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  • Author or Editor: M. Angell x
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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

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