inoculum. Good colonisers (104 to 106 bacteria/g root) were consistent in their ability to reduce disease and fungal wilt. A seedling having a primary root length <5 cm with fewer lateral roots, necrosed cotyledons or crown and a wilted shoot indicated its diseased status. On an average, only 30% of seedlings were diseased when treated with

Who reads Bacterial antagonists of Sunflower (Helianthus annuus L.) fungal pathogens?

Author

P. Hebbar; O. Berge; T. Heulin; S. P. Singh

Publisher

Springer; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0032-079X)

Published

1991

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)