Mature plant growth regulator

Trees of Citrus sinensis Osbeck cv. The treatments were applied 3 times, at intervals of 45 days. None of the treatments promoved alterations in the development of the fruits, but they did reduce the natural fall rate, when compared to control, up to Key words: Auxins, gibberellins, fruit drop, development.

Plant Cell, Tissue and Organ Culture. Plant growth regulators applied in vitro affected strawberry plant performance ex vitro for a period of up to 4 months. Benzyl-adenine and gibberellin enhanced juvenile characteristics; in general, more runners and monofoliolate leaves were produced, net photosynthesis was reduced, leaf diffusive resistance was increased and, on occasion, flowering was delayed. In contrast, abscisic acid and a gibberellin biosynthesis inhibitor, paclobutrazol, resulted in a more adult phenotype; specifically, flowering was earlier, net photosynthesis and leaf diffusive resistance rates were equal to those of adult plants, and fewer leaves were monofoliolate. Tissue culture-produced plants reacquire the adult phenotype earlier than seedlings mature.

Plant hormones also known as phytohormones are signal molecules produced within plants , that occur in extremely low concentrations. Plant hormones control all aspects of growth and development, from embryogenesis , the regulation of organ size, pathogen defense, stress tolerance and through to reproductive development. Unlike in animals in which hormone production is restricted to specialized glands each plant cell is capable of producing hormones.

Plant Growth Regulation. Early foliar spray treatments containing gibberellic acid GA 3 significantly lower the concentration ofthe bitter flavonoid naringin in fruit tissues. Sprayscontaining a surfactant and different levels ofGA 3 5, 50, , and ppm or abscisic acid ABA 5, 25, and 50 ppm were applied to young,developing fruit on mature grapefruit Citrusparadisi trees during the period from April to June,beginning just after fruit set. The fruit were allowedto mature and were harvested early the following year.