Abstract
A broad range of cotton (Gossypium hirsutum L.) germplasm resources exist with characteristics useful for improving modern cotton cultivars. However, much of this germplasm is not well utilized. The objective of this study was to evaluate agronomic and fiber traits of four germplasm populations to determine the effectiveness of pooling germplasm for generating variability to improve traits of interest. Four populations were developed with parents chosen based on (1) dwarfing genes, (2) a combination of fiber strength and length traits, (3) glandless genes, or (4) inclusion in the G. hirsutum center-of-origin, i.e. race, germplasm group. The dwarf germplasm population had smaller bolls, a smaller lint index, a smaller seed index, lower micronaire, and shorter fibers than the other three populations. There were no significant differences in lint yield, elongation, or strength among the germplasm populations. In contrast to the general lack of significant differences among populations for agronomic and fiber traits, within population variation was observed to be high. Therefore, selections could be made within the race population to raise lint yields and within the fiber population to increase fiber length. Likewise, selections within the glandless population could be made for boll size, lint index, seed index, micronaire, and strength. These results suggest that intercrossing multiple parents in complex populations generates a large amount of variability with potential uses in crop improvement.
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Acknowledgments
The authors gratefully acknowledge S. Wang, J. Harris, B. Cervantez, and K. Hoegenauer for their invaluable technical assistance. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the US Department of Agriculture.
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Hinze, L.L., Kohel, R.J., Todd Campbell, B. et al. Variability in four diverse cotton (Gossypium hirsutum L.) germplasm populations. Genet Resour Crop Evol 58, 561–570 (2011). https://doi.org/10.1007/s10722-010-9599-8
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DOI: https://doi.org/10.1007/s10722-010-9599-8