Some Reactions of Physiological and Morphological characteristics to foliar Application of Paclobutrazol in Autumn sugar beet (Beta Vulgaris)  

Mehdi Sadeghi-Shoae¹, Dariush Fatholah Taleghani¹ and Davood Habibi²

¹Sugar Beet Seed Institute (SBSI), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran.

²Islamic Azad University, Karaj Branch, Karaj, Iran.

Corresponding Author E-mail: sadeghishoae@sbsi.ir

DOI : http://dx.doi.org/10.13005/bbra/2439

ABSTRACT: Water is the most important limitation factor in Iran agriculture. Replacing autumn beet to spring beet is one solution to save water resources. Bolting control is essential to improve autumn beet in region with moderate winter. This experiment was designed to determine genotypes and different levels of paclobutrazol on bolting of autumn sugar beet in Moghan- Iran. Thus, a split plot test under randomized complete block design with two factor was performed in which the first factor was paclobutrazol with three levels (control, 150 and 300 ppm) and second factor was six genotypes (Eudora, Giada, Jawaher, Levante, Vico and (FC607*474)*Pool-PC.F2-HSF60-P.3). Some traits Contains giberelic acid, percentage of bolting, height of bolted stem, percent of flowering, white sugar yield and root dry matter percentage were analyzed. The overall results showed that was significant differences in genotypes and different levels of paclobutrazol for giberelic acid, percentage of bolting, height of bolted stem, white sugar yield and root dry matter percentage. The least amount of gibberellic acid and percentage of bolting content between on levels of 150 and 300 ppm paclobutrazol, in order for gibberellic acid, with 65.71 and 64.57 nano moles per gram of fresh tissue and for percentage of bolting with 16.97 and 16.86% respectively. The highest white sugar yield was obtained in levels of 150 and 300 ppm of paclobutrazol, respectively with 8.15 and 8.37 tons per hectare. The interaction effects between genotypes and paclobutrazol in traits of giberelic acid and percentage of bolting were significant. The least percentage of bolting obtained in variety Eudora and 300 ppm paclobutrazol consumption about 2 percent.

KEYWORDS: autumn sugar beet; genotype; gibberellic acid; paclobutrazol; percentage of bolting

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