Combining Ability Estimates in Arachis hypogaea L. II. Field Performance of F₁ Hybrids¹

Abstract

Estimates of heterosis and combining ability were made using 15 hybrid combinations grown under field conditions. The hybrids were produced by crossing in diallel six peanut (Arachis hypogaea L.) lines collected from three geographic areas of South America.Of 17 characters, estimates of specific combining ability were significant for 16 and estimates of general combining ability were significant for 8. Specific combining ability was greater for yield and for most fruit characters.Several of the crosses showed considerable heterosis when compared with mid‐parent means. Crosses of Virginia × Valencia type parents gave greater heterosis than other crosses for vegetative plant characters. However crosses of Valencia × Spanish type parents gave greatest heterosis for yield and fruit characters.Comparison of field results with results obtained previously in a controlled environment indicated that the controlled environment may have limited use in predicting field performance of peanut hybrids.

Hybrid performance and heterosis in F1 offspring of triticale (× Triticosecale Wittm.)

“…Mh and Hh were calculated using the following formulas (Özgen, 1989;Budak and Yıldırım, 1996;Beche et al, 2013). Hp (F1ij) where Mh ij is the heterosis of the ijth cross; Hh ij is the heterobeltiosis of the ijth cross; F 1ij is the mean of the ijth The t-test was used to determine whether F 1 hybrid means were statistically significant for Mh and Hh means as follows (Wynne et al, 1970):…”

Gene action and combining ability of yield and its components for late kharif season in okra (Abelmoschus esculentus (L.) Moench)

“…The variances for general combining ability and specific combining ability were tested against their respective error variances derived from ANOVA reduced to mean level. Significance test for GCA and SCA effects were performed using t-test as suggested by Cochran and Cox (1950) and Wynne et al (1970).…”

Manifestatation of Hetetrosis in Bread Wheat under Irrigated and Drought Stress Conditions

“…Estimates of heterosis over the mid parent and better parent were calculated. A "t" test was used to evaluate the difference of F 1 means from the respective mid parent and better parent values, following the method as delineated by Wynne et al (1970).…”