Role of gibberellic acid in tomato defence against potato purple top phytoplasma infection

2012 ◽  
Vol 162 (2) ◽  
pp. 191-199 ◽  
Author(s):  
Y. Ding ◽  
W. Wei ◽  
W. Wu ◽  
R.E. Davis ◽  
Y. Jiang ◽  
...  
Keyword(s):  
Gibberellic Acid ◽  
Phytoplasma Infection ◽  
Potato Purple Top

The role of gibberellic acid in the hydrolysis of endosperm reserves in Zea mays

Planta ◽  
1974 ◽  
Vol 121 (1) ◽  
pp. 67-74 ◽  
Author(s):  
B. M. R. Harvey ◽  
Ann Oaks
Keyword(s):  
Zea Mays ◽  
Gibberellic Acid ◽  
Hydrolysis Of

A basic peroxidase isoenzyme from the grape pedicel is induced by gibberellic acid

1999 ◽  
Vol 26 (4) ◽  
pp. 387 ◽  
Author(s):  
Francisco J. Pérez ◽  
Verónica Morales
Keyword(s):  
Ascorbic Acid ◽  
Gibberellic Acid ◽  
Peroxidase Activity ◽  
Hormone Treatment ◽  
Table Grape ◽  
Guaiacol Peroxidase ◽  
Peroxidase Isoenzymes ◽  
Peroxidase Isoenzyme ◽  
Soluble Peroxidase

Soluble peroxidase activity from pedicels of seedless table grape cv. Sultana was highly stimulated by post-bloom applications of gibberellic acid (GA3) to vines. The increase in peroxidase activity was mainly due to the induction of a basic peroxidase isoenzyme (pI > 9; BPrx-HpI). The activity of two other peroxidase isoenzymes of pI 6.5 and 3.2 was not altered by the hormone treatment. BPrx-HpI was induced by GA3 in pedicels and rachis but not in berries, although in berries peroxidase activity was also stimulated by post-bloom GA3 applications. BPrx-HpI oxidised guaiacol and ortho-phenylenediamine (o-PDA), while the others peroxidases found in the pedicel and in the berry oxidised only o-PDA. Hence, BPrx-HpI was characterised as a guaiacol-peroxidase showing no activity towards ascorbic acid (ASC). The possible role of BPrx-HpI in pedicel lignification and berry-drop caused by GA3 applications to cv. Sultana vines is discussed.

scholarly journals The Role of Testosterone and Gibberellic Acid in the Melanization of Cryptococcus neoformans

2020 ◽  
Vol 11 ◽  
Author(s):  
Jamila S. Tucker ◽  
Tiffany E. Guess ◽  
Erin E. McClelland
Keyword(s):  
Gibberellic Acid ◽  
Cryptococcus Neoformans

scholarly journals Role of the Seed Coat in Dormancy of Eucalyptuspauoiflora and E. Delegatensis Seeds

1967 ◽  
Vol 20 (6) ◽  
pp. 1237 ◽  
Author(s):  
EP Bachelard
Keyword(s):  
Gibberellic Acid ◽  
Seed Coat ◽  
Gaseous Exchange ◽  
Eucalypt Species ◽  
Phacelia Tanacetifolia

Gibberellic acid promotes the germination of dormant seeds of some eucalypt species including Eucalyptus pauciflora Sieb. and E. delegatensis R. T. Baker. It was suggested that gibberellic acid may stimulate germination by promoting enzymatic weakening of the seed coat (Bachelard 1967) as described for Phacelia tanacetifolia seeds (Chen and Thimann 1964). Previously, Grose (1963) suggested dormancy of of E. delegatensis seeds might be due to the seed coat limiting gaseous exchange.

Role of gibberellic acid in cotton fibre development

2002 ◽  
Vol 138 (3) ◽  
pp. 255-260 ◽  
Author(s):  
S. J. GOKANI ◽  
V. S. THAKER
Keyword(s):  
Gibberellic Acid ◽  
Fibre Length ◽  
Dry Weight ◽  
Cotton Fibre ◽  
Growth Phases ◽  
Fibre Development ◽  
The Media

Fibres of three cotton cultivars (Gossypium hirsutum H-4, H-8 and G. arboreum G. Cot-15) were analysed for growth in terms of fibre length and dry weight and endogenous gibberellic acid (GA3) content thrice during 1997–2000, at Rajkot. The development of cotton fibre was divided into four distinct growth phases but overlap between elongation and secondary thickening was considerable which suggests that both these phases are independent of each other. During fibre elongation, GA3 content remained low and increased after a decrease in the rate of fibre elongation in all three genotypes. The long staple cultivar (H-4) showed highest endogenous GA3 content followed by the middle one (H-8) and the short staple cultivar (G. Cot-15). In in vitro studies when GA3, NAA or GA3+NAA was supplemented to the media, increase in fibre length of the short staple cultivar was maximum, followed by the middle one and the long staple cultivar. Both in vivo and in vitro findings suggest that GA3 is one of the important factors that determine fibre length.

Role of other plant organs in gibberellic acid-induced delay of leaf senescence in alstroemeria cut flowers

1993 ◽  
Vol 87 (3) ◽  
pp. 426-432 ◽  
Author(s):  
W. Jordi ◽  
H. M. Dekhuijzen ◽  
G. M. Stoopen ◽  
J. H. M. Overbeek
Keyword(s):  
Gibberellic Acid ◽  
Leaf Senescence ◽  
Cut Flowers ◽  
Plant Organs

THE ROLE OF GIBBERELLIC ACID AND GIBBERELLIN-LIKE SUBSTANCES IN THE DORMANCY OF THE CRANBERRY

1972 ◽  
Vol 52 (3) ◽  
pp. 263-271 ◽  
Author(s):  
F. C. EADY ◽  
G. W. EATON
Keyword(s):  
Gibberellic Acid ◽  
Vegetative Growth ◽  
Vaccinium Macrocarpon ◽  
Flower Bud ◽  
Bud Development ◽  
Terminal Buds ◽  
Flower Bud Development

The role of applied gibberellic acid (GA3) and endogenous gibberellins in the dormancy requirement of the cranberry Vaccinium macrocarpon Ait. cult McFarlin was investigated. Application of GA3 to unchilled dormant plants resulted in only vegetative growth of the terminal buds. Extraction and bioassay of gibberellin-like substances from both terminal buds and leaves during the 1969–70 season indicate a translocation of these substances from leaves to terminal buds between March 9 and April 6. This coincided with the time of elongation of the terminal buds in the field. The timing of this translocation suggests that these gibberellin-like substances do not play an important role in flower-bud development at this stage.

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