Action of Gibberellic Acid on Cell Proliferation in the Subapical Shoot Meristem of Watermelon Seedlings

Liu, Peter B. W.; Loy, J. Brent

doi:10.1002/j.1537-2197.1976.tb11858.x

Cited by 24 publications

(6 citation statements)

References 23 publications

(23 reference statements)

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“…The leafy vegetables grown with this rate of GA 3 in the MNS responded with accelerated stem elongation that was accompanied by pale green and narrowed leaves in lettuce plants and by a relatively rapid flower development in rocket plants. It is well known that GA 3 treatments promote cell division and cell enlargements that may result in stem elongation [49][50][51][52] and that exogenous gibberellins can break the rosette or enhance and control the flowering of rosette plants by means of rapid enlargement of already differentiated tissues [53]. GAs promote cytogenesis and cell elongation in stems and can also stimulate flowering when they reach the shoot apex [54,55].…”

Section: Discussionmentioning

confidence: 99%

Effect of Gibberellic Acid on Growth, Yield, and Quality of Leaf Lettuce and Rocket Grown in a Floating System

et al. 2019

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Gibberellins (GAs) are growth hormones strongly involved in a wide variety of physiological activities. Currently, gibberellins are commercially used to enhance phenotypic characteristics, earliness, and productivity of many vegetable and ornamental crops. In this work, the efficacy of supplementation of low levels of gibberellic acid (0, 10−8, 10−6, and 10−4 M GA3) through the mineral nutrient solution of a floating system on yield and quality of leaf lettuce and rocket plants was tested. The marketability of plants was lost when 10−4 M GA3 was added to the mineral nutrient solution. This study demonstrated that the addition of 10−4 M GA3 exceeded the acceptable threshold for use in hydroponics production systems. Below the concentration of 10−4 M, the presence of GA3 in the mineral nutrient solutions (MNS), especially at 10−6 M GA3, stimulated plant growth and enhanced the yield. Various morphological and physiological traits were enhanced by GA3 treatments (biomass accumulation, leaf expansion, stomatal conductance, water use efficiency (WUE), Nitrogen use efficiency (NUE), etc.), with superimposable trends in both lettuce and rocket. The addition of 10−6 M GA3 to the nutrient solution of a hydroponic floating system can promote growth and quality of lettuce and rocket plants.

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Section: Discussionmentioning

confidence: 99%

Effect of Gibberellic Acid on Growth, Yield, and Quality of Leaf Lettuce and Rocket Grown in a Floating System

et al. 2019

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“…Although the gibberellins inhibit cell division in some instances (SETTERFIELD 1963, KAUFMAN et al 1969) more often they are stimulatory (BOEKEN and VAN OOSTVELDT 1977, KOHLER 1977, SHININGER 1975 especially in subapical tissue (WARDLAW 1965, Lm andLoy 1976). GA usually has less effect on mitotic activity in the shoot apical meristem itself (see review by Loy 1977), an indication that it may be more effective in initiating cell division than in accelerating division in cells already mitotically active.…”

Section: Effects Of Other Growth Regulatorsmentioning

confidence: 96%

Functions of Hormones at the Cellular Level of Organization

Evans¹

1984

Hormonal Regulation of Development II

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“…Indeed, exogenous GA3 reportedly reduces the length of the G' and S phases of the cell cycle in the subapical meristems of dwarf watermelon seedlings (11).…”

Section: Discussionmentioning

confidence: 97%

Determination of the Cellular Mechanisms Regulating Thermo-Induced Stem Growth in Thlaspi arvense L

Metzger

Dusbabek²

1991

Plant Physiol.

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Field pennycress (Thiaspi arvense L.) is a species with a cold requirement for the initiation of reproductive development (thermoinduction). Work in this laboratory has been focused on elucidating the biochemical and molecular mechanisms underlying the bolting or rapid stem elongation response that is an intricate part of reproductive development in this species. In the present paper the cellular basis for thermo-induced stem growth was determined. Evidence is presented indicating that bolting results from the production of new cells that elongate to their original length before thermoinduction. This increase in cell division occurs in the pith and cortex approximately 0.5 to 5.0 millimeters below the stem apex. For at least the early stages of thermoinduced stem growth, enhanced cell elongation does not appear to be a factor because average lengths of pith cells from stems of thermo-induced plants were similar or less than noninduced controls. In addition, both the amount of increase in the production of new pith cells and stem growth were positively correlated with the length of the cold treatment. Two other lines of evidence are presented corroborating previous assertions (JD Metzger [1985] Plant Physiol 78: 8-13) that gibberellins mediate thermo-induced stem growth in field pennycress. First, treatment of noninduced plants with gibberellin A3 completely mimicked the effects of a 4-week cold treatment on mitotic activity in the pith and cortex. Second, very little increase in the production of new cells was observed in the pith and cortex of thermo-induced plants of a gibberellin-deficient dwarf mutant of field pennycress. It is also shown that the influence of photoperiod on stem growth is mediated by an effect on the final length that cells ultimately attain.

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Action of Gibberellic Acid on Cell Proliferation in the Subapical Shoot Meristem of Watermelon Seedlings

Cited by 24 publications

References 23 publications

Effect of Gibberellic Acid on Growth, Yield, and Quality of Leaf Lettuce and Rocket Grown in a Floating System

Effect of Gibberellic Acid on Growth, Yield, and Quality of Leaf Lettuce and Rocket Grown in a Floating System

Functions of Hormones at the Cellular Level of Organization

Determination of the Cellular Mechanisms Regulating Thermo-Induced Stem Growth in Thlaspi arvense L

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