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Potato plays important roles in Ethiopia's economy through ensuring food security as well as source of income for potato farming community. In addition to breaking tubers' dormancy and enhancing sprouting, plant growth regulators (PGRs) are known to affect tubers' quality components of potatoes which are usually governed by genotypes and some other abiotic factors. However, whether PGRs affect tubers' quality components of Ethiopia's potato varieties has not been known and documented in the past. Hence, the present study was conducted to evaluate the effect of pre-treatment of seed tubers with different plant growth regulators on some tubers' quality components of two common potato varieties in Ethiopia. The study evaluated the effect of three PGRs viz. Gibberrelic Acid (GA3), Benzyladenine (BA) and Benzylamino purine (BAP) at two concentrations (0.1mM and 0.2mM) and distilled water-DW as untreated control on some tubers' quality components of variety Belete and Jalenie at Kulumsa Agricultural Research Center, Southeast Ethiopia in 2018. Forty sprouted tubers from each treatment combination (two varieties and three PGRs at two concentrations with untreated controlDW) were planted per plot (9m) in a factorial experiment using Randomized Complete Block Design (RCBD) and replicated three times. The required agronomic practices such as cultivation (weeding), ridging, fertilization, pesticide application, etc. were applied uniformly to all experimental units as needed. The results showed that both varieties were different in their responses to the PGRs used, while BA and BAP showed a significant effect on most of the tuber quality components compared to GA3 at the lowest concentration (0.1mM) although no significant difference was obtained between BA and BAP. However, the two varieties Belete and Jalenie were found to be different in the tubers' qualities measured and between plant growth regulators. Belete was better than Jalenie in terms of tubers' specific gravity, dry matter and starch content and total soluble solids regardless of the effect of the PGRs. Hence, either BA or BAP or both could be used as pre-treatment plant growth regulators to improve the quality components of potato tubers of the two varieties.

Quality Components of Potato Tubers as Affected by Plant Growth Regulators