scholarly journals Physiological Effects of Gibberellic Acid. IX. Recovery of Gibberellic Acid Following Incubation with Endosperm

1967 ◽  
Vol 42 (3) ◽  
pp. 445-449 ◽  
Author(s):  
L. G. Paleg ◽  
B. G. Coombe
Keyword(s):  
Gibberellic Acid ◽  
Physiological Effects

scholarly journals PHYSIOLOGICAL CHANGES ASSOCIATED WITH LEAF SENESCENCE IN EASTER LILIES

HortScience ◽  
1995 ◽  
Vol 30 (2) ◽  
pp. 189a-189
Author(s):  
Rosanne E. Franco ◽  
Susan S. Han
Keyword(s):  
Gibberellic Acid ◽  
Leaf Senescence ◽  
Growth Regulators ◽  
Cold Storage ◽  
Foliar Application ◽  
Lilium Longiflorum ◽  
Continuous Treatment ◽  
Physiological Effects ◽  
Easter Lily ◽  
The Individual

Senescence of lower leaves of Easter lilies (Lilium longiflorum Thunb.) was previously shown to be delayed with application of the growth regulators, gibberellic acid (GA3) and benzyladenine (BA). This study was done to determine the physiological effects of GA3 and BA in relation to the delay of leaf senescence. Foliar application with 500 ppm BA or GA3 delayed chlorosis and lowered respiration rate in Easter lily leaves. A combination of 500 ppm BA and 500 ppm GA3 was more effective than the individual application of each. Gibberellic acid, BA, or their combination before cold storage resulted in delayed chlorosis and lowered respiration following removal from cold storage. Treatment with growth regulators after cold storage was less effective. Senescence of leaves was not associated with ethylene since ethylene production by leaves was undetectable by gas chromatograph. In addition, pulsing or continuous treatment with silver thiosulphate (STS), an inhibitor of ethylene synthesis, did not delay foliar chlorosis. Analysis of carbohydrate levels in Easter lily leaves treated with GA3, BA, or their combination may contribute to the understanding of the physiological effects of these two growth regulators.

scholarly journals Physiological effects of gibberellic acid. V. Endosperm responses of barley, wheat, & oats

1962 ◽  
Vol 37 (6) ◽  
pp. 798-803 ◽  
Author(s):  
L. G. Paleg ◽  
B. G. Coombe ◽  
M. S. Buttrose
Keyword(s):  
Gibberellic Acid ◽  
Physiological Effects

scholarly journals Physiological Effects of Gibberellic Acid. VI. Other Gibberellins in Three Test Systems

1964 ◽  
Vol 39 (2) ◽  
pp. 286-290 ◽  
Author(s):  
L. Paleg ◽  
D. Aspinall ◽  
B. Coombe ◽  
P. Nicholls
Keyword(s):  
Gibberellic Acid ◽  
Physiological Effects ◽  
Test Systems

scholarly journals Electrolyte Leakage and Protoplasm Viability of Pummelo Mesocarp Tissue as Influenced by Exogenous GA3

1990 ◽  
Vol 115 (4) ◽  
pp. 592-597 ◽  
Author(s):  
Kurt D. Nolte ◽  
Eugene A. Nothnagel ◽  
Charles W. Coggins
Keyword(s):  
Gibberellic Acid ◽  
Electrolyte Leakage ◽  
Fluorescein Diacetate ◽  
Physiological Effects ◽  
Citrus Fruits ◽  
Cellular Membranes ◽  
Isolated Protoplasts ◽  
Citrus Maxima ◽  
Over Time

Studies were conducted to determine whether certain physiological effects of gibberellic acid (GA3) on the peel of citrus fruits may be attributed to GA3 interaction with cellular membranes. Excised mesocarp tissue from pummelo [Citrus maxima (Burm.) Merrill] fruits was analyzed for electrolyte and K+ release over time in varying concentrations of GA3. Electrolyte leakage and K+ efflux was significantly reduced (up to 30%) when tissue was incubated in the presence of GA3. GA3 improved the viability of mechanically isolated protoplasts during 72 hr of storage at 7C, as shown by the use of fluorescein diacetate. These results suggest that some of the GA3-elicited responses in citrus fruits may be membrane related.

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