Stability in Yield and Fiber Quality of California Cotton1
- Shu Geng,
- Qifa Zhang and
- D. M. Bassett2
Stable performances in crop yield and quality traits over a wide range of growing conditions are desiralbe from a standpoint of management and marketing. In this paper, we have studied the stability of yield and quality of 43 cotton (Gossypium hirsutum L.) cultivars tested in California cotton breeding programs over 18 yr (1966–1983). There is a positive correlation between mean yield and the stability coefficient for yield. This association suggests that cotton cultivars producing higher yields are, in general, lower in stability. Exceptions, however, are observed in a few cultivars, suggesting that selection for specific adaptation does not automatically lead to reduction in general adaptability. Quality scores are less responsive to environmental changes than yields. Still, a negative correlation between mean quality scores and stability coefficients of fiber qualities is observed. Thus, changes brought about by plant breeding have resulted in progressive changes in the direction of higher quality and greater stability of quality. Our analysis shows that plant breeding in the last 18 yr has simultaneously improved yield and quality in California cotton, and that future selections for new cultivars with emphasis on quality may result in greater economic returns.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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