Effect of Cytokinins and Antibiotics on Chloroplast Development in Cotyledons of Cucumis sativus

Woźny, Adam; Szweykowska, A.

doi:10.1016/s0015-3796(17)30117-8

Cited by 22 publications

(5 citation statements)

References 31 publications

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“…For example, the prolonged growth on b.t. medium, which contains the cytokinin 6benzylaminopurine, could induce increased tolerance to CAP, as was found in whole plants, where cytokinins did reduce the cytotoxic effects of CAP and other bleaching agents (Wozny & Szweykowska, 1975). A similar difference between shoots and calli cultures of tobacco in their tolerance to cycloheximide was reported by Maliga and co-workers (1977), who attributed the increased tolerance of the shoots to activation of genes involved in cycloheximide degradation.…”

Section: Discussionsupporting

confidence: 66%

Sensitivity of tobacco tissue cultures to chloramphenicol and its photodegradation products

Barg

Umiel

Nitzan

1983

Plant Cell & Environment

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Abstract. Non‐differentiated tissue cultures (calli) of tobacco were found to be more sensitive to chloramphenicol (CAP) than differentiated tissues (shoots). The difference is especially manifested in darkness and at an irradiation regime lacking u.v. and blue light. Photodegradation of CAP solutions was demonstrated at moderate light fluence rates (6–15 Wm−2). The evidence indicates that the final products of photodegradation may be toxic or non‐toxic according to the irradiation regime. The implication of the present findings in establishing a selection system for resistance to chemicals, and especially CAP, using plant tissue cultures, is discussed.

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Section: Discussionsupporting

confidence: 66%

Sensitivity of tobacco tissue cultures to chloramphenicol and its photodegradation products

Barg

Umiel

Nitzan

1983

Plant Cell & Environment

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“…Chloroplast development, as observed microscopically, and total chlorophyll content were not affected by cytokinin treatment. These results contrast to those with cucumber (Fletcher and McCullagh, 1971;Harvey et aI., 1974;Wozny and Szweykowska, 1975;Farineau et aI., 1978), yet we did not pretreat the radish tissues with cytokinin in darkness before studies began. Galactolipids are present mainly in chloroplasts (Kates, 1970), and these lipids accumulated in radish cotyledons as growth and chloroplast development occurred; nevertheless, zeatin did not stimulate the accumulation.…”

Section: Discussion-our Microscopic Observationsmentioning

confidence: 71%

“…For cotyledons of cucumber (Harvey, Lu, and Fletcher, 1974), sunflower (Servettaz, Cortesi, and Longo, 1976) and watermelon (Longo et aI., 1978b), evidence suggests that cytokinins promote changes from a storage to a photosynthetic function. Cytokinins stimulate conversion of proplastids to chloroplasts in cotyledons or other tissues (Stetler and Laetsch, 1965;Harvey et aI., 1974;Wozny and Szweykowska, 1975;Farineau, Hoffelt, and Roussaux, 1978). Activities of certain photosynthetic enzymes (Harvey et aI., 1974;Feierabend and deBoer, 1978) or peroxisomal enzymes (Servettaz et aI., 1976;Longo et aI., 1979) are increased by cytokinin treatment.…”

mentioning

confidence: 99%

“…Enhanced chloroplast development in cotyledons is sometimes accompanied by more rapid disappearance of storage compounds. in flax (Sveshnikova and Khokhlova, 1968)and of both proteins and fats in cucumber (Wozny and Szweykowska, 1975) and watermelon (Longo et aI., 1978b(Longo et aI., , 1979 was observed after cytokinin treatment. Perhaps the glyoxylate pathway is accelerated by cytokinins, because they increased the activity of isocitrate lyase in squash (Penner and Ashton, 1967), sunflower (Servettaz et aI., 1976), and watermelon (Longo et aI., 1978a).…”

mentioning

confidence: 99%

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Cytological and Biochemical Aspects of Cytokinin‐enhanced Growth of Radish (Raphanus Sativus) Cotyledons

Thomas

Kugrens

Ross

1980

American J of Botany

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Light and electron microscopy revealed no stimulation of oleosome disappearance or chloroplast development associated with zeatin‐enhanced growth of excised radish cotyledons. Accelerated protein body breakdown was the only detectable effect of zeatin treatment. Isocitrate lyase activity, disappearance of total lipids, and appearance of galactolipids, phospholipids, and chlorophyll were unaffected by zeatin. Results indicate that cytokinins do not accelerate conversion of radish cotyledons from storage to photosynthetic organs.

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“…An increase in chlorophyll content by kinetin treatment was found in several investigations [1,9,16,37]. Borzenkova and Bortnikova [7] reported an increase in the size and especially in the number of chloroplasts of kinetintreated plants.…”

Section: Discussionmentioning

confidence: 88%

The effect of kinetin on the photosynthetic apparatus of Sinapis alba

Zerbe

Wild

1980

Photosynth Res

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The influence of kinetin during the development of primary leaves of Sinapis alba was investigated. Kinetin treatment (6 ppm) induced an increase of dry weight, of soluble reducing sugars, soluble protein, chlorophylls, carotenoids and cytochrome f; a higher ratio of chlorophyll a to chlorophyll b, higher rates of CO2 fixation per fresh weight and higher activity of nitrite reductase, were also found. These effects are comparable with strong and blue light adaptations. On the other hand, the Hill activity with ferricyanide as the electron acceptor, the rates of CO2 fixation per chlorophyll, the ratios of chlorophyll to cytochrome f and of protein to chlorophyll did not change. Therefore we assume that the kinetin induced and the light induced adaptations are brought about by different causal reaction chains.

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Effect of Cytokinins and Antibiotics on Chloroplast Development in Cotyledons of Cucumis sativus

Cited by 22 publications

References 31 publications

Sensitivity of tobacco tissue cultures to chloramphenicol and its photodegradation products

Sensitivity of tobacco tissue cultures to chloramphenicol and its photodegradation products

Cytological and Biochemical Aspects of Cytokinin‐enhanced Growth of Radish (Raphanus Sativus) Cotyledons

The effect of kinetin on the photosynthetic apparatus of Sinapis alba

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