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Association of Color, Yield, and Quality of Lint in Pima Cotton¹

In 1965 and 1966, an evaluation of 30 lines comprising experimental ‘Pima’ cotton (Gossypium barbadense L.) strain P17 showed whitish fiber to be associated with higher yield, longer fiber, coarser fiber, stronger yarn, and possibly stronger and less elastic fiber.

Yield was not correlated with percent lint or its components (seed index and lint index), but it was highly significantly positively correlated with fiber length for 1 of 2 years. Percent lint was negatively correlated with fiber length for both years. Since the yield and percent lint relationship was independent, the negative association of percent lint and fiber length was no barrier in obtaining a combination of high yield and high quality.

The lint of the higher-yielding, higher-quality lines is whiter than that of present commercial varieties. Color appears to have no bearing on the utility of lint.

Key Words: lint color correlations • cotton improvement • Gossypium barbadense L.

² Research Agronomist and Research Geneticist, Crops Research Division, ARS, USDA, University of Arizona Cotton Research Center, Phoenix, Ariz. 85040.

Received for publication August 31, 1967.