Seed and Root Bacterization

Brown, Michael

doi:10.1146/annurev.py.12.090174.001145

Cited by 387 publications

(133 citation statements)

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“…Our approach for studying growth promotion is to produce nonpromoting mutants (isogenic to the parental strain) by Tn5 transposon mutagenesis. This course of action has been suggested by a number of investigators (3,6,7). We have now obtained five mutant strains with altered growth promoting capabilities and are in the process of characterizing the DNA regions responsible for encoding growth stimulation.…”

Section: Discussionmentioning

confidence: 84%

“…Hormonal effects, however, are complex and, often, specific responses result not from a single hormone but from the balance of several (28). Other investigators have encountered similar difficulties in demonstrating hormonal regulation or production as a mechanism of growth promotion, and the evidence remains mostly circumstantial (3,7,14,23). Our approach for studying growth promotion is to produce nonpromoting mutants (isogenic to the parental strain) by Tn5 transposon mutagenesis.…”

Section: Discussionmentioning

confidence: 99%

“…Many Pseudomonas species, particularly those belonging to the fluorescent group (7,9), enhance plant growth and crop yield under greenhouse and field conditions (10,20). The mechanisms involved in growth stimulation by these PGPR3 have not been fully explained.…”

mentioning

confidence: 99%

“…The mechanisms involved in growth stimulation by these PGPR3 have not been fully explained. In the genus Pseudomonas, site competition (2,7,10), increased phosphate uptake (19), synthesis of plant growth promoting substances (6,14), and antagonisms through production of antibiotics and siderophores (7,9) have been shown to be involved. In most 'This study was partially supported by grants from the National Science and Engineering Research Council of Canada (STRIN039) and the Ontario Ministry of Agriculture and Food.…”

mentioning

confidence: 99%

“…instances, however, growth stimulation is an indirect effect of reduced disease incidence, as many PGPR are antagonistic to plant pathogens (2,7,9). Surprisingly, few attempts have been made to determine the influence of PGPR on plant growth under gnotobiotic conditions offering a true measure of the bacterial effects on plant growth and differentiation.…”

mentioning

confidence: 99%

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Growth Enhancement and Developmental Modifications of in Vitro Grown Potato (Solanum tuberosum spp. tuberosum) as Affected by a Nonfluorescent Pseudomonas sp.

Frommel¹,

Nowak²,

Lazarovits³

1991

Plant Physiol.

212

118

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A plant growth-promoting rhizobactenum, designated Ps JN and isolated from onion roots, was identified as a nonfluorescent Pseudomonas sp. The percentage of similarity of Ps JN to P.gladioli (NCPPB 1891), P. ckhordi (NCPPB 943), and P. viridiflava (NCPPB 635), as determined from 135 biochemical and physiological tests was 77, 70, and 66%, respectively. Ps JN persisted through successive generations of in vitro cultured potato plantlets, both as endophytic and epiphytic populations. In vitro inoculated potato (Solanum tuberosum) nodal explants produced plantlets with significant increases in root number (24-196%), root dry weight (44-201%), haulm dry weight (14-151%), and stem length (26-28%) as compared with noninoculated control plants. Bacterization also enhanced leaf hair formation (55-110%), secondary root branching, and total plant lignin content (43%). Other root colonizing bacteria or heat-killed cells of Ps JN had no significant effect on plant growth. Detached leaves from in vitro grown control plants, when exposed to 190C and 50% relative humidity, lost 55% of their moisture content in 2.5 hours.Moisture loss by leaves of in vitro grown, bacterized plants, as well as greenhouse-acclimated, bacterized plants, and control plants, was less than 20%. Changes in stomatal closure appear to account for this difference.

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Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Growth Enhancement and Developmental Modifications of in Vitro Grown Potato (Solanum tuberosum spp. tuberosum) as Affected by a Nonfluorescent Pseudomonas sp.

Frommel¹,

Nowak²,

Lazarovits³

1991

Plant Physiol.

212

118

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Improvement of seed quality and field emergence ofFusarium moniliforme infected sorghum seeds using biological agents

Raju

Niranjana

Janardhana

et al. 1999

J. Sci. Food Agric.

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Transfer of the Gene Encoding the NapA Acid Phosphatase ofMorganella morganii to aBurkholderia cepacia Strain

2001

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A composite plasmid was constructed using the broad-host-range vector pRK293 and the plasmid pPM9, the latter one harbouring a gene encoding the Nap A acid phosphatase from M. morganii. The recombinant construction was transformed and expressed in E. coli MC1061. Transformant clones were selected and characterized, showing that the relative orientation of both original plasmids with respect to each other affected the expression of the gene, with one of the plasmids (pT4) expressing significantly lower values of activity than the opposite orientation construction (pT5). Zymograms developed to detect acid phosphatase activity also corroborated the gene expression in the E. coli host. The genetic constructions (pT4 and pT5) were transferred to B. cepacia IS-16 by conjugation. The same effect of the original plasmid orientation in the construction was corroborated in the B. cepacia IS-16 strain. Compared with the strain lacking the recombinant plasmid, no significant improvement of cell-bound enzymatic activity was achieved by the exconjugant harbouring pT5. However, a significant increase in the extracellular enzyme activity was detected in the recombinant strains. No metabolic load due to the presence of the recombinant plasmid was detected in both E. coli and Burkholderia hosts.

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Seed and Root Bacterization

Cited by 387 publications

References 0 publications

Growth Enhancement and Developmental Modifications of in Vitro Grown Potato (Solanum tuberosum spp. tuberosum) as Affected by a Nonfluorescent Pseudomonas sp.

Growth Enhancement and Developmental Modifications of in Vitro Grown Potato (Solanum tuberosum spp. tuberosum) as Affected by a Nonfluorescent Pseudomonas sp.

Improvement of seed quality and field emergence ofFusarium moniliforme infected sorghum seeds using biological agents

Transfer of the Gene Encoding the NapA Acid Phosphatase ofMorganella morganii to aBurkholderia cepacia Strain

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