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Analysis of genetic main effects and GE interaction effects for protein content (PC) and protein index (PI) of indica rice (Oryza sativa L.) was conducted for two year experimental data by using a genetic model for quantitative traits of seeds in cereal crops. Nine cytoplasmic male sterile lines or maintainers as female parents and five restorer lines as male parents were used for a NC II mating design...
The origin of cassava has long eluded researchers. The botanical origin, the geographical origin, the area of domestication, all are disputed matters. The argument advanced here is that, once the wild ancestor is identified, speculation about the taxonomy and the geographical cradle of the root crop will narrow considerably, as a number of species and geographical areas will automatically become excluded...
The microprojectile bombardment procedure has allowed the stable transformation of indica and japonica rice varieties, although at different frequencies of transformation depending mainly on their regeneration capacity and on the specific parameters of the transformation protocol. A study of the process of regeneration to whole plants from primary calli derived from mature indica and japonica rice...
Selection of superior crosses of groundnut (Arachis hypogaea L.) in early generations would increase the probability of identifying superior lines. The objective of this study was to determine the potential of selecting for physiological traits identified in a yield model [crop growth rate (C), reproductive duration (DR) and partitioning (p)] in segregating populations. Forty populations and nine...
Twenty-two sorghum genotypes were evaluated for grain mould response, 13 morphological and biochemical traits thought to contribute to resistance, and 3 agronomic traits related to utilization. Measurements of grain mould (field grade score, threshed grade score, ergosterol content, and percentage germination) were strongly correlated with one another. Highly significant correlations between measures...
Wide hybridization that cannot be attained through conventional sexual crosses, can now be approached by somatic hybridization. Protoplasts of I. ensata and I. germanica were fused by electrofusion. For the selection of somatic hybrids, protoplasts of I. ensata which did not form colonies in protoplast culture and protoplasts of I. germanica which had regeneration ability for only albino shoot were...
To investigate the genetic regulation of postharvest flower longevity in Asiatic hybrid lilies (Lilium L.), 10 cultivars and 45 progenies were forced, harvested and evaluated under standardised conditions in growth chambers. Analysis of variance for individual flower longevity indicated highly significant (p < 0.001) variation among parents, among progenies and among descendants within progenies...
The Russian wheat aphid Diuraphis noxia (Kurdjumov) is a serious pest of wheat in South Africa. The use of D. noxia-resistant cultivars may reduce the impact of this pest on wheat production and at the same time reduce environmental risks and control costs. The mechanisms of resistance in two new sources of resistance were compared by using various methods, in order to establish a rapid and relatively...
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