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Asian Journal of Plant Sciences
Year: 2008  |  Volume: 7  |  Issue: 7  |  Page No.: 666 - 671

Analysis of Seed Size Effect on Seedling Characteristics of Different Types of Wheat (Triticum aestivum L.) Cultivars

H.R. Tavakoli Kakhki, M. Kazemi and H. Tavakoli    

Abstract: In order to study the effect of seed size on seed vigor index of wheat, a factorial experiment based on a completely randomized design was arranged with four replications at the laboratory. The experiment had two factors. The first factor consisted of 13 wheat genotypes and the second factor included seed size at four levels (1.5, 2, 2.5 and 3 mm in diameter). According to the results, germination percentage, germination rate, root and shoot length, shoot/root length ratio were affected by seed size and genotypes (p<=0.01). Also it revealed, that there were significant correlation (R = 0.85; p<=0.01) between seedling growth rates and seed size treatments. Stepwise regression method was indicated that, seed size was the first (x1) and shoot length was the second (x2) independent variable that could be used to describe the trend of variation in seedling growth rate as dependent variable (Y) (R2 = 0.85). It was observed that by increasing seed size and shoot length, seedling growth rate was increased. As a result, it was concluded that seed size and shoot length are two factors that strongly affect seedling growth rate and could be used to evaluate and assess wheat genotypes and its improvement programs.

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