• Murali-Tottekkaad Variath

      Articles written in Journal of Genetics

    • Analysis of embryo, cytoplasmic and maternal genetic correlations for seven essential amino acids in rapeseed meal (Brassica napus L.)

      Guo Lin Chen Jian Guo Wu Murali-Tottekkaad Variath Zhong Wei Yang Chun Hai Shi

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      Genetic correlations of nutrient quality traits including lysine, methionine, leucine, isoleucine, phenylalanine, valine and threonine contents in rapeseed meal were analysed by the genetic model for quantitative traits of diploid plants using a diallel design with nine parents of Brassica napus L. These results indicated that the genetic correlations of embryo, cytoplasm and/or maternal plant havemade different contribution to total genetic correlations of most pairwise nutrient quality traits. The genetic correlations among the amino acids in rapeseed meal were simultaneously controlled by genetic main correlations and genotype × environment (GE) interaction correlations, especially for the maternal dominance correlations. Most components of genetic main correlations and GE interaction correlations for the pairwise traits studied were significantly positive. Some of the pairwise traits had negative genetic correlations, especially between valine and other amino acid contents. Indirect selection for improving the quality traits of rapeseed meal could be expected in rape breeding according to the magnitude and direction of genetic correlation components.

    • Timing of gene expression from different genetic systems in shaping leucine and isoleucine contents of rapeseed (Brassica napus L.) meal

      Guo Lin Chen Jian Guo Wu Murali-Tottekkaad Variath Chun Hai Shi

      More Details Abstract Fulltext PDF

      Experiments were conducted on rapeseed (Brassica napus L.) using a diallel design with nine parents: Youcai 601, Double 20-4, Huashuang 3, Gaoyou 605, Zhongyou 821, Eyouchangjia, Zhong R-888, Tower and Zheshuang 72. The seed developmental process was divided into five stages, namely initial (days 1–15 after flowering), early (days 16–22 after flowering), middle (days 23–29), late (days 30–36), and maturing (days 37–43) developmental stages. The variation of dynamic genetic effects for leucine and isoleucine contents of rapeseed meal was analysed at five developmental stages, across different environments using the genetic models with time-dependent measures. The results from unconditional and conditional analyses indicated that the expression of diploid embryo, cytoplasmic and diploid maternal plant genes were important for leucine and isoleucine contents at different developmental stages of rapeseed, particularly at the initial and early developmental stages. Among different genetic systems, nutrition quality traits were mainly controlled by the accumulative or net maternal main effects and their GE interaction effects, except at maturity when the net diploid embryo effects were larger. The expression of genes was affected by the environmental conditions on 15, 22, 29 or 36 days after flowering, but was more stable at mature stage. For the isoleucine content the narrow-sense heritabilities on 15, 22, 29, 36, and 43 days after flowering were 43.0, 65.7, 60.1, 65.5 and 78.2%, respectively, while for the leucine content the corresponding narrow-sense heritabilities were relatively smaller. The interaction heritabilities were more important than the general heritabilities at the first three developmental times. The improvement for isoleucine content could be achieved by selection based on the higher narrow-sense heritabilities. Various genetic systems exhibited genetic correlations among the developmental times or leucine and isoleucine contents. A simultaneous improvement of leucine and isoleucine contents seems possible because of the significant positive genetic correlation components from different genetic systems at different developmental times.

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