Kinetin-induced Changes in the Population of Translable Messenger RNA in Cucumber Cotyledons

Legocka, Jolanta

doi:10.1016/s0015-3796(87)80060-4

Cited by 7 publications

(3 citation statements)

References 28 publications

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“…The main effects are mainly stimulations of cell division and chloroplast development, of differentiation processes, of expression of photosynthetic genes, of syntheses of DNA, RNA, proteins, enzymes of carbon fixation, components of electron transport chain (plastoquinone, P 700), carbonic anhydrase, chloroplast pigments and enzymes of their synthetic pathways, of activities of photosystems, non-cyclic and cyclic photophosphorylation and ATPase, which result in a stimulation of net photosynthetic rate, modification of respiratory activities and an increase in leaf area and biomass formation (e.g. Legocka 1989, Vafikov~i et al 1991 1992, Gutra and Sabater 1992, for further references see the annual bibliographies -~estfk and (~atslr 1974-1991). The pattern of the response to cytokinin application varies with environmental factors (temperature, irradiance, water supply), and with the age of leaf or plant as cytokinins enhance juvenile characteristics and retard degradative processes, e.g.…”

Section: Introductionmentioning

confidence: 99%

High level of endogenous cytokinins in transgenic potato plantlets limits photosynthesis

Čatský¹,

Pospíšilová²,

Macháčková³

et al. 1993

Biol. plant.

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Introduction of the gene for cytokinin synthesis into potato genome lead to a manifold increase in the level of cytokinins (zeatin, zeatin riboside, isopentenyladenine, isopentenyladenosine) in plantlets grown in vitro. The increasing cytokinin level was associated with increasing tendency to teratoma formation, to decreasing leaf net photosynthetic rate and to increasing dark and light respiration rates and CO 2 compensation concentration. During plantlet (or teratoma) ontogeny, net photosynthetic rate increased simultaneously with the decrease in cytokinin level. High level of endogenous cytokinins was associated also with lower photochemical activities of both photosystems in isolated chloroplasts.

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Section: Introductionmentioning

confidence: 99%

High level of endogenous cytokinins in transgenic potato plantlets limits photosynthesis

Čatský¹,

Pospíšilová²,

Macháčková³

et al. 1993

Biol. plant.

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“…This can be due to enhancement, induction or repression of specific nuclear genes as visualized by their mRNA products. Such selectivity in protein synthesis was claimed by several authors (Seyer and Lescure, 1984;Chen and Leisner, 1985;Legocka, 1987), whereas the bulk of proteins was found to remain unaffected. The alternative would be a collective stimulation of synthesis of the cytoplasmic polypeptides in response to the two factors.…”

mentioning

confidence: 59%

Cytokinin, Light, and “Developmental Control” of Protein Synthesis in Cucurbita Cotyledons

Wollgiehn

et al. 1988

Botanica Acta

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Cotyledons detached from pumpkin seedlings of different stages of development were either illuminated or treated with 4.10−5 M cytokinin (benzyladenine, BA) in darkness. Comparison of the abilities to incorporate 14C‐leucine into proteins in vivo as well as 35S‐methionine in vitro by means of an RNA‐programmed cell‐free wheat germ system demonstrates that the patterns of the two‐dimensionally separated in vivo labelled soluble proteins are very similar in differently developed or treated cotyledons. Although the translatable mRNA patterns were almost identical in qualitative respect, our data do not exclude the appearance of a few minor polypeptides altered by either illumination or BA treatment. The steady‐state levels of the mRNAs in cotyledons from 12 days old seedlings were remarkably similar irrespective of cotyledon treatment (water, BA, light) and resemble those levels obtained with illuminated or BA‐treated cotyledons of earlier seedlings stages. Our results suggest that the amount of abundant (soluble) proteins in pumpkin cotyledons is developmentally regulated mainly at the transcript level. Extrinsic factors such as cytokinins (BA) or light are equally able to accelerate the developmental program of gene expression in early‐detached cotyledons, which are probably deficient in endogenous hormone.

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“…Furthermore, yeast via its cytokinins content (Skoog and Miller, 1957) might be play a role in orientation and translocation of metabolites from leaves into the reproductive organs (Savenkova, 1984). Also it might be play a role in the synthesis of protein and nucleic acids and minimized their degradation (Legocka, 1987). All of these occurrences and attributes might lead to the improvement of strawberry yield.…”

Section: Discussionmentioning

confidence: 99%

Physiological Response of Strawberry Grown in Root- Knot Nematode Infested Soil Under Different Safety Control Applications

Mahdy

Midan

2011

Arab Universities Journal of Agricultural Sciences

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Two successive field experiments during two seasons of 2008 and 2009, were carried out to evaluate some safety treatments including: mulching, tunnels, natural yeast extract, antioxidant and two rhizobacteria Serratia marcescens and Pseudomonas fluorescens towards root-knot nematode Meloidogyne spp. on strawberry plant grown in naturally infested soil and consequently their probable effects on growth parameters, chemical components and yield of strawberry compared to untreated control. Results of this study confirmed that all used treatments, significantly reduced all related nematode parameters i.e. number of galls/root system; number of egg masses/root system as well as number of juveniles/250 g soil ﴾either after 2 or 4 months﴿ when compared to plants grown in the naturally infested soil only. The highest percentage of reduction in all related nematode parameters were noticed after 4 months. Mulching, S. marcescens, P. fluorescens and tunnels, played an important role in reducing the percentage of nematode parameters. Mulching and S. marcescens reduced the percentage of gall numbers/root system by 77%, followed by tunnels by 75% and P. fluorescens by 70%. S. marcescens reduced the percentage of egg masses/root system by 80% followed by P. fluorescens by 78% and mulching by 76%. Results indicated that the soil treated with mulching, also significantly reduced the percentage of juvenile numbers/250 g soil by 79% followed by S. marcescens by 73%. Results confirmed also that all used treatments significantly increased all related plant growth characters viz. leaves, stems, root fresh and dry weight; plant height, leaves number, root length as well as false stem length. Moreover, these treatments significantly increased the activity of some oxidative enzymes e.g. peroxidase and phenoloxidase as well as some other chemical components i.e. total soluble solids (T.S.S %) and vitamin C (V.C). Results revealed that all previous treatments significantly increased the early and total yield. Our results confirmed that, the rhizobacterium S. marcescens came in the first rank as a promoter of all related plant growth characters, followed by tunnels and mulching treatments. Results confirmed that also the antioxidants, are considered the effective one in enhancing the activities of peroxidase and phenoloxidase as well as T.S.S% and V.C followed by the natural yeast extract.

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Kinetin-induced Changes in the Population of Translable Messenger RNA in Cucumber Cotyledons

Cited by 7 publications

References 28 publications

High level of endogenous cytokinins in transgenic potato plantlets limits photosynthesis

High level of endogenous cytokinins in transgenic potato plantlets limits photosynthesis

Cytokinin, Light, and “Developmental Control” of Protein Synthesis in Cucurbita Cotyledons

Physiological Response of Strawberry Grown in Root- Knot Nematode Infested Soil Under Different Safety Control Applications

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