Phyto-stimulatory activity of some fungal bio-agents on the growth of sunflower (Helianthus annuus L.)

Lokesh, S. and Murthy, N. (2014) Phyto-stimulatory activity of some fungal bio-agents on the growth of sunflower (Helianthus annuus L.). International Journal of Agricultural Science and Research, 4 (1). pp. 7-16. ISSN 2321-0087

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Abstract

While screening an array of beneficial microbes, some isolates of Trichoderma harzianum and Chaetomium globosum showed their promising effect in enhancing seed germination and seedling vigour of sunflower. Higher percentage of germination (94%) was observed in seeds treated with Chaetomium globosum compared to 68 % in control. Trichoderma harzianum isolates had almost same stimulatory effect on seed germination, root, shoot growth and vigor index. The seeds treated with culture filtrate of T. harzianum and C. globosum, significantly enhanced the seed germination by 88 and 90%, compared to their respective control. As the consequence, the survivability of seedlings was more; the plants were tall, vigorous and more robust. The treatment also increased the lamina area, number of flowers and head diameter, which were healthy and uniform among replicates The proportion of plants that attained flowering was higher in the treated set (64 and 74%) compared to that of control (25 to 30 %), the length and width of leaves and the diameter of the heads were also found significantly increased in the treated plants. The incidence of Aspergillus flavus and A. niger was also found depleted in the seeds, treated with bio-agents. Incidence of the pathogenic fungus, Macrophomina phaseolina was reduced from 36 to 4 % and 41 to 6 % respectively, in the treated seeds. Incidence of Alternaria species was also reduced significantly in the bio-agents culture filtrate treatment.The average lipoxygenase activity of seven-day-old sunflower seedlings was 0.56 and 0.61 for control sets C1 and C2 and 1.01 and 0.94 for T. harzianum and C. globosum treatments, respectively. The results indicated that there was about 71 and 59 per cent increase in the enzyme activity in T. harzianum and C. globosum treated seedlings of sunflower, compared to their respective control.

Item Type: Article
Additional Information: Unmapped bibliographic data: JO - International Journal [Field not mapped to EPrints]
Subjects: Agriculture Biological Sciences > Biotechnology
University of Mysore > PG Campuses > Manasagangotri, Mysore > Agriculture Biological Sciences > Biotechnology

Agriculture Biological Sciences > Sericulture
University of Mysore > PG Campuses > Manasagangotri, Mysore > Agriculture Biological Sciences > Sericulture
Divisions: PG Campuses > Manasagangotri, Mysore > Biotechnology
PG Campuses > Manasagangotri, Mysore > Sericulture Science
Depositing User: Praveen Kumari B.L
Date Deposited: 12 Jun 2014 06:34
Last Modified: 12 Jun 2014 06:34
URI: http://eprints.uni-mysore.ac.in/id/eprint/16873

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