Cotton chromosome substitution lines crossed with cultivars: genetic model evaluation and seed trait analyses |
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Authors: | Jixiang Wu Jack C McCarty Johnie N Jenkins |
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Institution: | (1) Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762, USA;(2) USDA-ARS, Crop Science Research Laboratory, P.O. Box 5367, Mississippi State, MS 39762, USA;(3) Present address: Plant Science Department, South Dakota State University, Brookings, SD 57007, USA; |
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Abstract: | Seed from upland cotton, Gossypium hirsutum L., provides a desirable and important nutrition profile. In this study, several seed traits (protein content, oil content,
seed hull fiber content, seed index, seed volume, embryo percentage) for F3 hybrids of 13 cotton chromosome substitution lines crossed with five elite cultivars over four environments were evaluated.
Oil and protein were expressed both as percentage of total seed weight and as an index which is the grams of product/100 seeds.
An additive and dominance (AD) genetic model with cytoplasmic effects was designed, assessed by simulations, and employed
to analyze these seed traits. Simulated results showed that this model was sufficient for analyzing the data structure with
F3 and parents in multiple environments without replications. Significant cytoplasmic effects were detected for seed oil content,
oil index, seed index, seed volume, and seed embryo percentage. Additive effects were significant for protein content, fiber
content, protein index, oil index, fiber index, seed index, seed volume, and embryo percentage. Dominance effects were significant
for oil content, oil index, seed index, and seed volume. Cytoplasmic and additive effects for parents and dominance effects
in homozygous and heterozygous forms were predicted. Favorable genetic effects were predicted in this study and the results
provided evidence that these seed traits can be genetically improved. In addition, chromosome associations with AD effects
were detected and discussed in this study. |
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