Commonality analysis and selection of parents for within-boll yield components in upland cotton
Abstract
Relationships between lint yield and within-boll yield components are important for genetic improvement of lint yield in cotton (Gossypium hirsutum L.) cultivars. F2 plants derived from crosses between germplasm lines and high yielding cultivars were analyzed to determine the contributions of within-boll yield components to lint yield and to select parents with desirable combining ability for multiple within-boll yield components. Forty-five F2 hybrids were planted at two field sites in 2010 and 2011 with 4 and 3 replicates, respectively. There were a total of six yield components analyzed including lint percentage (LP), seed number per boll, lint weight per seed (LW_S), seed surface area per seed, lint weight per unit seed surface area (LW_SA), and lint number per unit seed surface area (LN_SA). The contributions of these yield components to lint yield were analyzed by commonality analysis that separated the contributions to lint yield into the unique contributions of single yield components and the common contributions of the single yield components with one or more other yield components. The unique contributions of the six yield components to lint yield ranged from 1.6 to 21 % of total variation for lint yield in the 2-year experiments. The greatest common contributions to lint yield among all combinations of the six yield components were identified for a combination of four components, LP, LW_S, LW_SA, and LN_SA with 67 and 44 % of the total variation of lint yield in 2010 and 2011, respectively. Results suggest that all four of these yield components should be considered simultaneously in breeding for genetic improvement of lint yield. The germplasm line SP225 was detected as a good combiner with positive general combining ability (GCA) for LP (1.4 %), LW_SA (0.03 mg mm−2), and LN_SA (14.3 no mm−2), and favorable GCA for fineness (−3.1 mg km−1).
Keywords
Within-boll yield components Commonality analysis General combining ability Cotton YieldAbbreviations
- GCA
General combining ability
- JC
John cotton germplasm
- LP
Lint percentage
- LW_S
Lint weight per seed
- LY
Lint yield
- LW_SA
Lint weight per unit seed surface area
- LN_SA
Lint number per unit seed surface area
- SA_S
Seed surface area per seed
- SN_B
Seed number per boll
- SP
Species polycross germplasm
- SW
Seed weight
Notes
Acknowledgments
This research was funded by USDA-ARS, Project No. 6402-21000-051-00D. USDA is an equal opportunity provider and employer. USDA is an equal opportunity provider and employer.
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