INFLUENCE OF GIBBERELLIC ACID ON THE NICOTINE CONTENT OF CIGAR TOBACCO

1959 ◽  
Vol 39 (1) ◽  
pp. 48-55 ◽  
Author(s):  
E. V. Parups
Keyword(s):  
Gibberellic Acid ◽  
Tobacco Leaves ◽  
Nicotine Content ◽  
Greenhouse Experiments ◽  
Leaves And Roots ◽  
Effect On Yield

Treatment of tobacco with gibberellic acid in field and greenhouse experiments had little effect on yield of leaves but decreased the nicotine content of both leaves and roots. It is postulated that the decrease of nicotine content in the tobacco leaves resulted from a change in the metabolism of roots caused by gibberellic acid applications.

Cloning and expression of distinct nitrite reductases in tobacco leaves and roots

1993 ◽  
Vol 236-236 (2-3) ◽  
pp. 203-208 ◽  
Author(s):  
Jocelyne Kronenberger ◽  
Andrée Lepingle ◽  
Michel Caboche ◽  
Hervé Vaucheret
Keyword(s):  
Cloning And Expression ◽  
Tobacco Leaves ◽  
Nitrite Reductases ◽  
Leaves And Roots

scholarly journals INFLUENCE OF GIBBERELLIC ACID AND FUNGICIDE EXPERIMENTS ON YIELD, QUALITY AND DISEASE CONTROL OF `CHENIN BLANC' GRAPES IN -SOUTHEAST TEXAS.

HortScience ◽  
1990 ◽  
Vol 25 (8) ◽  
pp. 852f-852
Author(s):  
Iva Suzanne Wilson ◽  
George Ray McEachern ◽  
J Dan Hanna
Keyword(s):  
Gibberellic Acid ◽  
Disease Control ◽  
Southeast Texas ◽  
Yield Quality ◽  
Bunch Rot ◽  
Effect On Yield ◽  
And Control ◽  
Chenin Blanc

Gibberellic acid and fungicide experiments were conducted in 1988 and 1989 to examine their effect on yield, quality and disease control of 'Chenin Blanc' grapes in Southeast Texas. Gibberellic acid applied 7 and 14 days prior to bloom at 2.5 and 5.0 ppm reduced the number of berries per cluster in 1988 and 1989. The 2.5 ppm rate reduced berries and increased yield. The GA treatments also reduced bunch rot at harvest. Benomyl + Manzate fungicide treatments were superior to Nova and control in reducing bunch rot.

scholarly journals Influence of Girdling and Gibberellic Acid on Yield Components, Fruit Composition, and Vestigial Seed Formation of `Sovereign Coronation' Table Grapes

HortScience ◽  
2004 ◽  
Vol 39 (3) ◽  
pp. 541-544 ◽  
Author(s):  
Andrew G. Reynolds ◽  
Christiane de Savigny
Keyword(s):  
Gibberellic Acid ◽  
Transpiration Rate ◽  
Yield Components ◽  
Untreated Control ◽  
Titratable Acidity ◽  
Seed Formation ◽  
Table Grapes ◽  
Fruit Composition ◽  
Fruit Maturity ◽  
Effect On Yield

Vestigial seeds of `Sovereign Coronation' table grapes frequently form partial seedcoats that are perceptible during consumption. This problem was addressed through cane/cordon girdling and gibberellic acid (GA3) sprays. `Sovereign Coronation' vines were subjected to one of five treatments [untreated control; cane/cordon girdled; 15 ppm GA3 at bloom (GA1); GA1 + 40 ppm GA3 14 days later (GA2); GA2 + 40 ppm GA3 14 days later]. GA3 had no effect on yield or clusters per vine, but postbloom GA3 treatments increased cluster and berry weights and reduced berries per cluster. Fruit maturity was not consistently affected by the treatments, although slight increases in °Brix and pH and decreases in titratable acidity (TA) were associated with postbloom GA3 treatments. Use of postbloom GA3 applications reduced the number and weight of vestigial seeds with developed seedcoats, and reduced the number and weight of undeveloped seeds as well in 2 of 3 years. Girdling increased cluster and berry weights, decreased °Brix and TA, and increased pH. Transpiration rate of leaves on girdled vines was also higher than control vines on one sampling date. Data suggest that use of bloom and postbloom GA3 applications to `Sovereign Coronation' may reduce the formation of perceptible vestigial seeds and thus improve the marketability of this cultivar.

Regulation of starch and sugar levels in tobacco leaves by gibberellic acid

1969 ◽  
Vol 47 (10) ◽  
pp. 1595-1598 ◽  
Author(s):  
T. T. Lee ◽  
N. Rosa
Keyword(s):  
Gibberellic Acid ◽  
Reducing Sugars ◽  
Amylase Activity ◽  
Leaf Tissue ◽  
Tobacco Plants ◽  
Tobacco Leaves ◽  
Green Leaves ◽  
Specific Activities ◽  
Sugar Levels ◽  
Hydrolysis Of

Gibberellic acid (GA3) significantly reduced the level of starch in green leaves of tobacco plants. The total α-amylase activity and the specific activities of α-amylase and invertase were increased by GA3 treatment. Hydrolysis of starch during flue-curing contributed greatly to the increased level of reducing sugars in cured leaf tissue; decreasing the level of starch in green leaves by GA3 effectively lowered the level of reducing sugars after curing.

Using leaf spectral reflectance to monitor the effects of shading on nicotine content in tobacco leaves

2013 ◽  
Vol 51 ◽  
pp. 444-452 ◽  
Author(s):  
Fangfang Jia ◽  
Guoshun Liu ◽  
Songshuang Ding ◽  
Yongfeng Yang ◽  
Yunpeng Fu ◽  
...  
Keyword(s):  
Spectral Reflectance ◽  
Tobacco Leaves ◽  
Nicotine Content ◽  
Leaf Spectral Reflectance

scholarly journals Foliar-applied GA3 Advances Fruit Maturity and Allows Off-season Harvest of ‘Hass’ Avocado

HortScience ◽  
2007 ◽  
Vol 42 (2) ◽  
pp. 257-261 ◽  
Author(s):  
Samuel Salazar-García ◽  
Luis E. Cossio-Vargas ◽  
Isidro J.L. González-Durán ◽  
Carol J. Lovatt
Keyword(s):  
Gibberellic Acid ◽  
Foliar Application ◽  
Fruit Size ◽  
Inflorescence Development ◽  
Avocado Fruit ◽  
Negative Effect ◽  
Effect On Yield ◽  
Hass Avocado ◽  
Vegetative And Reproductive Growth ◽  
Prohexadione Calcium

Michoacán and Nayarit are, respectively, the largest and second largest avocado-producing states in Mexico. The main harvest of the ‘Hass’ avocado in both states is concentrated during November to December, which saturates the market and reduces the price of fruit and grower income. The goal of this research was to manipulate vegetative and reproductive growth of the ‘Hass’ avocado with properly timed foliar-applied plant bioregulators (PBRs) to shift the date of flowering and harvest to the period before or after the main harvest. Effects of canopy sprays of gibberellic acid (GA3) or prohexadione calcium (a gibberellic acid biosynthesis inhibitor) applied at different stages of tree phenology on inflorescence development, time of anthesis, date of legal maturity for harvest of ‘Hass’ avocado fruit, yield, and fruit size were quantified. No PBR treatment influenced the time of anthesis. A single or double foliar application of GA3 (50 mg·L−1) ≈4 months (July) before the expected date of main harvest (November) resulted in ‘Hass’ avocado fruit reaching legal maturity (mesocarp dry matter 21.5% or greater) 24.8 to 28.2 d earlier than those of untreated control trees with no negative effect on yield or fruit size.

Effect of amount and time of application of nitrogen on the nicotine content of tobacco leaves

1977 ◽  
Vol 17 (86) ◽  
pp. 469
Author(s):  
RH Crockford
Keyword(s):  
Root System ◽  
Leaf Position ◽  
Split Application ◽  
Tobacco Plants ◽  
Tobacco Leaves ◽  
Nicotine Content ◽  
Time Of Application ◽  
Nitrogenous Fertilizer

The nicotine content of tobacco plants was found to be influenced by both the amount of nitrogenous fertilizer and the method of application. Split applications, with the second portions being applied between 34 and 46 days after planting substantially increased leaf nicotine levels. The later the second portion was applied the more marked was the effect. The magnitude of the effect was slightly negative in the lowest leaves and increased with ascending leaf position to the top group, where increases in excess of 100 per cent occurred. The split application treatments slightly reduced the size of the plant, but did not affect the weight of the root system.

Effects of drying pretreatment and particle size adjustment on the composting process of discarded flue-cured tobacco leaves

2017 ◽  
Vol 35 (5) ◽  
pp. 534-540 ◽  
Author(s):  
Gui-Hong Zhao ◽  
Yan-Ling Yu ◽  
Xiang-Tong Zhou ◽  
Bin-Yu Lu ◽  
Zi-Mu Li ◽  
...  
Keyword(s):  
Particle Size ◽  
Tobacco Leaves ◽  
Nicotine Content ◽  
Composting Process ◽  
Mature Compost ◽  
Nitrogen Ratio ◽  
Nicotine Level ◽  
Chemical Conditions ◽  
Physical And Chemical ◽  
Size Adjustment

The main characteristic of discarded flue-cured tobacco leaves is their high nicotine content. Aerobic composting is an effective method to decrease the nicotine level in tobacco leaves and stabilize tobacco wastes. However, high levels of nicotine in discarded flue-cured tobacco leaves complicate tobacco waste composting. This work proposes a drying pretreatment process to reduce the nicotine content in discarded flue-cured tobacco leaves and thus enhance its carbon-to-nitrogen ratio to a suitable level for composting. The effect of another pretreatment method, particle size adjustment, on composting efficiency was also tested in this work. The results indicated that the air-dried (nicotine content: 1.35%) and relatively long discarded flue-cured tobacco leaves (25 mm) had a higher composting efficiency than damp (nicotine content: 1.57%) and short discarded flue-cured tobacco leaves (15 mm). When dry/25 mm discarded flue-cured tobacco leaves mixed with tobacco stems in an 8:2 ratio was composted at a temperature above 55 °C for 9 days, the nicotine content dropped from 1.29% to 0.28%. Since the discarded flue-cured tobacco leaves was successfully composted to a fertile and harmless material, the germination index values increased to 85.2%. The drying pretreatment and particle size adjustment offered ideal physical and chemical conditions to support microbial growth and bioactivity during the composting process, resulting in efficient conversion of discarded flue-cured tobacco leaves into a high quality and mature compost.

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