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61.
Organic acids, sugars, and L-tryptophane in exudates of vegetables growing on stonewool and their effects on activities of rhizosphere bacteria 总被引:3,自引:0,他引:3
Kamilova F Kravchenko LV Shaposhnikov AI Azarova T Makarova N Lugtenberg B 《Molecular plant-microbe interactions : MPMI》2006,19(3):250-256
The influence of stonewool substrate on the exudation of the major soluble carbon nutrients and of the auxin precursor tryptophane for Pseudomonas biocontrol agents was studied. To this end, the composition of the organic acids and sugars, as well that of tryptophane, of axenically collected exudates of seed, seedlings, and roots of tomato, cucumber, and sweet pepper was determined. The major results were as follows. i) The total amount of organic acid is much higher than that of total sugar. ii) Exudation of both organic acids and sugars increases during plant growth. iii) Citric, succinic, and malic acids represent the major organic acids, whereas fructose and glucose are the major sugars. iv) Compared with glass beads as a neutral substrate, stonewool substantially stimulates exudation of organic acids and sugars. v) It appeared that enhanced root-tip-colonizing bacteria isolated previously from the rhizosphere of tomato and cucumber grow much better in minimal medium with citrate as the sole carbon source than other, randomly selected rhizobacteria do. This indicates that the procedure which selects for excellent root-tip colonizers enriches for strains which utilize the major exudate carbon source citrate. vi) The content of L-tryptophane, the direct precursor of auxin, is approximately 60-fold higher in seedling exudates of tomato and sweet pepper than in cucumber seedling exudates, indicating a higher possibility of plant growth stimulation after inoculation with auxin-producing rhizobacteria for tomato and sweet pepper crops than for cucumber. However, the biocontrol strain Pseudomonas fluorescens WCS365, which is able to convert tryptophane into auxin, did not stimulate growth of these three crops. In contrast, this strain did stimulate growth of roots of radish, a plant which exudes nine times more tryptophane than tomato does. 相似文献
62.
We studied the effect of He–Ne laser on regeneration of damaged gastrocnemius muscle in rats irradiated at 6 Gy in conditions of fractional laser energy spread (10 exposures, 3 min for each limb, within 30 days after the operation; 2–3 exposures weekly; 2.5–3.0 mW/cm2 power density; and 9.0–10.8 J/cm2 total dose per animal). Laser radiation stimulated regenerative activity of the skeletal muscle and favored a more even distribution of load on the thymus (a smooth decrease in its weight and slow aplasia). The level of chromosomal aberrations in the thymocytes demonstrated certain instability although remained lower as compared to the control during the whole observation period (60 days). 相似文献
63.
Zubkova SM Buliakova NV Mikhaĭlik LV Varakina NI Azarova VS 《Radiatsionnaia biologiia, radioecologiia / Rossi?skaia akademiia nauk》2002,42(3):315-321
Using biochemical, histological, morphometric and cytogenetic methods, it was shown that low-intensive infrared laser radiation (total dose 3.6 J/cm2), applied to the injured rat skeletal muscles, stimulated metabolism and regeneration more efficiently in the muscles locally exposed to 20 Gy X-rays compared to the unexposed muscles. The laser irradiation promoted postradiative recovery in bone marrow cells, but did not provide normalization in thymus lymphocyte activity. 相似文献
64.
Some bacterial strains isolated from the plant rhizosphere showed high root-colonizing ability and antiphytopathogenic activity against 6 fungal species. The antifungal activity was species-specific, which could be accounted for by the fact that the isolates differed in the ability to produce lytic enzymes (chitinases, proteases, and lipases) and to secrete cyanide. The possibility of using there rhizobacteria to control phytopathogens is discussed. 相似文献
65.
Iuliia Pavlyk Nicolae A. Leu Pavan Vedula Satoshi Kurosaka Anna Kashina 《Traffic (Copenhagen, Denmark)》2018,19(4):263-272
β‐actin plays key roles in cell migration. Our previous work demonstrated that β‐actin in migratory non‐muscle cells is N‐terminally arginylated and that this arginylation is required for normal lamellipodia extension. Here, we examined the function of β‐actin arginylation in cell migration. We found that arginylated β‐actin is concentrated at the leading edge of lamellipodia and that this enrichment is abolished after serum starvation as well as in contact‐inhibited cells in confluent cultures, suggesting that arginylated β‐actin at the cell leading edge is coupled to active migration. Arginylated actin levels exhibit dynamic changes in response to cell stimuli, lowered after serum starvation and dramatically elevating within minutes after cell stimulation by readdition of serum or lysophosphatidic acid. These dynamic changes require active translation and are not seen in confluent contact‐inhibited cell cultures. Microinjection of arginylated actin antibodies into cells severely and specifically inhibits their migration rates. Together, these data strongly suggest that arginylation of β‐actin is a tightly regulated dynamic process that occurs at the leading edge of locomoting cells in response to stimuli and is integral to the signaling network that regulates cell migration. 相似文献
66.
It is well known that estrogens and estrogen-like endocrine disruptors can suppress steroidogenic gene expression, attenuate androgen production and decrease differentiation of adult Leydig cell lineage. However, there is no information about the possible link between the potency of Leydig cells to produce androgens and their sensitivity to estrogenic stimuli. Thus, the present study explored the relationship between androgen production potential of Leydig cells and their responsiveness to estrogenic compounds. To investigate this relationship we selected mouse genotypes contrasting in sex hormone levels and differing in testosterone/estradiol (T/E2) ratio. We found that two mouse genotypes, CBA/Lac and C57BL/6j have the highest and the lowest serum T/E2 ratio associated with increased serum LH level in C57BL/6j compared to CBA/Lac. Analysis of steroidogenic gene expression demonstrated significant upregulation of Cyp19 gene expression but coordinated suppression of LHR, StAR, 3βHSDI and Cyp17a1 in Leydig cells from C57BL/6j that was associated with attenuated androgen production in basal and hCG-stimulated conditions compared to CBA/Lac mice. These genotype-dependent differences in steroidogenesis were not linked to changes in the expression of estrogen receptors ERα and Gpr30, while ERβ expression was attenuated in Leydig cells from C57BL/6j compared to CBA/Lac. No effects of estrogenic agonists on steroidogenesis in Leydig cells from both genotypes were found. In contrast, xenoestrogen bisphenol A significantly potentiated hCG-activated androgen production by Leydig cells from C57BL/6j and CBA/Lac mice by suppressing conversion of testosterone into corresponding metabolite 5α-androstane-3α,17β-diol. All together our data indicate that developing mouse Leydig cells with different androgen production potential are resistant to estrogenic stimuli, while xenoestrogen BPA facilitates hCG-induced steroidogenesis in mouse Leydig cells via attenuation of testosterone metabolism. This cellular event can cause premature maturation of Leydig cells that may create abnormal intratesticular paracrine milieu and disturb proper development of germ cells. 相似文献
67.
Azarova I. N. Parfenova V. V. Baram G. I. Terkina I. A. Pavlova O. N. Suslova M. Yu. 《Applied Biochemistry and Microbiology》2003,39(6):585-589
Degradation of bis-(2-ethylhexyl)phthalate (BEHP) by microbial associations of the water and bottom sediments of the Selenga River and Lake Baikal and by pure cultures of microbial species belonging to various taxa isolated from the sediments under discussion is studied. It is shown that intense biological degradation occurs in both water and sediments. The degrees of conversion in closed experimental systems on minimal media are 46 and 24%, respectively. The most active of the organisms studied is a Micromironospora actinomycete. It degraded BEHP by 36% of its initial concentration. Spore-forming bacteria and microorganisms of the genus Pseudomonas were less active (17–23% and 7–11%). 相似文献
68.
Root Exudates of Tomato Plants and Their Effect on the Growth and Antifungal Activity of Pseudomonas Strains 总被引:2,自引:0,他引:2
Kravchenko L. V. Azarova T. S. Leonova-Erko E. I. Shaposhnikov A. I. Makarova N. M. Tikhonovich I. A. 《Microbiology》2003,72(1):37-41
The study of the effect of the root exometabolites of tomato plants on the growth and antifungal activity of plant growth–promoting Pseudomonas strains showed that the antifungal activity of plant growth–promoting rhizobacteria in the plant rhizosphere may depend on the sugar and organic acid composition of root exudates. 相似文献
69.
Kravchenko L. V. Makarova N. M. Azarova T. S. Provorov N. A. Tikhonovich I. A. 《Microbiology》2002,71(4):444-448
Some bacterial strains isolated from the plant rhizosphere showed high root-colonizing ability and antiphytopathogenic activity against 6 fungal species. The antifungal activity was species-specific, which could be accounted for by the fact that the isolates differed in the ability to produce lytic enzymes (chitinases, proteases, and lipases) and to secrete cyanide. The possibility of using there rhizobacteria to control phytopathogens is discussed. 相似文献
70.
Iuliia Khomenko Irene Stefanini Luca Cappellin Valentina Cappelletti Pietro Franceschi Duccio Cavalieri Tilmann D. Märk Franco Biasioli 《Metabolomics : Official journal of the Metabolomic Society》2017,13(10):118