Azospirillum sp. Promotes Root Hair Development in Tomato Plants through a Mechanism that Involves Ethylene

Ribaudo, Cristina; Krumpholz, Evelyn M.; Cassán, Fabricio; Bottini, Rubén; Cantore, María L.; Curá, José A.

doi:10.1007/s00344-005-0128-5

Cited by 111 publications

(58 citation statements)

References 36 publications

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“…This was particularly demonstrated with Sp7 and Sp245 when inoculated by soaking, and Sp7 inoculation by drenching. This result somehow contradicts to the previous findings of Ribaudo et al (2006) who reported enhancement of IAA content of tomato shoots and roots due to A. brasilense FT 326 inoculation. However in cucumber, the level of endogenous IAA increased …”

Section: Effects Of Inoculation On the Level Of Endogenous Iaacontrasting

confidence: 99%

Early seedling growth response of lettuce, tomato and cucumber to Azospirillum brasilense inoculated by soaking and drenching

Mangmang

Deaker

Rogers

2015

Hort. Sci. (Prague)

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Mangmang J.S., Deaker R., Rogers G. (2015): Early seedling growth response of lettuce, tomato and cucumber to Azospirillum brasilense inoculated by soaking and drenching. Hort. Sci. (Prague), 42: 37-46.This study evaluated the effects of three A. brasilense strains (i.e. Sp7, Sp7-S and Sp245) on the early seedling growth of lettuce, tomato and cucumber. Seeds were inoculated by soaking and drenching before and after sowing, respectively. Results show that inoculation effect varied greatly with plant species, inoculation methods and PGPR strains which could be dependent on inoculum concentration and IAA (indole-3-acetic acid) production. Generally, the magnitude of inoculation impact on the early growth of vegetables was more pronounced with Sp7-S, followed by Sp245 and Sp7. In particular, Sp7-S and Sp245 strongly enhanced root and shoot growth, germination value and vigour of tomato when inoculated by soaking. Sp245 increased the level of endogenous plant IAA of cucumber and lettuce. Despite the diverse crop responses to inoculation methods, soaking appeared to be a better technique, and majority of the strains demonstrated more consistent beneficial effects on tomato.

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Section: Effects Of Inoculation On the Level Of Endogenous Iaacontrasting

confidence: 99%

Early seedling growth response of lettuce, tomato and cucumber to Azospirillum brasilense inoculated by soaking and drenching

Mangmang

Deaker

Rogers

2015

Hort. Sci. (Prague)

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“…(Boiero et al, 2007). Ribaudo et al (2006) represented some of the efficient PGPR strains as the producer of different plant growth regulators. IAA-mediated ethylene production could increase root biomass, root hair number and consequently the root surface area of PGPR inoculated tomato plants.…”

Section: Plant Growth Promoting Rhizobacteriamentioning

confidence: 99%

Plant growth promoting rhizobacteria and their potential for biocontrol of phytopathogens

Ramadan¹,

Abdel-Hafez²,

Hassan³

et al. 2016

Afr. J. Microbiol. Res.

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Growth promotion and disease control by rhizobacteria are complex interrelated processes that involve direct and indirect mechanisms. The mechanisms include synthesis of some metabolites (auxin, cytokinin and gibberellins), induction of 1-aminocyclopropane-1-carboxylate (ACC) deaminase, production of siderophore, antibiotics, hydrogen cyanide hydrogen cyanide (HCN) and volatile compounds. They also include mineral solubilization competition, and induction of systemic resistance. These bacteria are suitable as soil inoculants because they have the potential for rapid and aggressive colonization. This feature alone is characterised as a disease control mechanism, which prevents the invasion of detrimental soil microorganisms onto the root surface. Inoculant-based plant growthpromoting rhizobacteria (PGPR) is applied extensively on agricultural crops to improve plants' growth and simultaneously reduce chemical inputs like fertilizer and pesticide which can cause environmental degradation. The structure of the rhizobacterial community is affected by several factors including plant genotype and is determined by the amount and composition of root exudates. In addition, soil type and fertility are the contributing factors that shape the community. This form of communication can affect plants' growth, nutrient status and also susceptibility to stress and pathogens in the host plant. PGPR inoculants cause diverse beneficial interactions among plants, which leads to sustainable and environment-friendly agriculture. The application of rhizosphere soil of agricultural crops with desirable bacterial populations is considered promising in both laboratory and greenhouse experiment. Further, a clearer understanding of the way PGPRs promote plants' growth can lead to expanded exploitation of these 'biofertilizers' in order to reduce the potential negative environmental effects associated with food and fiber production.

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“…PGPR have also been found to control or minimize phytopathogenic effects through niche competition, antibiosis and systemic resistance induction (Sturz & Christie, 2003;Zhou et al, 2015). Inoculation with Azospirillum brasilense FT 326 was shown to increase the tomato shoot and root fresh weight, main root-hair length and root surface area, thereby resulting in improved plant growth (Ribaudo et al, 2006). In contrast, pathogenic microorganisms could inhibit root growth by damaging beneficial microbes, secreting toxins and infecting the root system.…”

Section: Effects Of Inoculation With Rhizobacteria On Root Respiratormentioning

confidence: 99%

Effects of rhizobacteria on the respiration and growth of Cerasus sachalinensis Kom. seedlings

Qin

Zhou

et al. 2016

Span. j. agric. res.

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In this study, we investigated the influence of rhizosphere microorganisms on seed germination and root metabolism in Cerasus sachalinensis Kom. We inoculated C. sachalinensis plants with suspensions of dominant bacterial strains isolated from their rhizosphere. Four bacterial strains each with significant growth-promoting or growth-inhibiting effects were screened from the efficient root-colonizing microorganisms. The number of actinomycetes increased and that of fungi decreased significantly in the seedling rhizospheres after rhizobacteria treatment. The growth-promoting bacteria slightly affected the respiration rates and respiratory pathway enzymes, but significantly improved root viability, root carbohydrate concentration and seedling growth. Bacillus cereus, Staphylococcus sp. and Pseudomonas fluorescens were identified as the growth-promoting rhizobacteria; one strain could not be identified. After inoculation with the growth-inhibiting bacteria, the number of fungal colonies in the seedling rhizospheres increased and root viability and respiration rate as well as starch and sucrose accumulation in the roots significantly decreased. The glycolysis, pentose phosphate and alternative oxidase pathways became the major pathways of respiratory metabolism after inoculation with the growth-inhibiting bacteria. The height, leaf number, growth and dry weight of the seedlings decreased significantly in plants inoculated with the growth-inhibiting bacteria. Inoculation of C. sachalinensis rhizosphere with growth-promoting and growth-inhibiting bacteria affected the soil environmental factors such as microbial group composition, nutrient concentration and seedling biomass.

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Azospirillum sp. Promotes Root Hair Development in Tomato Plants through a Mechanism that Involves Ethylene

Cited by 111 publications

References 36 publications

Early seedling growth response of lettuce, tomato and cucumber to Azospirillum brasilense inoculated by soaking and drenching

Early seedling growth response of lettuce, tomato and cucumber to Azospirillum brasilense inoculated by soaking and drenching

Plant growth promoting rhizobacteria and their potential for biocontrol of phytopathogens

Effects of rhizobacteria on the respiration and growth of Cerasus sachalinensis Kom. seedlings

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