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This article in CS

  1. Vol. 8 No. 1, p. 111-113
    Received: July 10, 1967

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Heterosis and F2 Performance in Intraspecific Crosses Among Varieties of Gossypium hirsutum L. and of G. barbadense L.1

  1. A. Marani2



Three trials, conducted in 1964 and 1965 in Israel, included a set of four varieties of G. hirsutum L. and their intraspecific crosses in all combinations in the F1 and F2 generations, and a similar set of four G. barbadense L. varieties and their F1 and F2 intraspecific crosses. Heterosis for lint yield was 15 to 24% and 21 to 28% in G. hirsutum L. and G. barbadense L. intraspecific F1 crosses, respectively. This was always associated with heterosis for yield of seed-cotton and for the number of bolls produced. Heterosis for boll-weight was found in G. hirsutum L., but was not always shown by G. barbadense L. Heterosis for boll number was associated with a higher percentage of boll retention in G. hirsutum L. and with more flower production in G. barbadense L.

F2 deviations from the average of mid-parent and F1 performances were relatively small for lint yield, indicating that although some epistatic effects may be operative for this trait, additive and dominance genetic effects are more important. In G. hirsutum L. significant F2 deviations were found for lint-index and lint-percent, and in some cases also for seed-index. In G. barbadense L. a significant F2 deviation was found only for flower number in one experiment.

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