Winter growth stimulation by gibberellin in differentially grazed pastures of Phalaris tuberosa

Williams, C. F.; Arnold, GW

doi:10.1071/ea9640225

Cited by 9 publications

(7 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Gibberellins are plant hormones widely distributed in actively growing reproductive and vegetative tissues of higher plants (Lang 1970). One of the effects of gibberellin application to plants is that the temperature range for active growth is widened, promoting higher growth rates at suboptimal temperatures (Morgan & Mees 1958;Williams & Arnold 1964;Lester & Carter 1970;Whitney et al 1973). Gibberellic acid A3 (GA) is the most common form of gibberellin, and is available commercially in 90% biologically active preparations.…”

Section: Introductionmentioning

confidence: 99%

Cool-season growth responses of kikuyu grass and ryegrass to gibberellic acid

Percival¹

1980

New Zealand Journal of Agricultural Research

View full text Add to dashboard Cite

Application of gibberellic acid at 100 g a.i./ha in July resulted in rapid visual responses in both kikuyu grass and ryegrass swards in the form of elongation and a slight yellowing of foliage. Ground level cuts showed significant dry matter responses of both kikuyu grass and ryegrass to gibberellic acid, but they were smaller than the visual responses indicated. The greatest response from kikuyu was the equivalent of 11 kg DM/ha/day. In both grasses, gibberellic acid affected mainly the vertical distribution of dry matter, as reflected in either the dry matter yield or the proportion of dry matter above 3 em. There were indications that gibberellic acid reduced regrowth after trimming of both kikuyu and ryegrass.

show abstract

Section: Introductionmentioning

confidence: 99%

Cool-season growth responses of kikuyu grass and ryegrass to gibberellic acid

Percival¹

1980

New Zealand Journal of Agricultural Research

View full text Add to dashboard Cite

show abstract

“…Continued autotrophic growth may not always occur thereafter. The shoot of seedlings resulting from the use of GA3 does turn green in light but is often paler than normal, as reported by Morgan and Mees (1958) and Williams and Arnold (1964). This may signify impaired chlorophyll synthesis or soil nutrient uptake.…”

Section: Response Patterns To Ga3 Stimulationmentioning

confidence: 70%

Germinating the seeds of three species of Pimelea sect. Epallage (Thymelaeaceae)

Silcock¹,

Mann²

2014

Aust. J. Bot.

View full text Add to dashboard Cite

Abstract. Pimelea trichostachya Lindl., P. simplex F.Muell. and P. elongata Threlfall frequently cause pimelea poisoning of cattle. Fresh seeds of these species, belonging to sect. Epallage (Endl.) Benth. of Pimelea Gaertn. (Thymelaeaceae) are strongly dormant for years when in laboratory storage. Common methods of stimulating germination, such as scarification, dry heat and cold stratification, did not remove much of the dormancy. 'Smoke-water' stimulated some germination but its effect was unpredictable and many seedlings then grew aberrantly. Exposure of imbibed seeds to gibberellic acid greatly and reliably improved the germination of all three species. However, the manner of application and the concentration of gibberellic acid used had to be appropriate or many young seedlings grew abnormally or died suddenly, limiting successful plant establishment rates. The dormancy type involved is non-deep Type 2 physiological. Ten days of good moisture, in addition to gibberellic acid exposure, is required before appreciable laboratory germination occurs at optimal temperatures. Thus, the mechanism by which gibberellic acid stimulates good germination does not appear to be the same as that which primes seeds for the rapid and prolific germination often seen under natural conditions in arid Australia. Seeds of P. simplex subsp. continua (J.M.Black) Threlfall proved most difficult to germinate and those of P. elongata the easiest.

show abstract

“…strict growth (Morgan and Mees, 1953;Williams and Arnold, 1964). The results of Coleman et al (1959) suggest that the response of sugarcane to GA is enhanced by moisture stress and at low temperature.…”

Section: Discussionmentioning

confidence: 99%

Effects of Environmental Conditions and the Coadministration of Growth Retardants on the Response of Sugarcane to Foliar Treatment with Gibberellin1

Yates

1972

Agronomy Journal

View full text Add to dashboard Cite

Poor yields of sucrose from sugarcane are often associated with low sucrose:cane ratios, particularly when climatic conditions tend to favor stem elongation rather than sucrose accumulation. Plant growth regulators may be used to modify environmental effects on the growth of sugarcane and thus alter the balance between utilization and storage of sucrose. The objectives of this study were to investigate the influence of temperature, soil moisture, and the coadministration of plant growth retardants on the response of sugarcane to treatment with gibberellic acid. Single foliar applications of GA (gibberellic acid) commercial sugarcane varieties (interspecific hybrids of Saccharum) stimulated stem elongation for from 2 to 6 weeks, but this response was not reflected in higher cane yields unless the plants were harvested within 6 weeks of treatment. A second application of GA at 4 weeks prolonged the growth response. In the field low temperatures were associated with the more prolonged growth responses, which were of smaller amplitude. Moisture stress had no apparent effect on GA response. No correlations were evident between environmental conditions or application rates and the duration of growth responses in greenhouse trials, but the amplitude increased with application rate within the range of 25 to 200 ppm. Three to five immature or semimature internodes were affected. In field trials under warm conditions a period of growth retardation followed the initial GA‐induced growth stimulation. This did not occur in greenhouse trials. Stem‐sugar concentrations fell during the growthstimulation phase, but recovered as growth rates reduced. Attempts were made to accentuate this recovery, and so to increase the accumulation of sugars, by coadministration of growth retardants with GA. Dalapon had a delayed effect on cane growth, slightly curtailing the duration of the GA response, and suppressing growth thereafter. The phase of growth suppression was accompanied by increased stem sugar concentration in greenhouse‐, but not in field‐trials. Sodium silicate (at up to 200 ppm) had no significant effect on growth or sugar accumulation and did not modify the response to GA. Treatment with azauracil (at up to 400 ppm) strongly inhibited cane growth and increased stem‐sugar concentrations, but showed no significant interaction with GA.

show abstract

Winter growth stimulation by gibberellin in differentially grazed pastures of Phalaris tuberosa

Cited by 9 publications

References 10 publications

Cool-season growth responses of kikuyu grass and ryegrass to gibberellic acid

Cool-season growth responses of kikuyu grass and ryegrass to gibberellic acid

Germinating the seeds of three species of Pimelea sect. Epallage (Thymelaeaceae)

Effects of Environmental Conditions and the Coadministration of Growth Retardants on the Response of Sugarcane to Foliar Treatment with Gibberellin1

Contact Info

Product

Resources

About