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  • Author or Editor: F. F. Angell x
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Abstract

Dominant monogenic control of purple petiole (G) over green (g) was found in the carrot. Variations observed in intensity of purple suggested presence of modifier genes. Plants having purple petioles were easily identified at all stages of growth following true-leaf formation.

Open Access

Abstract

A technique developed for inoculating tomato fruits with anthracnose pathogen consists of placing a spore suspension droplet onto a fruit with a hypodermic syringe and then pricking the epidermis under the droplet with the hypodermic needle. Disease symptoms occurred at room temperature and humidity, thus eliminating the need for controlled temperature and humidity. Detectable lesions developed at 95% and 96% of inoculated sites on ‘Heinz 1350’ and ‘Roma’ fruits, respectively.

Open Access

Abstract

Four processing tomato cvs. Chico III, Merit, Dorchester and Campbell 28 were sampled biweekly throughout the harvesting season in 1972 and 1973. Seasonal variation was noted in soluble solids, pH, ascorbic acid and color. The color and pH of tomatoes reached maximum values between 89 and 105 days after planting while soluble solids were generally higher between 76 and 106 days after planting. There was no trend in the variation of ascorbic acid throughout the sampling period. In some cases, however, there was a lower ascorbic acid content in fruits toward the end of the harvesting season. Of 5 climatic factors measured in both years, temperature and radiation were implicated as affecting tomato fruit quality.

Open Access

Abstract

Resistant plant introduction (P.I.) 129027 was hybridized with susceptible ‘Roma’ and ‘Heinz 1350’, and P.I. 127833 was hybridized with ‘Heinz 1350’. Plants of 6 populations (P1, P2, F1, F2, B1P1, and B1P2) of each of 3 crosses (127833 × ‘Roma’, 127833 × ‘H-1350’, 129027 × ‘Roma’) were field-grown and fruits were inoculated in a laboratory. Genetic analysis indicated presence of a leading factor and that 6 genes might be involved in anthracnose reaction. Resistance was partially dominant to susceptibility, and genetic variance was non-additive.

Open Access

Abstract

Dormancy of non-cooled Lilium longiflorum Thunb. cv. Ace bulbs was broken with GA3 (1000 ppm), while ABA (500 ppm) partially negated the effect of vernalization on dormancy breaking. Infusion of bulbs with GA3 or ABA had little effect on days to anthesis. Injections of GA3, GA4, or GA7 into shoots from non-cooled bulbs did not substitute for vernalization or affect days to anthesis. ABA injections into shoots from cooled bulbs partially negated the effect of vernalization and delayed anthesis. Injections of GA3 or GA7 into shoots from cooled bulbs decreased days to anthesis, while GA3, GA4 or GA7 increased plant height. ABA delayed anthesis and reduced stem elongation. The major effect of exogenous GA applications appears to stimulate bolting.

Open Access

Abstract

Data from 2 experiments, each involving a set of 6 muskmelon cultivars grown over a period of 4 years, were subjected to joint regression analysis to characterize performance across environments. ‘Burpee’ and ‘Gold Star’ were common to both experiments. A majority of the cultivars exhibited linear response for yield but not for fruit characteristics. There were also significant differences in regression coefficients among cultivars in each experiment. ‘Burpee’ and ‘Gold Star’ each had similar joint regression coefficients in both experiments for total weight of fruit per plant, but not for total number of fruit.

Open Access