Effects Of Gibberellic Acid Treatment Research Articles

Effects of Pre-Treatment of Gibberellic Acid Solution on Musa sikkimensis Seeds

Musa sikkimensis Kurz (Musaceae) is one of the most popular banana species in the western world. It is near-hardy, surviving temperatures down to 0°C, but its propagation and cultivation are little researched. This study investigates the effects of gibberellic acid treatment on germination of Musa sikkimensis seeds. Enhanced germination rates will offer nurseries, botanic gardens and amenity growers the opportunity to increase their cultivation success. The findings are compared with those of other Musa species.

Effects of gibberellic acid treatments on fruit thinning and fruit quality in Japanese plum (Prunus salicina Lindl.)

The crop load of Japanese plums must be adjusted to ensure that the size of the harvested produce agrees with market requirements. The present study investigated the effects of gibberellic acid (GA3) treatment at different concentrations and during different cultivation periods after full bloom on the next year's fruit thinning and the current year's fruit quality. GA3 was applied to plum trees at concentrations of 50 and 75mg/L at 12 and 14 weeks after anthesis (WAA). GA3 treatment at a concentration of 75mg/L 14 WAA decreased harvest yield by 27.93%, whereas yields were similar to that of the control treatment under the remaining experimental conditions. The main impact was on fruit size: trees treated with GA3 14 WAA had significantly larger fruit than did trees under the other treatments. In consideration of the reduction to total yield, 50mg/L is recommended for thinning purposes in Japanese plum. Fruit color, total soluble content concentration, and fruit firmness were increased after GA3 application. The antioxidant activity of the untreated trees was higher than that of the GA3 treated trees, whereas phenol content was determined to be similar.

Effects of gibberellic acid treatment and light conditions on germination of true potato seed

The effects of gibberellic acid treatment and light conditions on the germination of true potato seed were investigated. The treatments included pre-soaking with different concentrations of GA3 for 24 h and the addition of different concentrations of GA3 to the MS medium. Different light conditions were also examined. One set of each treatment was placed in 16 hours of light and 8 hours of dark. The other set was placed in 24 h of dark for a week and then placed in the same condition as that of the first set. The percentage of seed germination scored two weeks after sowing was analyzed using the three-way analysis of variance. No interaction between two or three factors was observed, but all three factors were individually significant at a 99% confidence level. Consequently, individual analysis of the three factors revealed that 1) the effect of pre-soaking with 4,500 ppm of GA3 was the best, but not significantly different from that of 500 and 1,500 ppm; 2) the effect of 0.5 ppm of GA3 in the medium was the best, but not significantly different from that of 1 ppm; and 3) the effect of dark condition for one week after sowing was highly significant.

The sunflower dwarf mutant dw1: Effects of gibberellic acid treatment

A severe dwarf mutant affecting vegetative and reproductive growth arose spontaneously in our sunflower-breeding nursery in 1999. The segregation data did not deviate significantly from the expected ratio for a recessive monogenic character. Periodic treatment with gibberellic acid (GA3) was effective to revert to the wild type phenotype and internode elongation was directly related to the GA3 concentration. The results suggest that the mutant gene is involved in the enzymatic pathway of GA synthesis.

Effects of Gibberellic Acid Treatments on Fruit and Seed Development of Muscadine Grapes

Gibberellic acid, a plant growth regulator commonly sprayed for seedless bunch grape cultivars, was used to spray on the seeded muscadine grape cultivars `Carlos', `Fry', `Higgins' and `Triumph'. GA3 at 100 to 300 ppm were sprayed on leaves and fruit clusters before and after anthesis. The flower/fruit clusters also were dipped into a much higher concentration (1000 ppm) in addition to the sprayed concentration of GA3. Berry weight significantly increased in all the sprayed vines, with a maximal increase up to 50%. Early and more uniform ripening was observed in the cultivar `Triumph'. More than 20% of seedless berries also were found on the GA3-sprayed `Triumph' vines. However, the latter two responses (early ripening and seedlessness) did not occur in other cultivars tested. Similar results also were obtained in the dipping treatments. The results indicated that the seeded muscadine grapes responded well to the GA3 treatments in general, but genotype variation is obvious.

Effects of Gibberellic Acid Treatment on Safflower1

SynopsisFoliar applications of gibberellic acid on field plantings of safflower depressed seed yields and oil content of the seed. They induced earliness, internode elongation, and sterility, accompanied by chlorosis and susceptibility to Phytophthora root rot. Seed weight and iodine number of the oil were not affected.