Assocation of carpel and seed number with other boll parameters in contrasting cotton genotypes
1999
Bedada Girma(Kulumsa Research Center, Kulumsa (Ethiopia)) | F.M. Bourland(University of Arkansas, Fayetteville (USA))
Carpel number in cotton (Gossypium hirsutum L.) is an important character that influences boll weight, seed number, and lint weight. The objective of this study was to investigate relationships of carpel and seed and lint characteristics. Nine genotypes classified into three groups (Covered, Partial and Naked) based on their seed fuzz characters were tested under field conditions. The plots were managed under research farms recommended practices. At maturity, first position bolls were harvested with their burs, and number of carpels, boll weight, seed number, seed and lint weight per boll, and lint fraction were determined. Genotypic groups differed in the expression of the carpel character. The partial group produced high proportion of 5-lock bolls. While the Covered and Naked groups produced more 4-lock bolls. In all groups, 5-lock bolls had higher boll, seed and lint weights per boll, and more seed than 4-lock bolls. Increase in seed number was associated with increased seed and lint weight per boll, and with decreased seed index, but did not affect lint fraction. The partial group showed a positive influence of carpel and seed number on lint fraction, seed index and lint index, but these effects were mostly negative in the Covered and Naked groups. The partial group offers a good germplasm source for development cultivars with high carpel number and reduced seed-coat fuzz.
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