《Table 1–Plant height, internode length, spike length, coleoptile length and seedling shoot length o

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《"Mapping of dwarfing gene Rht14 in durum wheat and its effect on seedling vigor, internode length and plant height"》

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The HI 8498/Castelporziano population segregating at the RHT14 and RHT-B1 loci was examined to compare effects of the semidwarfing alleles on plant height，internode length，spike length，coleoptile length and seedling shoot length.Regression analysis showed that the reductions in plant height due to Rht14（R2=0.29；P<0.001）and Rht-B1b（R2=0.37；P<0.001）were significant and that the magnitudes of reduction were similar at about 25%（Table 3）.All internode lengths were significantly reduced by both alleles（P<0.001）.However，the patterns of variation were different；the phenotypic variation explained by Rht14 was higher for upper internodes compared to lower internodes，and the reverse was true for Rht-B1b.The results showed that reduction due to Rht14 was 28.1%at internode-1 and 21.9%at internode 4，whereas the comparative values for Rht-B1b were 21.8%at internode 1 and 34.3%at internode 4（Table 4）.RILs carrying Rht-B1b showed a significantly shorter Internode-4 than RILs carrying Rht14.Coleoptile length and seedling shoot length were significantly reduced by Rht-B1b（P<0.001），whereas Rht14 did not affect either trait.RILs carrying both the genes also showed significant reduction in coleoptile length and seedling shoot length，however this effect was mainly attributed to Rht-B1b.Distributions of plant height，coleoptile length，seedling shoot length，spike length and internode length for Tall，Rht14，Rht-B1b，and Rht14+Rht-B1b genotypes are depicted as box-and-whisker plots in Fig.3.