Genetic Analysis Of Main Traits In Waxy Corn

In 2001-2002, the whole p2 diallel design of 5 inbreds was adopted in genetic analysis (heterosis, combing ability, genetic parameters, genetic correlation and path, genetic control) of main traits (plant and yield traits, seed traits, starch yield and RVA traits) in waxy com. Main conclusions included:1. HeterosisOver-HP heterosis was found in kernel and starch yield, ear length, 100-kernel weight, kernel length, and kernel width; over-MP heterosis in plant height, ear-position height, stem diameter, ear-3-leaf area, ear diameter, ear row number, row kernel number, kernel volume and density, and starch Final Viscosity (FV); and over-LP in starch content, starch Peak Viscosity (PV), Breakdown, and Setback. No heterosis was found in kernel height, protein and oil content, starch Trough Viscosity (TV), Peak Time, and Pasting Temperature.2. Combining abilityPS had the highest total ranks of GCA effect in plant and yield traits, P3 and PS simultaneously in kernel traits, and P2 in starch yield and RVA traits. P3 had the highest total ranks of SCA variance in 3 main types of traits. Furthermore, related proposals worthy of attaching importance to were posed on parent-select of main traits in waxy corn.3. Genetic parameterAdditive effect was main factor of genetic variance for plant height, ear-position height, stem diameter, kernel height, oil content, PV and TV, which should be selected in early generations. Both additive and non-additive effects were almost equally important factors of genetic variance for ear row number, row kernel number, kernel yield, kernel volume, protein content, and Peak Time, which should be selected in medial or late generations. Non-additive effect was main factor of geneticvariance for ear-3-leaf area, ear length, ear diameter, 100-kernel weight, starch content, starch yield, FV, breakdown, Setback, and Pasting temperature, which should be selected in late generations.4. Genetic correlation and pathNo negative significant correlation existed between yield and its components, between 100-kernel weight and its components, and among their respective components. Negative significant correlation was found between starch content and protein content. Positive correlation was found among PV, FV and TV, while negative correlation exited between all of them and PeakTime and Pasting Temperature. Positive correlation significant at 0.05 or 0.01 level was found among kernel yield, starch yield, and FV. No significant correlation was found between starch viscosity traits and all of plant and yields traits, kernel traits. Ear row number, row kernel number, and 100-kernel weight were principal traits responsible for both kernel and starch yield, and their importance was row kernel number > 100-kernel weight >ear row number.5. Simple identification of genetic controlThe genetic expression of kernel traits (kernel length, kernel width, kernel height, starch content, protein content, oil content) and starch RVA traits (PV, TV, FV, Breakdown, Setback, Peak Time, Pasting Temperature) were controlled by the maternal plant genotypes, but that of FV was also significantly under the endosperm genotypes control. Cytoplasm effect was tested in all of kernel traits and starch RVA traits..