A doctoral dissertation in the College of Agriculture on the study of molecular variation among certain local apple cultivars and their response to foliar application of paclobutrazol and tryptophan.
The College of Agriculture at the University of Diyala convened the defense of a doctoral dissertation entitled “A Study of Molecular Variation among Certain Local Apple Cultivars and Their Response to Foliar Application of Paclobutrazol and Tryptophan.”
The dissertation, submitted by Mr. Uday Mohammed Abdullah, aimed to determine the extent of genetic variation at the molecular level among three local apple cultivars and to establish their genetic fingerprinting profiles.
The study reached several conclusions, most notably:
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The Sharabi and Ibrahimi cultivars demonstrated superiority over the White cultivar in numerous vegetative growth characteristics. This distinction is attributed to the closer genetic relationship between Sharabi and Ibrahimi compared with the White cultivar (Experiment One).
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Foliar application of paclobutrazol at a concentration of 500 mg L⁻¹ exerted a positive effect in enhancing leaf carbohydrate content and improving most quantitative and chemical yield traits. It also contributed to reducing the incidence of fruit worm infestation.
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The majority of the two-way and three-way interaction effects did not produce a significant influence on the vegetative, fruit, or chemical characteristics of the fruits.
The study recommends the use of paclobutrazol at concentrations higher than those employed in the present experiment. It further advises examining the application of paclobutrazol on other fruit trees, given its role in regulating vegetative growth—particularly in high-density cultivation systems—thereby enabling an increase in the number of trees per unit area.
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