scholarly journals Internode Elongation of Rice Plant : IV. Effects of gibberellic acid at different stages of growth on the elongation of internode.

1972 ◽  
Vol 41 (4) ◽  
pp. 449-453 ◽  
Author(s):  
Kiyoshi TAKAHASHI ◽  
Kanoe SATO ◽  
Kiyoshi WADA
Keyword(s):  
Gibberellic Acid ◽  
Rice Plant ◽  
Internode Elongation ◽  
Stages Of Growth

Growth Regulator Herbicides Prevent Invasive Annual Grass Seed Production

2010 ◽  
Vol 3 (1) ◽  
pp. 12-16 ◽  
Author(s):  
Matthew J. Rinella ◽  
Marshall R. Haferkamp ◽  
Robert A. Masters ◽  
Jennifer M. Muscha ◽  
Susan E. Bellows ◽  
...  
Keyword(s):  
Plant Growth ◽  
Seed Production ◽  
Growth Regulators ◽  
Growth Regulator ◽  
Cereal Crops ◽  
Growth Stages ◽  
Internode Elongation ◽  
Annual Grass ◽  
Stages Of Growth ◽  
Late Growth

AbstractAuxinic herbicides, such as 2,4-D and dicamba, that act as plant growth regulators are commonly used for broadleaf weed control in cereal crops (e.g., wheat, barley), grasslands, and noncroplands. If applied at late growth stages, while cereals are developing reproductive parts, the herbicides can reduce seed production. We tested whether growth regulators have this same effect on the invasive annual grass Japanese brome. The herbicides 2,4-D, dicamba, and picloram were applied at typical field use rates to Japanese brome at various growth stages in a greenhouse. Picloram reduced seed production nearly 100% when applied at the internode elongation, boot, or heading stages of growth, whereas dicamba appeared to be slightly less effective and 2,4-D was much less effective. Our results indicate it may be possible to control Japanese brome by using growth regulator herbicides to reduce its seed production, thereby depleting its short-lived seed bank.

Response of Barley Shoot Apices to Application of Gibberellic Acid and Abscisic Acid: Dependence on Tissue Sensitivity

1978 ◽  
Vol 5 (5) ◽  
pp. 581 ◽  
Author(s):  
PB Nicholls
Keyword(s):  
Abscisic Acid ◽  
Gibberellic Acid ◽  
Acid Treatment ◽  
Apical Meristem ◽  
Internode Elongation ◽  
Shoot Apices ◽  
Tissue Sensitivity ◽  
Short Days ◽  
Gibberellic Acid Treatment ◽  
Acid Dependence

Stimulation by gibberellic acid of rachis internode elongation in barley grown in short days was dependent on either the timing of application or on the amount applied in a dose at day 10. There was no immediate rachis internode elongation in response to gibberellic acid treatment until floret initials appeared and then only if sufficient gibberellic acid was present in the shoot apices of the barley plants grown in short days. Applications of gibberellic acid promoted the growth of the double-ridge meristem (upper ridge only) and this resulted in a group of abnormal spikelets being formed on the lower six nodes of the inflorescence, all of which were characterized by enhanced growth of the rachilla apical meristem. In a 2 × 2 factorial experiment with gibberellic acid, abscisic acid was found to slightly reduce the growth rate of the vegetative barley apex between days 10 and 14. Abrupt cessation of primordium formation, coincident with the appearance of stamen initials, was observed following continued application of both gibberellic acid and abscisic acid whereas neither hormone alone had this effect. Enhanced growth of the rachilla apical meristem of the basal six spikelets following application of gibberellic acid resulted in the formation of branched inflorescences, and this result was not altered by the addition of abscisic acid to the treatment.

INTERNODE ELONGATION IN XANTHIUM PLANTS TREATED WITH GIBBERELLIC ACID PRESENTED IN TERMS OF RELATIVE ELEMENTAL RATES

1984 ◽  
Vol 71 (2) ◽  
pp. 239-244 ◽  
Author(s):  
Roman Maksymowych ◽  
Charlotte Elsner ◽  
Andrew B. Maksymowych
Keyword(s):  
Gibberellic Acid ◽  
Internode Elongation

Acid phosphatases of Ipomoea sp. cultured in vitro. 2. Influence of gibberellic acid on the formation of phosphatases

1980 ◽  
Vol 58 (20) ◽  
pp. 2171-2180 ◽  
Author(s):  
M.W. Zink
Keyword(s):  
Gibberellic Acid ◽  
Specific Activity ◽  
Soluble Fraction ◽  
Morning Glory ◽  
Original Strain ◽  
Acid Phosphatases ◽  
Developmental Patterns ◽  
Stages Of Growth ◽  
Repressive Effect

The levels and developmental patterns of the two acid phosphatases in the two strains of Ipomoea sp. (morning glory) grown in vitro are influenced differently by gibberellic acid (GA3). In the strain that requires a number of exogenously added hormones for growth (original strain), GA3 appears to show little effect on the specific activity of the phosphatases during the initial 3 days of growth but represses their levels in the growth medium, soluble and particulate fractions upon further growth. The repressive effect of both inorganic phosphate and GA3 on the enzymes appears to be additive. In the strain that does not require exogenously added hormones for growth (NH strain), the level of enzymes in the soluble fraction increases in the presence of GA3 during the early stages of growth and then decreases with culture age. GA3 also elevates the level of the enzymes in the particulate fraction over that in the controls. This elevation increases as phosphate level in the medium is increased. However, GA3 greatly decreases secretion, or leaching of the enzymes from the cells.

scholarly journals Studies on internode elongation in soybean plants. III. Effects of gibberellic acid on internode elongation.

1991 ◽  
Vol 60 (1) ◽  
pp. 15-19 ◽  
Author(s):  
Teruhisa UMEZAKI ◽  
Itaru SHIMANO ◽  
Shigeo MATSUMOTO
Keyword(s):  
Gibberellic Acid ◽  
Internode Elongation ◽  
Soybean Plants
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