Stimulation of indoleacetic acid production in a Rhizobium isolate of Vigna mungo by root nodule phenolic acids

The indoleacetic acid produced by symbiotic bacteria is an important phytohormone signaling microbe-plant interaction, being therefore essential for rhizoremediation. In this study, the effect of different concentrations of copper ions on the bacterial growth and indoleacetic acid production was investigated in two strains of Mesorhizobium loti in in vitro conditions, aiming to determine critical concentrations of this heavy metal for rhizoremediation of contaminated soils using this bacterium. The experiment consisted on a control culture without copper and three treatments supplemented with 10 mg.L-1, 20 mg.L-1 or 50 mg.L-1 of CuSO4. For both strains, the growth stopped after 48h and no significant difference was observed across treatments. The production of indoleacetic acid by the control treatment without copper was significantly higher in comparison to the copper- containing treatments. Mesorhizobium loti SEMIA806 and SEMIA816 are resistant to up to 50 mg.L-1 of CuSO4 in the culture medium, presenting effective growth. The synthesis of indoleacetic acid was strongly reduced but not excluded by ions copper in the medium. So, it is expected that environmental copper found in the soil up to the concentration of 50 mg.L-1 will not preclude the symbiotic interaction between M. loti and leguminous host plant in rhizoremediation enterprises.

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Prostaglandin E2-histamine in interactions on cAMP, cGMP, and acid production in isolated fundic glands

AJP Gastrointestinal and Liver Physiology ◽

10.1152/ajpgi.1982.242.1.g21 ◽

1982 ◽

Vol 242 (1) ◽

pp. G21-G26 ◽

Cited By ~ 1

Author(s):

R. A. Levine ◽

K. R. Kohen ◽

E. H. Schwartzel ◽

C. E. Ramsay

Keyword(s):

Prostaglandin E2 ◽

Acid Secretion ◽

Acid Production ◽

Camp Production ◽

Histamine Stimulation ◽

Fundic Mucosa ◽

Biochemical Responses ◽

Camp Levels ◽

Camp And Cgmp ◽

Stimulation Of

Relations among cAMP, cGMP, acid production [measured by the intraglandular accumulation of [14C]aminopyrine (AP)], and prostaglandin E2 (PGE2) activity were studied in isolated glands from rabbit fundic mucosa. AP, cAMP, and cGMP responses to histamine, PGE2, and 3-isobutyl-1-methylxanthine (IMX) were compared with controls. Histamine and PGE2 significantly increased glandular cAMP levels twofold, and histamine and IMX stimulated AP uptake two- to fourfold. PGE2 significantly inhibited both histamine- and IMX-stimulated AP accumulation, but it did not alter basal AP uptake. PGE2 also decreased histamine-stimulated cAMP production but only at a low concentration (10(-7) M). This dose of PGE2 was near to the endogenous PGE2 content found in unstimulated glands (10(-8) M). Intraglandular cGMP levels in unstimulated glands (10(-8) M). Intraglandular cGMP levels were increased by IMX but not by PGE2 or histamine. It is concluded that histamine stimulation of acid secretion is mediated by cAMP, that secretory and biochemical responses to histamine are modulated by PGE2 because PGE2 antagonized histamine-stimulated cAMP and AP uptake, and that the rise in cAMP induced solely by PGE2 appears to be localized within nonparietal cells because PGE2 alone did not stimulate AP accumulation.

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THE INDOLEACETIC ACID CONTENT OF ROOT NODULES AND ROOTS OF CYCAS CIRCINALIS L. WITH REGARD TO OTHER ROOT-NODULE SYSTEMS

Acta Botanica Neerlandica ◽

10.1111/j.1438-8677.1968.tb00558.x ◽

1968 ◽

Vol 17 (6) ◽

pp. 496-498 ◽

Cited By ~ 5

Author(s):

J. Dullaart

Keyword(s):

Acid Content ◽

Root Nodule ◽

Indoleacetic Acid ◽

Root Nodules ◽

Cycas Circinalis

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The Genetics of Indoleacetic Acid Production and Virulence in Pseudomonas savastanoi

Proceedings in Life Sciences - Molecular Genetics of the Bacteria-Plant Interaction ◽

10.1007/978-3-642-69338-0_41 ◽

1983 ◽

pp. 362-366 ◽

Cited By ~ 4

Author(s):

L. Comai ◽

T. Kosuge

Keyword(s):

Acid Production ◽

Indoleacetic Acid

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Ascorbic Acid Stimulation of Diacetyl Production in Mixed-Strain Lactic Acid Cultures

Journal of Food Protection ◽

10.4315/0362-028x-42.4.294 ◽

1979 ◽

Vol 42 (4) ◽

pp. 294-296 ◽

Cited By ~ 5

Author(s):

R. L. RICHTER ◽

W. S. BRANK ◽

C. W. DILL ◽

C. A. WATTS

Keyword(s):

Ascorbic Acid ◽

Lactic Acid ◽

Acid Production ◽

Sodium Citrate ◽

Total Solids ◽

Dry Milk ◽

Nonfat Dry Milk ◽

Stimulation Of

The effect of three levels of ascorbic acid on diacetyl and acid production by two mixed-strain cultures was investigated. Each culture was grown in nonfat dry milk reconstituted to 11% total solids with 0.1% added sodium citrate. Ascorbic acid concentrations in the milk were 0, 0.10, and 0.25%. Stimulation of diacetyl production was observed at both concentrations of ascorbic acid. The stimulatory effect of ascorbic acid at both concentrations was approximately the same for each culture. Diacetyl production was initiated earlier in samples containing ascorbic acid. Ascorbic acid did not stimulate acid production.

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Stimulation of Lactic Acid Production in Vitro from Prepubertal Rat Ovaries by Gonadotropins and Their Subunits1

Endocrinology ◽

10.1210/endo-92-4-1022 ◽

1973 ◽

Vol 92 (4) ◽

pp. 1022-1027 ◽

Cited By ~ 12

Author(s):

SUSAN WALKER FARMER ◽

M. R. SAIRAM ◽

HAROLD PAPKOFF

Keyword(s):

Lactic Acid ◽

Acid Production ◽

Lactic Acid Production ◽

Stimulation Of

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CHEMICAL EFFECTS ON ANTHOCYANIN BIOSYNTHESIS IN STORED CRANBERRIES

Canadian Journal of Plant Science ◽

10.4141/cjps70-126 ◽

1970 ◽

Vol 50 (6) ◽

pp. 673-677 ◽

Cited By ~ 4

Author(s):

P. E. CANSFIELD ◽

F. J. FRANCIS

Keyword(s):

Indoleacetic Acid ◽

Anthocyanin Biosynthesis ◽

Pigment Production ◽

Consumer Acceptance ◽

Anthocyanin Pigment ◽

Total Pigment ◽

Chemical Effects ◽

M 10 ◽

Pigment Contents ◽

Stimulation Of

Infiltration of pale colored cranberries with gibberellic acid (10−4M, 10−5M), malathion (0.38 × 10−4M), indoleacetic acid (10−6M) and galactose (10−2M) stimulated the development of anthocyanin pigment. Galactose (0.5 × 10−1M, 0.25 × 10−1M) and sucrose (10−1M, 0.5 × 10−1M, 0.25 × 10−1M) inhibited pigment production. The experimental berries all had much lower total pigment contents than well colored, vine-ripened berries. The ratios of the four main pigments were also different. The stimulation of pigment production was not great enough to influence consumer acceptance. However, the results were sufficiently encouraging to suggest that further experiments were justified.

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