scholarly journals Influence of growth regulators and respiration inhibitors on dark transformation of phytochrome in coleoptiles of oat seedlings

2014 ◽  
Vol 52 (2) ◽  
pp. 139-148 ◽  
Author(s):  
Jan Kopcewicz ◽  
Mariusz Cymerski ◽  
Kazimierz Madela
Keyword(s):  
Growth Regulators ◽  
Red Light ◽  
Antimycin A ◽  
Growth Substances ◽  
Respiration Inhibitors

Irradiation with red light leads to the formation of an unstable, undergoing gradual destruction, physiologically active P<sub>FR</sub> form of phytochrome in the coleoptiles of oat seedlings. Growth substances: IAA, GA<sub>3</sub>, kinetin, ABA, ethrel as well acetylcholine do not influence the nature and rate of phytochrome dark transformation. Inhibitors of energy-producing processes such as KCN, 2,4-DNP, DCCD and antimycin A inhibit the process of dark destruction of the P<sub>FR</sub> form of phytochrome.

scholarly journals ACCESSIBILITY OF APPLICATION OF GROWTH REGULATORS IN VITICULTURE

Russian vine ◽  
2020 ◽  
Vol 14 ◽  
pp. 37-43
Author(s):  
I.A. Avdeenkо ◽  
Keyword(s):  
Growth Regulators ◽  
Growth Substances ◽  
Promising Direction ◽  
The Past ◽  
Russian Federa Tion

Over the past few years in the Russian Federa-tion, especially in the Krasnodar Territory and Crimea, there has been an increase in the area of vine plantations. In this regard, carrying out additional operations that increase the rooting rate and quality of grape seedlings and cut-tings is a promising direction in nursery. The use of growth substances for rooting grape cuttings has proven to be the simplest and most economical way to achieve these goals. The paper analyzes the results of studies by various authors, proving the effectiveness of the use of growth substances on a grape plant.

scholarly journals Effects of growth regulators on productivity of soybean (Glycine max cv. Davis) under competition

1981 ◽  
Vol 38 (1) ◽  
pp. 289-298 ◽  
Author(s):  
Paulo R.C. Castro
Keyword(s):  
Glycine Max ◽  
Gibberellic Acid ◽  
Growth Regulators ◽  
Seed Weight ◽  
Dry Weight ◽  
Trimethylammonium Chloride ◽  
Growth Substances ◽  
Triiodobenzoic Acid

The effects of growth substances on productivity of 'Davis' soybean maintained under competition was investigated. Before the flowering, Agrostemmin (1 g/10 ml/3 1), gibberellic acid (GA) 100 ppm, and (2-chloroethyl) trimethylammonium chloride (CCC) 2,000 ppm were applied. At the flower anthesis, 2,3,5-triiodobenzoic acid (TIBA) 20 ppm was applied. Other two applications with TIBA, with intervals of four days, were realized. The growth regulators did not affect the productivity of 'Davis' soybean maintened under competition. The competition among plants did not affect the stem dry weight and number of pods, and seeds. The competition reduced weight of pods without seeds, seed weight, and weight of 100 seeds.

scholarly journals Phytochrome-controlled level of growth substances in etiolated oat seedlings

2014 ◽  
Vol 61 (3-4) ◽  
pp. 381-388
Author(s):  
Jan Kopcewicz ◽  
Kazimierz Madela
Keyword(s):  
Abscisic Acid ◽  
Acid Content ◽  
Red Light ◽  
Light Irradiation ◽  
Growth Substances ◽  
Photostationary State ◽  
Endogenous Abscisic Acid ◽  
Abscisic Acid Content

Irradiation with red light of coleoptiles and leaves of etiolated oat seedlings, causing photoconversion of phytochrome mainly into P<sub>fr</sub>, leads to the release of free auxins and free gibberellins from conjugated forms. The effect of red light is reversible by far-red light irradiation. A correlation between the photostationary state of phytochrome and endogenous abscisic acid content was not found.

scholarly journals The effect of media and growth regulators on in vitro rooting of olive (Olea europaea L.) cv. Gordal.

2007 ◽  
Vol 1 (1) ◽  
pp. 5-15
Author(s):  
Qais Jamel Abdul Majeed
Keyword(s):  
Growth Regulators ◽  
Root Length ◽  
In Vitro Rooting ◽  
Nodal Explants ◽  
Growth Substances ◽  
Surface Sterilization ◽  
Rooting Media ◽  
Half Strength ◽  
The Media

Nodal explants of difficult-to-root Gordal olive were cultured on half-strength OM medium after surface sterilization with 15% NaOCl for 20 minutes. The in vitro-proliferated shoots were then submitted for 25 days to rooting trials including various concentrations of NAA and IBA and different half-strength rooting media as well.Among the media tested during rooting stage, highest rooting percentage 62% found in both OM and MS half-strength media when both the growth substances were used, and 87.5 and 90% gained when IBA and NAA were added to the rooting media at 2 Mg/L each, respectively.Highest number of roots 1.85 and highest root length 3.09 mm obtained with half-strength MS and OM media respectively, when IBA was used with these media. And IBA at 2 Mg/L in the rooting media gave the highest number of roots 2.5 with 4.13 mm length.However, 2 Mg/L NAAin the rooting media gave 1.94 number of roots with length of 3.88 mm, while number of roots 1.38 with 2.79 length obtained with half- strength OM media when NAA was used in the rooting media .It is therefore concluded that best medium for in vitro rooting of Gordal microcuttings is half- strength OM supplemented with 2 mg/L of IBA.

scholarly journals Light Quality Effects on Flower Sex Expression in Cucumber and Spinach

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 464D-464 ◽  
Author(s):  
Gary R. Bachman ◽  
Margaret J. McMahon
Keyword(s):  
Growth Regulators ◽  
Light Quality ◽  
Red Light ◽  
Female Flower ◽  
Sex Expression ◽  
Internode Elongation ◽  
Dioecious Species ◽  
Spectral Filters ◽  
Male Flowers

Using spectral filters to reduce the amount of far-red (FR) light perceived by plants has been shown to effectively reduce internode elongation of many floriculture crops. It is theorized that gibberellin (GA) function is inhibited in some way by the increase in the red: far-red light ratio. Sex expression of flowers are effected by exogenous applications of gibberellin and cause a shift in flower sex expression towards maleness. The use of growth regulators (GA inhibitors) have demonstrated a shift towards femaleness. Flowering of spinach, a dioecious species, and cucumber (staminate and pistillate lines), a monoecious species, were surveyed for shifts in flower sex expression, indicating a suppression of GA. Male: female flower ratio decreased from 7.6:1 to 4.06:1 when comparing the controls and –FR for the staminate cucumber line and 1:13 to 1:40 for the gynecious cucumber line. The decrease in male flowers on plants grown in a –FR environment are an indication that the function of GA is inhibited. There was no significant effect on the male: female flower ratios of the spinach.

The effects of the parent environment on seed germinability

1991 ◽  
Vol 1 (2) ◽  
pp. 75-84 ◽  
Author(s):  
M. Fenner
Keyword(s):  
Red Light ◽  
Field Observations ◽  
Growth Substances ◽  
Parent Plant ◽  
High Nitrogen ◽  
Nitrogen Levels ◽  
Wide Range ◽  
Ecological Implications ◽  
Growing Conditions ◽  
Short Days

AbstractThe growing conditions of a parent plant may affect the degree of dormancy of its seeds. This has been demonstrated in numerous species, both wild and cultivated. The evidence comes from field observations and controlled experiments. A survey of the literature shows that some well defined patterns emerge, with certain environmental factors tending to have similar effects over a wide range of species. Lower dormancy (i.e., increased germinability) is generally associated with the following environmental conditions during seed development: high temperatures, short days, red light, drought and high nitrogen levels. The effects are probably the result of changes in the quantity, mobility or activity of growth substances such as abscisic acid. The ecological implications of the phenomenon are briefly discussed.

THE EFFECT OF FLASHING LIGHT SUPPLEMENTED BY CONTINUOUS RED AND FAR-RED LIGHT ON THE GROWTH OF LEMNA MINOR L. IN THE PRESENCE OF GROWTH REGULATORS

1964 ◽  
Vol 42 (1) ◽  
pp. 57-64 ◽  
Author(s):  
S. E. Chua ◽  
M. H. Dickson
Keyword(s):  
Growth Rate ◽  
Growth Regulators ◽  
Photosynthetic Rate ◽  
Lemna Minor ◽  
Light Exposure ◽  
Red Light ◽  
Light Period ◽  
Continuous Illumination ◽  
Low Intensity ◽  
Flashing Light

The growth rates of Lemna minor were studied under conditions of flashing light of varied durations interacted with continuous illumination of low-intensity far-red and red light, and growth regulators (0.645 p.p.m. kinetin, and 25 p.p.m. IAA). It was found that the growth rate was progressively reduced with decreasing light exposure from continuous illumination to alternating periods of 1-minute intermittency, after which it increased rapidly. The growth rate per unit of light was the most rapid at 0.01-second light period under 1:3 ratio of light to dark. Under 1:1 ratio of light to dark interacted with red and far-red light, kinetin, and IAA, the photosynthetic rate of Lemna was reduced by far-red but improved by the red light. Kinetin increased the growth rate but IAA inhibited the photosynthetic rate as the number of flashes increased. The IKI test showed that under flashing light old and young fronds stored starch but under continuous illumination, only the older fronds stored starch.

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