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棉 花 学 报 Cotton Science 2008，20(2)：83-87
Research for Cytoplasm Effects of New Type CMS-D8 on Cotton Abstract：For investigating the cytoplasmic effects of the new type CMS-D8 on yield characters and fiber qualities, three types of crosses were designed by A × R,B × R,R × B, and three male-sterile lines(A line),three corresponding maintainer lines(B line) and three restorer line(R line). A lines and R lines were the fifth generations of backcross successively by domestic materials, and the R lines were crossed to the second generations after backcross. The field planting followed by NC Ⅱ design with two rows and three replications. The field management and pest management followed essentially the practice under the normal agricultural conditions. The examination of field characters included weight and number of boll, lint percentage, seed yield, and lint yield. The fiber qualities were mainly checked on fiber length, strength, uniformity, elongation, and micronaire.The results showed that the greatly significant negative effects were observed on seed yield and lint yield for sterile cytoplasm of D8, the average seed-lint yield declined by 15.3%～25.6%，lint yield declined 25.0%～39%；But CMS-D8 had different effects to different yield components, the average decline of bolls weight came to 0.89～1.00 g, the average decline of lint percentage wene 4.59～7.08, but had no significantly on number of boll. The fiber length and fiber uniformity were not influenced by sterile cytoplasm of D8, and the fiber strength was improved by 1.0～1.1cN·tex-1, micronaire was reduced to 1.4～1.5, fiber elongation was enhanced to 0.4. Different genotypes were influenced differently by sterile cytoplasm of D8.
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