Inhibition of Plant Growth by Root-Drench Applications of Kinetin

Kemp, H. T.; Fuller, Rusty; Davidson, R.

doi:10.1126/science.126.3284.1182

Cited by 18 publications

(9 citation statements)

References 4 publications

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“…Similar results for kinetin were found by Meidner (18) in barley leaves and by Luke and Freeman (16) in oat leaves. Kemp, Fuller, and Davidson (7) studied the effect of kinetin applied through the roots on tomato growth, and found that on hot days treated plants wilted more than the controls. In contrast to the opening effect of kinetin, synthetic auxins induce closure of stomata.…”

mentioning

confidence: 99%

Abnormal Stomatal Behavior and Hormonal Imbalance in flacca, a Wilty Mutant of Tomato

Tal¹,

Imber²,

Itai³

1970

Plant Physiol.

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The wilty tomato mutant, flacca, and the normal variety, Rheinlands Ruhm, were compared for kinetin-like activity in ontogeny. The mutant wilts easily because its stomata resist closure. This stomatal resistance decreases with age. The occurrence of a root factor which induces stomatal opening was inferred from grafting experiments. It was hypothesized that the excessive stomatal openings in thc mutant may result from excess of kinetin -like activity in the leaf of that plant. In addition, it was suggested that the closure of stomata in the aging mutant is due to a decrease of kinetin-like activity with age. Kinetin-like activity in the leaf was determined by incorporation of labeled leucine. The concentration of cytokinins in root exudate and leaf extract was determined by the sovbean callus assay. Evidence was presented of higher kinetin-like activity in the leaves of the mutant and higher cytokinin concentration in its root exudate. Cytokinin concentration in the shoot was found to be only slightly higher in the mutant than in the normal plants. Kinetin-like The following working hypothesis is suggested to explain the excessive stomatal opening and the root effect in the mutant. The excessive opening of stomata is induced by a higher kinetinlike activity occurring in the mutant leaf, compared with the normal. This higher activity in the mutant leaf may result either from a higher concentration of cytokinins produced by the mutant root, or from a lower concentration of antagonists to cytokinins in the mutant leaf. The production of these inhibitory substances may depend on the root. The production of hormones with kinetin-like activity by the root has been demonstrated in several plant species (8,15,24). This paper presents a comparative study of kinetin-like activity in the leaf, concentration of kinetin-like substances in root exudate and shoot extract, and of stomatal behavior in young and mature mutant and normal plants. MATERIALS

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mentioning

confidence: 99%

Abnormal Stomatal Behavior and Hormonal Imbalance in flacca, a Wilty Mutant of Tomato

Tal¹,

Imber²,

Itai³

1970

Plant Physiol.

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“…The inhibition of root growth by kinetin has been described before by Skinner and Shive (1955), Guttman (1956), DeRopp (1956, Kemp et al (1957), Torrey (1957), Miller (1957), McManus (1960), Butcher andStreet (1960), Fries (1960), Burstrom (1960), and Humphries (1960), among others. However, because these investigations either do not deal with intact plants, or lack adequate quantitative data on root inhibition, or, of more importance, fail to use wide concentration ranges of kinetin, detailed comparisons with the present study are difficult.…”

Section: Kinetin Inhibition Of Leaf and Root Growth-mentioning

confidence: 72%

Kinetin Modification of Sporeling Ontogeny in Marsilea Vestita

Laetsch

Briggs

1961

American J of Botany

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Laetsch, W. M., and Winslow R. Briggs. (Stanford U., Stanford, Calif.) Kinetin modification of sporeling ontogeny in Marsilea vestita. Amer. Jour. Bot. 48(5): 369–377. Illus. 1961.—Sporelings of the fern, Marsilea vestita Hook. and Grev., were cultured aseptically with a wide concentration range of kinetin. The elongation of the primary and all succeeding roots was significantly inhibited by concentrations as low as 0.3 γ/l., and was almost completely inhibited at concentrations above 30 γ/l. Root inhibition by kinetin was a result of decreased cell division and was not influenced by the amount of available carbon in the medium. The primary leaves also were inhibited by kinetin, but only by higher concentrations. The relative numbers of organs present were altered by intermediate concentrations, with a rise in the number of roots per plant, and a corresponding decrease in the number of leaves. Sporelings maintained in these kinetin concentrations for long periods developed abnormal leaves and roots. The shoot apex lost its organization in higher concentrations and proliferated into callus. The histology of the callus is discussed. The kinetin effects were independent of light conditions. Various other growth‐active compounds were studied in combinations with each other and with kinetin for their effects upon sporelings. Interactions between these compounds were not apparent, and they neither substituted for nor modified the effects of kinetin. The use of kinetin as a tool in morphogenetic study is discussed.

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“…Although many types of growth responses for explants and dark-grown seedlings have been recorded, data for over-all changes in dry matter accumulation, and morphological modifications of photosynthetically active kinetin-treated intact plants, are lacking. Kemp, Fuller and Davidson (1957) observed that the height and flowering of tomato plants grown in sand culture were strongly inhibited by kinetin supplied through the roots. We have extended and amplified these observations to include other plants, and additional responses to kinetin and related compounds introduced into intact green plants via the roots.…”

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Some Effects of Kinetin on the Growth and Flowering of Intact Green Plants

Wittwer

Dedolph

1963

American Journal of Botany

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Wrr-rwicn, S. H., and R. R. Ih;DOJ,PH. (Michigan State U., E. Lansing.) Some effects of kinetin on the growth and flowering of intact green plants. Amer. Jour. Bot. 50(4): 330-336. IIIus. 1()63.-Dry matter accumulation of aerial parts, and heights of tomato, cucumber, and pea plants were markedly reduced when kinetin was incorporated into the culture solution root medium in concentrations ranging from 10-5 to 10-7 M. Concentrations which suppressed top growth (height, dry weight) generally had lesser effects on root growth and, in some instances, enhanced it. Thus top/root ratios were greatly reduced and approached unity in kinetin-treated peas and tomatoes. Flowering was inhibited in tomatoes and accelerated in peas. There were marked changes in root morphology, including the formation of pseudonodules. Kinetin had an effect which was opposite to that of gibberellin on internode elongation, root extension, top/root ratios and flowering of dwarf peas. N6-benzyladenine was more active than kinetin in suppressing the growth of intact green plants. The data show that kinetin can markedly alter the behavior of intact plants when absorbed by the roots from culture solutions in which the concentrations are comparable to those which are biologically active on explants,

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Inhibition of Plant Growth by Root-Drench Applications of Kinetin

Cited by 18 publications

References 4 publications

Abnormal Stomatal Behavior and Hormonal Imbalance in flacca, a Wilty Mutant of Tomato

Abnormal Stomatal Behavior and Hormonal Imbalance in flacca, a Wilty Mutant of Tomato

Kinetin Modification of Sporeling Ontogeny in Marsilea Vestita

Some Effects of Kinetin on the Growth and Flowering of Intact Green Plants

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