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Within-line pollinations were used when measuring the seed set of plants from seven early generation inbred lines of Primula vulgaris. One high seed setting plant and one low seed setting one were selected from each line and the seed set was evaluated on the offspring from selfings and within-line pollinations of these plants. Regression of offspring on parents for seed set was studied. The slope...
Low and erratic rainfall constitutes a major constraint to sorghum production, and impedes sorghum improvement in semi-arid tropics. To estimate quantitative-genetic parameters for sorghum under variable stress conditions, three sets of factorial crosses between four by four lines each were grown with parents and a local cultivar in eight macro-environments in semi-arid areas of Kenya. Fourteen traits...
Common bean (Phaseolus vulgaris L.) and tepary bean (P. acutifolius Gray) are grown for their edible seed and production is limited by insufficient soil moisture in many parts of the world. Carbon isotope discrimination (Δ) against 13CO_2 during photosynthesis has been suggested as a useful selection criterion to improve crop productivity in water-limited environments, however, there is a need to...
Three hundred twenty germplasm lines of the major Ethiopian cereal, tef, [ Eragrostis tef (Zucc.) Trotter], were evaluated for 20 morphological, phenological and agronomic characters in two-replicated randomized complete blocks at Debre Zeit and Melkassa Agricultural Research Centers in Ethiopia during the 1995 main season. The objectives were to assess the diversity of the lines, and to estimate...
Soluble solids comprise most of onion bulb dry mass, and dehydrator onion cultivars are developed from breeding populations that have high dry mass content. Realized and narrow-sense heritability estimates were obtained for the soluble solids content (SSC) trait in two open-pollinated dehydrator onion breeding populations (BP) using response to selection and half-sib family analysis. Parental populations,...
Three populations of Dimorphotheca pluvialis (L.) Moench were subjected to mass selection for increased oil content. After three cycles of selection, at a selection intensity of 10%, in all three populations a significant increase in oil content was observed. The average gain in oil content per selection cycle varied from 0.5% to 1.2%. Realised heritabilities ranged from 0.15 to 0.58. It is likely...
Semidwarf wheats have the potential to produce high yields when sown and managed under optimal conditions. However, farm yields often fall below this potential because of poor seedling establishment and low early vigour associated with gibberellic acid (GA)-insensitive reducing-height ( Rht) genes contained in these wheats. Australian and overseas wheats containing major and minor Rht genes sensitive...
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...
In the development of new crops such as Dimorphoteca pluvialis (L.) Moench, improvement of flowering synchronisation is an important breeding objective. The flowering of single plants of Dimorphotheca pluvialis could be described by a logistic curve obtained by the regression of cumulative number of open flowers on time. The curve is characterised by three parameters, corresponding with the total...
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