Effects Produced on Tomato Plants,<i>Lycopersicum esculentum</i>, by Seed or Root Treatment with Gibberellic Acid and Indol-3yl-Acetic Acid

Brown, Michael; Jackson, R. M.; Burlingham, Susan K.

doi:10.1093/jxb/19.3.544

Cited by 24 publications

(14 citation statements)

References 6 publications

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“…lycopersici overcame by virtue of its high competitive saprophytic ability (EI-Abyad et al, 1986). In this context, these growth regulators affect the morphology of plant roots and plant development in the same way as gibberellic and indole acetic acids (Brown, 1972(Brown, , 1974Brown et al, 1968). In this work, the significant improvement in tomato growth observed with the seedcoating treatment may be due to the increased availability to the tomato seeds of the growth regulators produced by the antagonistic actinomycetes together with their continuous supply to the developing plants as a result of the intimate contact between the seeds and the antagonist.…”

Section: Biocontrol Of Fungal and Bacterial Diseases 193mentioning

confidence: 99%

Towards the biological control of fungal and bacterial diseases of tomato using antagonistic Streptomyces spp.

et al. 1993

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This investigation was designed to explore the potential of microbial antagonism in the control of some tomato diseases including bacterial, Fusarium and Verticillium wilts; early blight; bacterial canker. Three Streptomyces spp. were used: S. pulcher, S. canescens and S. citreofluorescens.The in vitro studies showed that an 80% concentration of the culture filtrate of either S. pulcher or S. canescens significantly inhibited spore germination, mycelial growth and spotulation of Fusarium oxysporum f.sp. lycopersici, Verticillium albo-atrurn and Alternaria solani. The same concentration of filtrate of either S. pulcher or S. citreofluorescens was detrimental to the bacterial populations of Clavibacter michiganensis subsp, michiganensis and Pseudomonas solanacearum.The in vivo studies involved different treatments: soaking tomato seeds in filtrate of the antagonist prior to sowing, inoculation of the soil with the antagonist 7 days before sowing, and coating of tomato seeds with spores of the antagonist before sowing. The seed-coating treatment was the most effective in controlling all the pathogens at 42 and 63 days after sowing. Soil inoculation with the antagonist 7 days prior to sowing was less effective in controlling the tomato pathogens as compared to seed-coating. The seed-soaking treatment was the least effective in controlling the diseases concerned.The results also revealed that seed-coating with antagonistic Streptomyces spp. significantly improved tomato growth.

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Section: Biocontrol Of Fungal and Bacterial Diseases 193mentioning

confidence: 99%

Towards the biological control of fungal and bacterial diseases of tomato using antagonistic Streptomyces spp.

et al. 1993

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“…Increases in leaf number to flowering may not be indicative of delays in flower initiation since a possible effect of GA3 is to increase the rate of leaf initiation during the vegetative phase. Brown, Jackson and Burlingham (1968) found that treatment of plants with GA3 could produce an increase or decrease in the time between flower bud appearance and fruit set depending on the amount and method of application of the growth regulator. A difference in the time of flower opening can reflect an effect on the post-initiation development of the flowers rather than on the time of flower initiation.…”

Section: Duration Of the Vegetative Phasementioning

confidence: 99%

Flowering

Atherton¹,

Harris²

1986

The Tomato Crop

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“…Indirect studies have revealed similar plant responses upon treatment with phytohormones and inoculation with specific microorganisms (Azcon et al, 1978;Brown et al, 1968;Hubbell et al, 1979;. One of the first studies showing a direct effect of microbial TRP-derived auxins on plant growth was demonstrated with the inoculum, Pisolithus tinctorius on the growth of Douglas fir (Frankenberger and Poth, 1987a).…”

Section: Introductionmentioning

confidence: 99%

Response of Raphanus sativus to the auxin precursor, L-tryptophan applied to soil

1990

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Soil microorganisms are capable of producing auxins in the presence of the physiological precursor, L-tryptophan (L-TRP). This study was designed to assess the influence of L-TRP on radish (Raphanus sativus) yield when applied to soil. The amount of L-TRP added to soil to give optimum radish growth in glasshouse studies was 3.0 mg kg -1 soil which enhanced the root yield by 1.31-fold over the control. The root/shoot ratio was increased by 1.10-fold upon this amendment. One L-TRP application was sufficient to promote growth. The best time to apply L-TRP was at the onset of seedling emergence. The application of L-TRP promoted radish yield comparable to those plants treated with indole-3-acetic acid, indole-3-acetamide and indole-3-1actic acid. Foliar application of L-TRP had no effect on the root and shoot dry weight. A field study was conducted in which L-TRP applications at a rate of 20.4 and 204 mg m -2 significantly enhanced the radish yield in fertilized plots receiving fertilization. The shoot dry weight was increased by 1.29-fold and the root dry weight by 1.15-fold over the control in response to 20.4mg L-TRP m -2. These findings indicate that L-TRP, applied at the appropriate times and concentrations, can increase radish yield. The effect of L-TRP on radish growth could be attributed to i) substrate-dependent auxin production in soil by the indigenous microflora, ii) uptake directly by plant roots followed by metabolism within their tissues, and/or iii) a change in the balance of rhizosphere microflora affecting plant growth.

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Effects Produced on Tomato Plants,Lycopersicum esculentum, by Seed or Root Treatment with Gibberellic Acid and Indol-3yl-Acetic Acid

Cited by 24 publications

References 6 publications

Towards the biological control of fungal and bacterial diseases of tomato using antagonistic Streptomyces spp.

Towards the biological control of fungal and bacterial diseases of tomato using antagonistic Streptomyces spp.

Flowering

Response of Raphanus sativus to the auxin precursor, L-tryptophan applied to soil

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