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The objective of this study was to determine general combining ability (GCA), specific combining ability (SCA), gene action and heritability of weevil (Cylass spp.) resistance, dry matter content (DMC), yield and yield-related components of newly developed sweetpotato clones. Six weevil resistant and six susceptible parents were crossed using a 6 × 6 factorial mating design. The resultant 36 families...
In breeding a clonal crop such as tea, selection is a two-stage process. In the first stage the highest yielding individual seedlings are chosen; these are then propagated and planted in clone trials in the second stage. A high selection intensity at the first stage risks eliminating most of the superior genotypes. The optimal proportion to be selected depends on the correlation between seedling ortet...
Salinity is one of the most important constraints in sugar beet production in Asia. An understanding the genetic basis of sugar beet (Beta vulgaris) performance under salinity stress is crucial to gaining insight into salinity tolerance trajectories as well as to designing appropriate breeding strategies in saline stress conditions. In this study, a mating design (North Carolina Design II) was used...
Thirty-four full-sib Pinus koraiensis families were used to evaluate and identify elite P. koraiensis material. Tree height (H) and diameter at breast height (dbh) were assessed. The results from variance analyses showed that familial variance sources for different traits in different growth years were extremely significantly different. The average phenotypic variation coefficients of H, dhb and volume...
The need for sustainable intensification of agriculture in the coming decades requires a reduction in nitrogen (N) fertilization. One opportunity to reduce N application rates without major losses in yield is breeding for nutrient efficient crops. A key parameter that influences nutrient uptake efficiency is the root system architecture (RSA). To explore the impact of N availability on RSA and to...
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