Today the concept of heterotic groups and patterns is fundamental to hybrid breeding theory and practice. Our objectives were to (i) review various hypotheses on the causes of heterosis in maize and on the experimental evidence supporting or refuting them, (ii) examine advantages and disadvantages of the concept of heterotic groups and patterns, (iii) describe the status of heterotic patterns i...

Heterosis refers to the phenomenon in which an F1 hybrid exhibits enhanced growth or agronomic performance. However, previous theoretical studies on heterosis have been based on bi-parental segregating populations instead of F1 hybrids. To understand the genetic basis of heterosis, here we used a subset of F1 hybrids, named a partial North Carolina II design, to perform association mapping for ...

Fifty-two alfalfa (Medicago sativa L.) clones, randomly selected from the cultivar Baker and the experimental line MNGRN-4, were evaluated for resistance (based on nematode reproduction) to Pratylenchus penetrans in growth chamber tests (25 C). Twenty-five clones, representing the range of nematodes and eggs per plant, were selected and retested. Four moderately resistant and two susceptible al...

Line × tester design was employed to evaluate nine parents of Corchorus olitorius for their combining ability and heterosis seedling traits under normal drought conditions. Analysis variance revealed significant differences among the crosses. Under conditions, root length, fresh dry weight roots, volume, shoot exhibited contributions line interaction hybrid. Among parents, JRO 3690 OIN 970 disp...

Abstract Oilseed rape ( Brassica napus L.) is sensitive to heat stress during the reproductive stage, but it not clear whether male and female organs differ in their sensitivity stress. In this study, full diallel crossing experiments were conducted among four genotypes of B. under control, moderate high conditions for five days immediately before two after crossing. General combining ability (...

A study was performed using 6 × 6 F1 diallel population without reciprocals to assess the mode of inheritance of pod yield and related traits in groundnut with imposed salinity stress. Heterosis was found for pod number and yield. Data on general and specific combining ability (gca and sca) indicated additive and nonadditive gene actions. The gca: sca ratios were much less than unity suggesting...