Effect of growth regulators and dormancy-breaking chemicals on bud break and yield of ‘Palomino’ grape vines

1977 ◽  
Vol 5 (4) ◽  
pp. 339-343
Author(s):  
M. E. Hopping
Keyword(s):  
Growth Regulators ◽  
Bud Break ◽  
Dormancy Breaking

scholarly journals Assessment of In-vitro culture through Nodal explants of Dendrocalamus hamiltonii

2021 ◽  
Vol 2 (1) ◽  
pp. 130-133
Author(s):  
Abha Jha ◽  
◽  
Sunila Das ◽  
Keyword(s):  
Experimental Study ◽  
Growth Regulators ◽  
In Vitro Regeneration ◽  
Shoot Multiplication ◽  
Growth Hormones ◽  
Nodal Explants ◽  
Bud Break ◽  
Multiplication Rate ◽  
Dendrocalamus Hamiltonii

The present experimental study was aimed to overcome the traditional methods of propagation that limit the number of propagules by in-vitro regeneration through nodal explants of Dendrocalamus hamiltonii with a comparative study of growth regulators during the shooting and rooting process. Dendrocalamus hamiltonii is distributed from the Himalayas (Nepal) to the northern part of Burma. Collection of explants was done from different selected sites of CPTs. There was the use of HgCl2 and Ca (OCl)2 as sterilizing agents in different concentrations and its effect was visualized during the sprouting stage. Culm explants were cultured in a bottle containing White media (Wm) supplemented with BA and Kinetin for sprouting and IAA, IBA, NAA for rooting. There is also the use of IAA+IBA+NAA in combined form as a supplementary solution 0.1% HgCl2 treatment for 20-minute results into77.80% aseptic buds and 72% bud -break. Among the used growth-hormones, BA with concentration 0.25mg/l and 0.50mg/l respectively were appropriate for shoot-multiplication rate, 4.01±0.3 and 4.3±0.4 were ideal observation incorporation with BA (1.00mg/l) and BA (1.50mg/l) respectively. Maximum sprouting rate14.77±3.37with application of BA (2.00mg/l) and maximum shoot length4.3±0.4 is observed at BA (1.50mg/l). The applications of rooting hormone IAA+IBA+NAA in the concentration of 1.0 mg/l results in 72.5±0.3(rooting) and 11.1±0.3 (av. No. of the root).

scholarly journals PRE-FORCING TREATMENTS AND PLANT GROWTH REGULATORS IN THE FORCING SOLUTION PROMOTE MACRO- AND MICRO-PROPAGATION OF WOODY PLANT SPECIES

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1124d-1124
Author(s):  
Gouchen Yang ◽  
Paul E. Read
Keyword(s):  
Plant Growth ◽  
Plant Growth Regulators ◽  
Plant Species ◽  
Growth Regulators ◽  
Woody Plant ◽  
Shoot Proliferation ◽  
Bud Break ◽  
Woody Plant Species ◽  
Forcing Solution

BA, IBA and GA3 were incorporated into softwood tissues to be cultured in vitro or rooted as cuttings by adding the plant growth regulators (PGR) at various concentrations to a forcing solution containing 200 mg/l 8-hydroxyquinoline citrate and 2% sucrose. BA and GA3 helped break bud dormancy in autumn-collected stems and increased percent bud-break. IBA inhibited bud break and shoot elongation. Rooting of forced softwood cuttings was enhanced by IBA in the forcing solution, while GA3 inhibited the rooting of plant species tested. When dormant stems were forced with periodic additions of BA (10 mg/l) in the forcing solution, in vitro shoot proliferation was enhanced. However, inclusion of GA3 in the forcing solution reduced shoot proliferation. A pre-forcing NaOCl soak and a pre-forcing treatment with wetting agents accelerated bud break, size and number of shoots available for both micro- and macro-propagation of the woody plant species tested. The forcing solution protocol described is an effective PGR delivery system and it can be used by the propagator to extend the season for obtaining softwood growth suitable for use as in vitro explants or softwood cuttings.

scholarly journals In-vitro Conservation of Bacopa monniera (L.) Wettst.: A Memory Booster Plant

Our Nature ◽  
1970 ◽  
Vol 8 (1) ◽  
pp. 40-47 ◽  
Author(s):  
J. Prabha ◽  
U. Rani ◽  
A. Sen ◽  
R.N. Verma ◽  
A. Batra
Keyword(s):  
Growth Regulators ◽  
High Frequency ◽  
In Vitro Propagation ◽  
Shoot Proliferation ◽  
Nodal Segment ◽  
Bud Break ◽  
Ms Medium ◽  
Bacopa Monniera ◽  
In Vitro Shoot Regeneration

A mass in-vitro propagation system of Bacopa monniera (L.) Wettst., a traditional medicinal herb, has been developed. Shoot proliferation and growth were greatly influenced by the months of the year during which the explant were collected. High frequency bud break coupled with maximum number of shoots through nodal segment were found in the month of June and August. Of the different growth regulators tried, for in vitro shoot regeneration, MS medium with BAP (1.0 mg/l) induced maximum number of proliferative shoots (65.00±1.453). Multiplication and elongation of the shoots were obtained after regular sub culturing on the same medium after 15-21 days. Rooting from basal end of the shoots occurred on MS medium with the addition of IBA (0.5 mg/l). After a hardening phase of 4 weeks, almost 95% transplantation was success in the field.DOI: 10.3126/on.v8i1.4311

scholarly journals Hot Water Treatment Released Endodormancy but Reduced Number of Flowers in Potted Red Raspberry Plants

HortScience ◽  
2010 ◽  
Vol 45 (6) ◽  
pp. 894-898 ◽  
Author(s):  
Marja Rantanen ◽  
Pauliina Palonen
Keyword(s):  
Water Treatment ◽  
Dry Weight ◽  
Rubus Idaeus ◽  
Hot Water ◽  
Bud Break ◽  
Hot Water Treatment ◽  
Dormancy Breaking ◽  
Red Raspberry ◽  
Hydrogen Cyanamide ◽  
Sublethal Stress

Partially released dormancy causes poor and uneven bud break in temperate plant species like red raspberry (Rubus idaeus L.). Insufficient chilling may be a problem when raspberries are grown at southern latitudes and in year-round production. Dormancy may be released by sublethal stress in many species. We studied the effect of sublethal stress on endodormancy in red raspberry ‘Glen Ample’ and ‘Ottawa’. Canes growing in pots were treated with either hot water (45 °C, 1 h) or the dormancy-breaking chemical, hydrogen cyanamide (1.04%), after accumulation of 0, 240, 480, 720, 960, or 1200 h of chilling at 1 °C. Bud break, vegetative growth, and number of flowers were recorded during 12 weeks of greenhouse forcing after the treatments. Chilling increased bud break, growth, and dry weight of lateral shoots and number of flowers in both cultivars. During deepest endodormancy (0 and 240 h of chilling), treatment with either hot water or hydrogen cyanamide enhanced bud break and lateral shoot growth but could not completely replace chilling. In ‘Ottawa’, hydrogen cyanamide was more effective than hot water during deepest endodormancy, but hot water treatment broke dormancy effectively when 720 h of chilling had accumulated. For ‘Glen Ample’, hot water was as effective as hydrogen cyanamide in breaking endodormancy. Hot water treatment reduced the number of flowers in ‘Glen Ample’ during late endodormancy (720, 960, and 1200 h of chilling). The chilling requirement for ‘Ottawa’ was fulfilled between 720 and 960 h of chilling. However, in ‘Glen Ample’, 1200 h of chilling was not enough to fully release bud dormancy; bud break remained low and it was increased by dormancy-breaking treatments. Hot water treatment can be used to release endodormancy in raspberries, but treatment conditions need to be optimized to preserve crop potential. Chemical name used: hydrogen cyanamide (Dormex, Hi-Cane, Morgrapes).

scholarly journals Use of Hormones and Growth Regulators in Quantifying Bud Dormancy

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 908C-908
Author(s):  
Miklos Faust
Keyword(s):  
Growth Regulators ◽  
Apical Dominance ◽  
Bound State ◽  
The State ◽  
Bud Dormancy ◽  
Central Portion ◽  
Dormancy Breaking ◽  
Dormant Period ◽  
Lateral Buds ◽  
Terminal Buds

At the beginning and near to the end of the endodormant period, cytokinin-type growth regulators are effective to end dormancy in apple. The same growth regulators are not effective during the middle of this period. Terminal buds require less chilling than lateral buds to emerge from the dormant period. Lateral buds on decapitated shoots also require less chilling, indicating that auxin may be involved in dormancy. Replacing the terminal with IAA keeps water in bound state in the lateral buds, indicating the effect of IAA in dormancy. We have developed the theory that the beginning and the end of the winter-dormant period is governed by apical dominance. It appears that only this period can be manipulated either with dormancy avoidance methods or with dormancy-breaking chemicals. The central portion of the dormant period is not subject to manipulation. Therefore, it is important that the depth of the dormancy is quantified. Certain growth regulators can be used for determining the state of bud dormancy. Thidiazuron gives results within 2 to 4 days.

scholarly journals Breaking seed dormancy of Tulipa scardica Bornm. and Tulipa kosovarica Kit Tan, Shuka & Krasniqi by pre-chilling, plant growth regulators and some chemical treatments

2019 ◽  
Vol 113 (2) ◽  
pp. 203 ◽  
Author(s):  
Bekim GASHI ◽  
Mirsade OSMANI ◽  
Sali ALIU
Keyword(s):  
Sulfuric Acid ◽  
Plant Growth ◽  
Gibberellic Acid ◽  
Plant Growth Regulators ◽  
Growth Regulators ◽  
Potassium Nitrate ◽  
Germination Percentage ◽  
Dormancy Breaking ◽  
Germination Time ◽  
Mean Germination Time

<p><em>Tulipa scardica</em> and <em>T. kosovarica</em> are rare, endemic and endangered plants in Kosovo. This research was carried out to study the dormancy breaking treatment in Tulipa scardica and T. kosovarica seeds by pre-chilling and various concentration of potassium nitrate (KNO3), gibberellic acid (GA3), kinetin, thiourea and sulfuric acid (H2SO4). The experiment was conducted with untreated seeds (without stratification) and with stratified seeds (8 weeks) and treated with different concentration of some chemicals and plant growth regulators. Results showed that the final germination percentage (FGP) of seeds without stratification at both Tulipa plant species was zero, while germination was enhanced by pre-chilling (stratification) especially after treatment of these seeds by above mentioned treatments. Both Tulipa species showed an increase in mean germination time (MGT), an indication of slower germination, as different chemicals or plant growth regulators increased. Depending on treatments, germination was ranging from 80 % to 90 %, the maximum germination was detected in seeds treated with KNO3, GA3, and their combination, while the minimum germination in seeds without treatments and treated with thiourea. The conservation of these plants in botanic gardens by cultivation or propagation for commercial use as ornamental plants could give an effective contribution to the conservation of these plants.<br />Abbreviations: KNO<sub>3 </sub><strong>– </strong>potassium  nitrate; GA<sub>3 </sub>- gibberellic acid; H<sub>2</sub>SO<sub>4</sub> – sulfuric acid; FGP – final germination percentage; MGT – mean germination time<br /><br /></p>

scholarly journals Metabolic Changes in Polyamines, Phenylethylamine, And Arginine During Bud Break in Apple Flower Buds Under Foliar-Applied Dormancy-Breaking Agents

2018 ◽  
pp. 1-18 ◽  
Author(s):  
Mostafa M. Rady ◽  
Mohamed A. Seif El-Yazal
Keyword(s):  
Biogenic Amines ◽  
Maximum Yield ◽  
Calcium Nitrate ◽  
Metabolic Changes ◽  
Bud Dormancy ◽  
Bud Break ◽  
Bud Burst ◽  
Dormancy Breaking ◽  
Apple Variety ◽  
Early Date

The Environmental and climatic conditions affect the flower bud growth, flowering and yield performance of fruit species. Temperature appears to be important factors for temperate fruit trees in mild climates. The relationships between breaking bud dormancy and climatic influences on flowering, growth and metabolic changes in contents of biogenic amines (spermine, spermidine, putrescine, cadaverine and phenylethylamine), arginine and anthocyanin before and after bud break were evaluated for "Ain Shemer" apple (Malus sylvestris, Mill) trees under exogenously applied hydrogen cyanamide (dormex), calcium nitrate Ca(NO3)2 and thiourea. The studies have shown that breaking bud dormancy (as early date of bud break and percentage of bud break) by the above dormancy breaking agents were correlated with the high content of biogenic amines and arginine in buds. Seasonal variations in biogenic amines, arginine and anthocyanin level were present in buds during the research period (dormancy and dormancy release period). Levels of spermine, spermidine, putrescine, cadaverine, phenylethylamine, arginine and anthocyanin have simultaneously risen with bud burst and new growth. The most abundant polyamines in buds were cadaverine followed by spermine. The best results were obtained with Dormex after exposure the trees to about 274 natural chilling hours ? +7.2oC; therefore, we recommend using this compound to achieve bud break as early as possible in "Ain Shemer" apple variety by regulating the contents of biogenic amines and arginine in buds and subsequently the high percentages of bud break and maximum yield.

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