Search Results
Abstract
Phosphorus concentration is an important factor in quality of tomato fruits because of its effect on the relationship between pH and titratable acidity. There was no significant change in P concentration of fruits from 4 to 10 weeks (cannery ripe) after anthesis in cultivar VF 145-7879. The P concentration was relatively high at 2 weeks and decreased during senescence. The inheritance of P concentration was studied with ‘Best of All’, ‘STEP 375’ and their F1, B1, B2, and F2 progeny. The data indicate a significant genotype-environment interaction. Partition of the genetic variance revealed that additive and dominant effects and additive × additive interaction are important in determining P concentration. There is evidence that 2 major genes are involved.
Abstract
Three tomato (Lycopersicon esculentum Mill.) lines with divergent viscosities and their F1, BCP1, BCP2, and F2 progeny were analyzed for serum viscosity, gross viscosity, and five alcohol insoluble solids (AIS) components. The components were water soluble polysaccharides and polygalacturonides, water-insoluble polysaccharides and polygalacturonides, and acid-hydrolyzed polysaccharides. Stepwise regression analysis of data from parents and progeny was used to establish the relationships between a change in composition and a change in viscosity. The polygalacturonides accounted for most of the variation in gross viscosity among the parental lines. The data indicate that water-insoluble, pectinol-solubilized polysaccharides have the potential for making a large contribution to viscosity at higher concn. The water-soluble polysaccharides and complex polysaccharides (solublized in H2SO4) contributed little to gross viscosity. The sugars identified in the AIS were arabinose, ribose, xylose, mannose, galactose, and glucose. Galacturonic acid was the only organic acid detected. Concentration of the compounds varied among the fractions and among the parental lines.
Abstract
Three cultivars of onions used for dehydration were grown in a greenhouse at constant soil (bulb) temperatures of 13°, 18°, 24°, and 29°C. Growth of tops was best at 24° and poorest at 13°; the number of foliage leaves increased until about the time the bulbs reached half maximum diameter; thereafter the number declined, due to cessation of new foliage leaves and senescence of old leaves. In all plants at 13°, visible bulbing occurred before emergence of the scape. Bulbs matured earliest at 29° but yields were highest at 18° and 24°. The length of bulbs increased with increasing temperature, but the diameters were not significantly different, resulting in very elongated bulbs at high soil temperatures. Soil temperature had no effect on lateral bud formation (doubles). Pungency or votatile propyl sulfur compounds were highly correlated with temperature but percent dry wt, total sugars, and bulb pinking were not correlated.