Effects of Gibberellin

Table II. Effect of Gibberellin Concentration in Mixture on Enzyme Formation...

The discovery of the effects of gibberellin on flower formation is closely linked 1 with older studies on the physiology of this process, particularly its regulation by certain external or environmental factors. 

Figure 1. Effect of gibberellin on flowering in carrot (variety Early French Forcing), a cold-requiring plant (24)...

Studies reported herein are primarily concerned with the effects of gibberellin in extending the staminate stage of monoecious cucumbers and with the formation of staminate flowers on gynoecious cucumbers. 

Photoperiod enhances the promotive effect of gibberellin on staminate flower formation in the gynoecious cucumber not by increasing the number of nodes which... 

Table V Effect of Gibberellin and Photoperiod on Promotion of Staminate Flower Formation on Gynoecious Cucumber (MSU 713-5)...

The promotion of staminate flower formation in cucumbers by gibberellin is not surprising if one considers the effects of gibberellin as similar to those of a long photoperiod. Extension of the staminate stage in monoecious cucumbers by gibber-... 

Lang, A. (1957). Effect of gibberellin upon flower formation. Proc. Natl. Acad. Sci. USA 43,709-717. 

Cotyledon Expansion. Cotyledon expansion is markedly stimulated by GA and by BR as well, but to a lesser extent the activity is about 1/100 that of GA4. On the other hand, IAA has practically no effect Dark-grown cucumber cotyledons have also been shown to expand when subjected to BR treatment (6). Since expansion of cotyledons and leaves of intact seedlings is a normal effect of gibberellin, in this case BR acts like gibberellin. 

Some biological effects of gibberellins. The involvement of other hormones is indicated as (+) if the hormone... 

Many of the above-described effects of gibberellins on orientation and stability of CMTs are suspected to be regulated by unidentified protein kinases because their inhibitors (such as 6-dimethylaminopurine and okadaic acid) abolish the gibberellin-mediated growth responses [48,130]. Inhibition of protein kinase activity also prevented developmentally related changes in an isoform of a-tubuUn in azuki bean epicotyls [48],... 

There are no reports on effects of gibberellins on the plant actomyosin complex, although GA3 was shown, by means of the laser trap CODA, to induce a slight increase in the tension properties of transvacuolar cytoplasmic strands [106]. 

Gibberellin antagonists inhibitors of the effects of gibberellins on plants Their effects can be at least... 

Pitta-Alvarez SI, Giulietti AM (1997) Effects of gibberellin GA7 on kinetics of growth and tropane alkaloid accumulation in hairy roots of Brugmansia Candida. Vitro Cell Dev Biol Plant 3 3 (2) 147-15 3... 

There are few specific studies of the effects of gibberellins, ethylene, abscisic acid, and other growth regulators on the cell cycle. While these substances have effects on division in some instances, evidence connecting these effects to specific steps of the cell cycle is generally lacking. 

In Plant growth substances 1973. Hirokawa, Tokyo, pp 917-924 Bentley-Mowat JA, Reid SM (1967) Effect of gibberellins, kinetin and other factors on the growth of unicellular marine algae in culture. Bot Mar 12 185-199 Bentley-Mowat JA, Reid SM (1968) Investigation of the radish leaf bioassay for kinetins, and demonstration of kinetin-like substances in algae. Ann Bot 32 23-32 Bergmann L (1965) The effect of kinetin on the metabolism of plant tissue cultures. 

Cleland R, Thompson M, Rayle DL, Purves WK (1968) Difference in effects of gibberellins and auxins on wall extensibility of cucumber hypocotyls. Nature 219 510-511 Clowes FAL (1954) The promeristem and the minimal construction centre in grass root apices. New Phytol 53 108-116... 

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