Seed trait evaluation of <Emphasis Type="Italic">Gossypium barbadense</Emphasis> L. chromosomes/arms in a <Emphasis Type="Italic">G. hirsutum</Emphasis> L. background |
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| Authors: | Jixiang Wu Johnie N Jenkins Jack C McCarty Peggy Thaxton |
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| Institution: | (1) Department of Plant and Soil Sciences, Mississippi State University, P.O. Box 9555, Mississippi State, MS 39762, USA;(2) Crop Science Research Laboratory, USDA-ARS, P. O. Box 5367, Mississippi State, MS 39762, USA;(3) Delta Research and Extension Center, Mississippi State University, Stoneville, MS, USA |
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| Abstract: | Investigation of cotton nutritional components is important because its seeds provide a useful nutritional profile and can
possibly serve as a biofuel resource. In this study, five cultivars, 13 cotton chromosome substitution (CS-B) lines, their
donor parent, '3-79', and their recurrent parent, 'TM-1', were evaluated for seed traits over four environments. A mixed linear
model approach with the jackknife method was employed to estimate variance components and to predict genotypic effects for
each seed trait. Genotypic effects were more important than genotype by environment interaction for all seed traits. Chromosome
associations with these seed traits were detected using the comparative method by comparing the differences between each CS-B
line and TM-1. For example, chromosome 4 of 3-79 in TM-1 background was associated with reduced seed index (SI), embryo percentage,
protein percentage while associated with increased seed oil percentage and seed fiber percentage. Other chromosome associations
with these seed traits were also observed in this study. SI was highly correlated with three seed index traits: seed protein
index, seed oil index (OI), and seed fiber index. Lint percentage, boll number, and lint yield were positively correlated
with protein percentage while negatively correlated with SI and OI. SI and seed fiber content exhibited negative correlations
with micronaire but positive correlations with fiber length and strength. Results suggested that agronomic traits and seed
nutrition components can be improved simultaneously. |
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| Keywords: | Chromosome substitution line Cotton Seed traits Chromosome associations |
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