scholarly journals Gibberellic Acid Effect on Growth and Flowering of Ajania Pacifica /Nakai/ Bremer et Humphries

2013 ◽  
Vol 21 (1) ◽  
pp. 21-27 ◽  
Author(s):  
Małgorzata Zalewska ◽  
Małgorzata Antkowiak
Keyword(s):  
Gibberellic Acid ◽  
Vegetative Growth ◽  
Distilled Water ◽  
Water Control ◽  
Cultivation Time ◽  
Short Day ◽  
Long Day ◽  
Acid Effect ◽  
Ornamental Species ◽  
Effect On Growth

Abstract The research addressed the effect of gibberellic acid (GA3) on growth and flowering of Ajania pacifica /Nakai/ Bremer et Humphries ‘Bea’. The vegetative growth lasted for 8 weeks in glasshouse, under natural long day and from August 15 - under natural short day. The plants were divided into four groups: 1 - the plants sprayed with distilled water (control combination); 2, 3 and 4 - the plants sprayed with GA3 ones, twice and thrice, respectively, starting from the 5th week of growth, and then in the 6th and 7th week, successively. Each of the group was divided into two subgroups: the first one treated with GA3 at concentration of 250 mg·dm-3 and the second with 500 mg·dm-3. It was observed that double spraying with GA3 accelerated the buds development of Ajania pacifica, thus shortened the cultivation time by about two days. Treatment with GA3 at concentration 500 mg·dm-3 stimulated the elongation of shoots more than treatment with GA3 at 250 mg·dm-3. The plants sprayed twice were longer than the control and then those sprayed one time. However, elongation of shoots was not remarkable; corymbs were shorter, narrower, and contained lesser number of inflorescences. The present study indicates the specificity of the response of Ajania pacifica to GA3 treatment, which appears to be different from other ornamental species.

scholarly journals Foliar spray of gibberellic acid influences morphological attributes and foliage yield of coriander (Coriandrum sativum L.)

2018 ◽  
Vol 5 (1) ◽  
pp. 1-9
Author(s):  
Dhiman Das ◽  
Asim Kumar Bhadra ◽  
Mohd Moniruzzaman
Keyword(s):  
Gibberellic Acid ◽  
Vegetative Growth ◽  
Leaf Length ◽  
Distilled Water ◽  
Water Spray ◽  
Single Plant ◽  
Plant Weight ◽  
Morphological Attributes ◽  
Number Of Leaves ◽  
Different Doses

A field experiment was conducted at the research field of Sher-e- Bangla Agricultural University, Dhaka during the period from December 1, 2016 to January 11, 2017 to investigate the effect of gibberellic acid (GA3) on vegetative growth, morphological attributes and foliage (leaf) yield of coriander (Coriandrum sativum L.). The experimental treatments consisted of eight different doses of GA3 viz., 0 (distilled water spray), 5, 10, 15, 20, 25, 30 and 35 ppm. The variety Rosina (Pahuja Co., India) was used as planting material and different doses of GA3 were applied on the plants at 25 and 30 days after sowing. The experiment was laid out in Randomized Complete Block Design with three replications. GA3 had significant effect on vegetative growth, morphology, foliage yield and yield contributing characters of coriander. Plant height, number of leaves plant-1, leaf length, plant spread and single plant weight were found maximum from the application of GA3 at 20 ppm, which was closely followed by 25 ppm GA3. Application of GA3 at 20 ppm produced the highest weight of foliage m-2. A strong positive correlation of foliage yield was observed with plant height, number of leaves plant-1, leaf length, plant spread, single plant weight and weight of foliage m-2. Application of GA3 at 20 ppm gave maximum foliage yield (9.34 t ha-1) which was followed by GA3 at 15 ppm (8.46 t ha-1) and 25 ppm (8.06 t ha-1), and the minimum foliage yield was recorded from control (distilled water spray) (4.90 t ha-1). Application of GA3 at 20 ppm increased foliage yield over control by 47.54 %. A quadratic relationship between applied GA3 concentration and foliage yield was found; the regression equation was y = 4.87 + 0.375x – 0.009x2 from which it came up to be optimum dose of GA3 as 20.83 ppm.Res. Agric., Livest. Fish.5(1): 1-9, April 2018

scholarly journals Gibberellic acid flower formation and stem elongation in Silene armeria.

1973 ◽  
Vol 21 (4) ◽  
pp. 245-255
Author(s):  
S.J. Wellensiek
Keyword(s):  
Gibberellic Acid ◽  
Stem Elongation ◽  
Flowering Plants ◽  
Plant Age ◽  
Flower Formation ◽  
High Concentration ◽  
Short Day ◽  
Long Day ◽  
Silene Armeria

Several selected S. armeria lines differing in their reaction to GA3 were treated with GA3 at various concentrations under short-day (SD) or long-day conditions. With SD treatment one application of GA3 at high concentration (10 000 p.p.m. or greater) induced flower formation in certain lines. Stem elongation increased with GA3 concentration and with plant age and was much greater on flowering plants than on non-flowering ones. [For previous related work see HcA 41, 4400.]. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Influence of Photoperiod and Minimum Overwintering Temperature on Growth of Nursery Liners

1985 ◽  
Vol 3 (1) ◽  
pp. 25-27
Author(s):  
Carol Daggett ◽  
Gerald L. Klingaman
Keyword(s):  
Plant Species ◽  
Treatment Effect ◽  
Temperature Regime ◽  
Vegetative Growth ◽  
Woody Plant ◽  
Night Temperature ◽  
Woody Plant Species ◽  
Short Day ◽  
Long Day ◽  
Euonymus Fortunei

Ten woody plant species were rooted during the summer with half of each species overwintered at 4°C (40°F) and half at 18°C (65°F) minimum night temperature. Half of the plants in each temperature regime received long day conditions while half received short day conditions. By May 1 all species except Snow azalea (Rhododendron obtusum ‘Snow’), Emerald'n Gold euonymus (Euonymus fortunei ‘Emerald 'n Gold’), and deutzia (Deutzia gracilis) had greater dry weights with the 18°C (65°F) long day regime. Deutzia was heavier under the 4°C (40°F) regime with no difference between photoperiod treatments. At 4°C (40°F) only Judd viburnum (Viburnum x juddii) was heavier with the long day regime. Plants grown until June 1, after two flushes of vegetative growth, showed less overwintering treatment effect, but Hetzi holly (Ilex crenata ‘Hetzi’), blue rug juniper (Juniperus horizontalis ‘Wiltoni’), crapemyrtle (Lagerstroemia indica ‘Centennial’), and Judd viburnum (Viburnum x juddii) were larger when grown under the 18°C (65°F) long day regime.

scholarly journals Variation in Floral Induction Requirements of Hibiscus sp.

2001 ◽  
Vol 126 (3) ◽  
pp. 262-268 ◽  
Author(s):  
Ryan M. Warner ◽  
John E. Erwin
Keyword(s):  
High Pressure ◽  
Air Temperature ◽  
Floral Induction ◽  
Ambient Light ◽  
Short Day ◽  
Long Day ◽  
Flower Diameter ◽  
Plant Form ◽  
Incandescent Lamps ◽  
Ornamental Species

Thirty-six Hibiscus L. species were grown for 20 weeks under three lighting treatments at 15, 20, or 25 ± 1.5 °C air temperature to identify flowering requirements for each species. In addition, species were subjectively evaluated to identify those species with potential ornamental significance based on flower characteristics and plant form. Lighting treatments were 9 hour ambient light (St. Paul, Minn., November to May, 45 °N), ambient light plus a night interruption using incandescent lamps (2 μmol·m-2·s-1; 2200 to 0200 hr), or ambient light plus 24-hour supplemental lighting from high-pressure sodium lamps (100 μmol·m-2·s-1). Five day-neutral, six obligate short-day, six facultative short-day, three obligate long-day, and one facultative long-day species were identified. Fifteen species did not flower. Temperature and lighting treatments interacted to affect leaf number below the first flower and/or flower diameter on some species. Hibiscus acetosella Welw. ex Hiern, H. cisplatinus St.-Hil., H. radiatus Cav., and H. trionum L. were selected as potential new commercially significant ornamental species.

EFFECTS OF GIBBERELLIC ACID ON GROWTH OF ANTIRRHINUM MAJUS ’UTAH WHITE’ IN A CARBON DIOXIDE-ENRICHED ENVIRONMENT

1968 ◽  
Vol 48 (6) ◽  
pp. 617-620 ◽  
Author(s):  
Te-sen Pih ◽  
E. W. Toop
Keyword(s):  
Carbon Dioxide ◽  
Gibberellic Acid ◽  
Block Design ◽  
Dry Weight ◽  
Antirrhinum Majus ◽  
Distilled Water ◽  
Fresh Weight ◽  
Water Control ◽  
Height Control ◽  
Randomized Block Design

Snapdragon seedlings (Antirrhinum majus ’Utah White’) were benched in two adjoining greenhouse compartments. A randomized-block design including three concentrations of gibberellic acid (GA3) and a distilled water control was employed in each compartment. Treatments were replicated three times. Treatment of snapdragon seedlings with GA3 significantly increased the length of inflorescences, the overall height of the plants at maturity and the fresh weight of the tops when the plants were grown in a carbon dioxide-enriched atmosphere. Treatment hindered root development and reduced chlorophyll content of leaves in relation to dry weight. Plants grown in an atmosphere containing 0.09% CO2 had longer inflorescences, were taller, had greater fresh weight and more chlorophyll at each level of treatment with GA3 than such plants grown in an atmosphere containing 0.03% CO2. However, these comparisons were considered significant only for total height (control) and fresh weight of tops (0, 10 and 50 μg/ml GA3). Whereas GA3 at 10 μg/ml reduced length of roots proportionally in both levels of CO2, higher concentrations of GA3 continued to give significant reduction only under the higher level of CO2.

Phenological development in two-row spring barley when grown in a long-day (Alberta, Canada) and a short-day (Western Australia, Australia) environment

2001 ◽  
Vol 81 (4) ◽  
pp. 621-629 ◽  
Author(s):  
B. H. Paynter ◽  
P. E. Juskiw ◽  
J. H. Helm
Keyword(s):  
Life Cycle ◽  
Western Australia ◽  
Vegetative Growth ◽  
Spring Barley ◽  
Stem Growth ◽  
Vegetative Phase ◽  
Late Flowering ◽  
Short Day ◽  
Long Day ◽  
Double Ridge

Phenological development in eight cultivars of two-row, spring barley (Hordeum vulgare L.) was examined when sown at two dates of seeding in two diverse environments. These environments were a short-day environment at Northam, Western Australia, Australia, in 1997 and a long-day environment at Lacombe, Alberta, Canada, in 1998. The Australian and Canadian barley cultivars used had different combinations of basic vegetative phase and daylength sensitivity. Barley grown at Lacombe reached each stage of phenological development in less time than at Northam. Most noticeable was a shorter duration of the period between seedling emergence to double ridge and between double ridge and awn emergence. At Northam, nearly 20% of the barley’s life cycle was spent on vegetative growth, just over 40% on ear/stem growth and close to 40% on grain filling. At Lacombe, barley spent nearly 55% of its life cycle filling grain and only 10% on vegetative growth and 35% on ear/stem growth. Later seeding accelerated all stages of development at Northam but only those stages until awn emergence at Lacombe. Late-sown barley at Lacombe took longer to reach physiological maturity. The relative contribution of each phase of crop growth was unaffected by date of seeding. Based on the time to awn emergence, Franklin was a very late flowering cultivar in both environments; Fitzgerald, Gairdner and Manley were late flowering; AC Oxbow and Harrington were mid-flowering; and Stirling was early flowering. Skiff was late flowering at North am but early flowering at Lacombe. Key words: barley (spring), phenological development, daylength sensitivity, basic vegetative phase

Germination and Maturation of Chenopodium humile L.

Weed Science ◽  
1970 ◽  
Vol 18 (3) ◽  
pp. 382-385 ◽  
Author(s):  
L. S. Jordan ◽  
V. A. Jolliffe
Keyword(s):  
Water Stress ◽  
Gibberellic Acid ◽  
Moderate Temperature ◽  
Laboratory Conditions ◽  
Short Day ◽  
Long Day ◽  
Growing Conditions

Chenopodium humile L. did not germinate under laboratory conditions while the pericarp was intact. Scarification, leaching, ethanol, gibberellic acid, and thiourea stimulated germination. Germination was enhanced by moderate temperature (30 C), and long days. Factors which stimulated germination shortened the time between planting and maturation under short-day conditions but did not promote flowering which was absent under long-day growing conditions. Water stress did not affect germination but hastened maturation.

Control of torpor and body weight patterns by a seasonal timer in Siberian hamsters

1989 ◽  
Vol 257 (1) ◽  
pp. R142-R149 ◽  
Author(s):  
T. J. Bartness ◽  
J. A. Elliott ◽  
B. D. Goldman
Keyword(s):  
Body Weight ◽  
Food Intake ◽  
Implant Removal ◽  
Daily Torpor ◽  
Short Day ◽  
Siberian Hamsters ◽  
Long Day ◽  
Preparatory Phase ◽  
Pelage Color ◽  
Seasonal Responses

Two experiments were designed to assess whether the short-day-induced patterns of shallow daily torpor, body weight, and other seasonal responses (food intake and pelage pigmentation) exhibited by Siberian hamsters (Phodopus sungorus sungorus) are under the control of a "seasonal timekeeping mechanism" that is independent of reproductive status [testosterone, (T)]. We examined whether the patterning and expression of these seasonal responses were altered by decreases in serum T that accompany gonadal regression during the first 8 wk of short-day exposure (i.e., the "preparatory phase" of the torpor season) or by experimental increases in serum T after this phase. Short-day-housed, castrated hamsters bearing T implants had long-day levels of the hormone and did not exhibit torpor. Appropriate seasonal patterns and levels of torpor, body weight, pelage color stage, and food intake were exhibited after T implant removal although serum T was clamped to long-day levels during the preparatory phase. In animals that were gonad intact during the preparatory phase and were subsequently castrated and given T implants, torpor did not occur as long as the implants were in place. However, the patterns and levels of daily torpor, food intake, and body weight rapidly returned to appropriate seasonal values compared with the castrated, blank-implanted controls on T implant removal; these effects occurred whether the T implants were removed when torpor frequency was increasing, at its peak, or decreasing across the torpor season. T did not affect pelage color stage under any condition.(ABSTRACT TRUNCATED AT 250 WORDS)

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