Studies with Muscle Relaxant Labeled with Iodine-131

Leben, Curt; Barton, Lela V.

doi:10.1126/science.125.3246.494-a

Cited by 29 publications

(13 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In grasses, GA stimulates shoot elongation largely by increasing cell elongation (Rood et al, 1986; Watschke et al, 1992). Applications of GA reduce turf quality by causing a lighter green color (Leben et al, 1959; Juska, 1959), reduced tillering (Leben et al, 1959), root growth, and root/shoot ratios (Juska, 1959) Similar responses have been observed on turf grown under shaded conditions (Peacock and Dudeck, 1981), suggesting that GA synthesis is at least partially responsible. A sparse turf stand, easily damaged by traffic and disease, is characteristic under shaded conditions and proper management is difficult.…”

mentioning

confidence: 53%

Flurprimidol Effects on Kentucky Bluegrass under Reduced Irradiance

et al. 1999

View full text Add to dashboard Cite

Turf management in shaded conditions is difficult in part because the reduced irradiance causes excessive shoot elongation, reduced tillering and root growth, and weak plants exceptionally prone to damage. Successful installation of natural grass athletic fields in covered or shaded stadia require improved management procedures. The objective of this study was to determine if flurprimidol [α‐(1‐=‐methylethyl)‐α‐[(trifluourmethoxy)phenyl]‐5‐pyrimidinemethanol], a gibberellic acid (GA)‐biosynthesis inhibitor, could be used to increase turf quality for athletic fields in covered stadia and other reduced irradiance situations. Portable plots of Kentucky bluegrass (Poa pratensis L.) were established outdoors and moved inside a covered‐stadium simulator facility (CSSF). Four rates of flurprimidol (0.56, 1.12, 1.68, and 2.80 kg ha−1) were compared against a control. Studies were conducted under ambient (equivalent to 2–3% full summer sunlight) and supplemental (equivalent to 9–18% full summer sunlight) irradiance. The turf was evaluated with and without simulated soccer traffic. Under ambient irradiance conditions, turf quality generally declined to unacceptable levels within 30 d, although the low rate of flurprimidol extended this period for up to 60 d. Supplemental irradiance provided turf of acceptable quality for up to 70 d and the low rate of flurprimidol extended this period for >100 d. Applications repeated within 30 to 40 d virtually stopped measurable shoot growth under all irradiance and traffic regimes. Flurprimidol did not affect turf shear resistance or rooting but did increase tillering. Low rates of flurprimidol should be useful for maintaining turf in reduced irradiance conditions because turf quality is enhanced with minimal risk of phytotoxicity.

show abstract

mentioning

confidence: 53%

Flurprimidol Effects on Kentucky Bluegrass under Reduced Irradiance

et al. 1999

View full text Add to dashboard Cite

show abstract

“…Though in most arable crops no yield increases resulted from a single treatment, increases in dry yield of pasture grass were consistently obtained. Increased yield of grass has also been recorded by Leben & Barton (1957), and Wittwer,Bukovac & Grigsby (19j7a). Wittwer & Bukovac (1957a) have recorded substantial increases in yield of celery on a field scale.…”

Section: (B) French Bean and Cupid Sweet Peamentioning

confidence: 72%

Effects of Gibberellins on Plant Growth and Development

Brian¹

1959

Biological Reviews

177

View full text Add to dashboard Cite

Summary The gibberellins are metabolic products of the fungus Gibberella fujikuroi (conidial state Fusarium moniliforme). Three gibberellins are known: gibberellic acid (C19H22O6), gibberellin A1 (C19H24O6) and gibberellin A2 (C19H26O6). A structure for gibberellic acid has been proposed. Gibberellin A1 is a dihydro derivative of gibberellic acid. The structure of gibberellin A2 has not yet been established. The biological activity of all three gibberellins is, as far as is known at present, zqualitatively similar; no truly quantitative comparisons have been reported. In describing biological results below, the abbreviation GA may refer to any one gibberellin or to mixtures. The most characteristic effects of GA on shoot growth are increased inter‐node extension, increased leaf‐growth and enhanced apical dominance. Under some circumstances, with some plant species, treatment with GA does not stimulate growth of intact roots, though some root sections do respond by increased growth. High concentrations of GA are only slightly inhibitory, results in increased dry weight. This is mainly due to increased carbon fixation and is believed to be a secondary effect of increased leaf growth. Not all plants respond to GA by increased shoot growth and the effect on some species is greater than that on others. In species in which dwarf mutants are known, the dwarf may frequently be induced by GA to grow in a form in‐distinguishable from that of the tall phenotype, genetically tall plants themselves being unaffected. Many forms of dormancy are broken by GA. These include seed dormancy, dormancy of potato tubers and dormancy of shoot internodes and buds. GA will induce flowering of long‐short‐day plants kept permanently in short‐day photoperiods. I t will induce stem growth and, in long‐day photoperiods but possibly not in short days, flowering in cold‐requiring biennial long‐day plants. It inhibits flowering of short‐day plants in inductive short‐day photoperiods. I t will induce stem growth and, in long‐day photoperiods but possibly not in short days, flowering in cold‐requiring biennial long‐day plants. It inhibits flowering of short‐day plants in inductive short‐day photoperiods. In its effects on vegetative cell extension GA has certain similarities to the auxins but there are also differences. The most important differences are: (a) auxins greatly increase cell‐extension in excised tissue sections, whereas GA has little effect; (6) GA induces marked cell extension in shoots of some intact plants, whereas exogenous auxins have little effect; (c) auxins inhibit root growth strongly, but GA does not. There is evidence from several sources that GA only influences cell extension if auxin is present. Comparison of the growth rate of excised pea internode sections with the growth rate of comparable tissues in intact plants, using untreated and GA‐treated plants as sources of both types of material, has led to the conclusion that the endogenous auxins of plants are limited in their effects, and that growth is correspondingly li...

show abstract

“…The results presented in Table 4 indicate that treatment with 1, 10 and 100 mg/1 of GA leads to slight changes in the dry weight of seedlings at all stages of germination. Inconsistent values regarding the fresh and dry weights of GA-treated plants have been found in several plants, irrespective of whether there is a gain or loss in the weights (Rappaport 1957a, b, Bukovac and Wittwer 1956, Brian et al 1954, Leben and Barton 1957, Martheta/. 1956.…”

Section: Discussionmentioning

confidence: 98%

Experimental Studies on Plant Metabolism

Yoünis

Foda

El-Ghobashy

1971

Physiologia Plantarum

View full text Add to dashboard Cite

Treatment of Ricinus communis seeds with GA accelerated the production of reducing sugars and increased the total carbohydrate content. The effect increased progressively with increasing concentration of GA. -GA treatment also induced an earlier appearance of starch which was shown to be completely absent at the early stages of germination. Furthermore, GA accelerated the conversion of oils into carbohydrates. --Analysis of germinating seeds for their nitrogen content showed that whenever an increase in soluble-N due to GA treatment was detected, there was a decrease in protein-N. Breakdown of protein and formation of soluble-N increased progressively with increase in GA concentration. -GA induced variable changes in the length of the radicles and the hypocotyls, the dry weight and the water content of germinating seeds.

show abstract

Studies with Muscle Relaxant Labeled with Iodine-131

Cited by 29 publications

References 3 publications

Flurprimidol Effects on Kentucky Bluegrass under Reduced Irradiance

Flurprimidol Effects on Kentucky Bluegrass under Reduced Irradiance

Effects of Gibberellins on Plant Growth and Development

Experimental Studies on Plant Metabolism

Contact Info

Product

Resources

About