Paclobutrazol Applied on Cotyledonal Leaves and Quality of Cucumber, Squash, Melon and Watermelon Seedlings

Abstract

The research was done to determine the effects of paclobutrazol (PBZ) through the dose of 150 mg•L −1 , on the quality of seedlings determined by the content of chlorophyll, height, leaf area, dry matter of roots and of the aerial part of cucumber, squash, melon and watermelon. Sowing of all species carried out on October 21, 2013 in polystyrene trays with 200 cavities filled with peat moss. Treatments were the doses of 150 mg of PBZ•L −1 water and the control (distilled water). The solution with PBZ and the distilled water were applied only once with manual atomizer on cotyledonal leaves by mean of 25 shots made approximately with the same force, having put physical barriers between experimental units. In the four species (cucumber, squash, melon and watermelon) the PBZ increased the chlorophyll content in 26.0%, 14.9%, 19.4% and 26.5%, respectively, compared to the control; height decreased in 24.0%, 34.7%, 16.3% and 23.4%; leaf area decreased in 40.1, 0.5, 30.4 and 16.2%; the dry matter of roots increased in 20.0%, 62.5%, 85.7% and 19.7%; whereas in cucumber the dry matter of the aerial part increased 12.3%, in squash decreased 5.3%, and in melon and watermelon increased in the respective 22.9 and 3.3%, so that the 150 mg dose of PBZ can be used to produce seedlings with higher quality for transplant.

New Approach in Obtaining the Ideal Watermelon (Citrullus lanatus) Seedling: Tebuconazole

“…As a result of the measurements on the leaves of the seedlings, it was determined that in the chlorophyll content increased in the seedlings in the application group compared to the control group. In similar studies, it was found that paclobutrazol applied with foliar spray on melon seedlings increased the chlorophyll content in the leaves (Flores et al, 2018); besides, similar results were obtained from several species such as watermelon (Baninasab, 2009), Potato (Tsegaw et al, 2005) and lettuce (Akdemir, 2018). It was found that almost all of the different doses of Tebuconazole in melon seedling cultivation prevented excessive and unnecessary growth in seedling and stem lengths.…”

“…In a study conducted on eggplant, the tebuconazole applied at different doses significantly decreased the seedling length and stem length (Öztürk and Dursun, 2020). In a study on seedling quality of melon, 25 ppm paclobutrazol application was determined to suppress seedling length (Flores et al, 2018). In another study, the characteristics of tomato seedlings were investigated by applying paclobutrazol from the soil (1 ppm) and through foliar spray (25 ppm) at the stage where 2-4 true leaves were formed in tomato seedlings.…”

“…In a similar study, the control applications showed decreases at 7% and 6% in dry weights of tomato seedlings (Berova and Zlatev, 2000). In zucchini seedlings, 25 ppm paclobutrazol application was found to decrease the dry matter content in the aboveground parts of the seedlings and increase the root dry matter content (Flores et al, 2018). The changes in the plant dry matter content are considered to affect the synthesis and transport of gibberellic acid by Tebuconazole and can be caused by the regression in the growth.…”

Morphology of yellow passion fruit seedlings submitted to triazole induced growth inhibition

“…O Paclobutrazol (PBZ) the chemical name [(2RS, 3RS) -1 -(4-clorofenil) -4, 4-dimetil-2-(1, 2, 4-triazol-1-il) -pentano-3-ol] is one of the most effective triazole that inhibits gibberellin biosynthesis (Baninasab;Ghobadi, 2011). It is used to enhance seedling quality of tomato (Seleguini et al, 2013) and cucurbits (Flores et al, 2018).…”

Effect of Paclobutrazol on Growth and Delaying Bolting of Lettuce (Lactuca sativa L.) cv. Balady

“…The higher concentrations of PBZ caused a greater reduction than corresponding low concentrations. The inhibitory effect of PBZ on plant height has been reported in various crops such as tomato [28]; cucumber [26,27,42] squash, melon and watermelon [42]. Meanwhile, the foliar spray with 50 mg.L [28]; cucumber, melon and watermelon [42], olives [43], apple seedlings [24] and grapevines [44].…”