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  • Author or Editor: James F. Fontenot x
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Double-stranded ribonucleic acid (dsRNA) was found associated with 51 of 80 healthy pepper (Capsicum annuum L., C. frutescent L., C. chinense Jacq.) cultivars analyzed. In general, dsRNAs were consistent within particular cultivars. Twelve distinct dsRNA profiles that varied in the number and size of the dsRNA segments were obtained. All bell and pimento pepper cultivars analyzed had a similar dsRNA profile. Furthermore, all six cherry pepper cultivars tested were free of dsRNAs. However, an association between the dsRNA profile and the pepper group was not obtained with other cultivars. Selected dsRNAs were transmitted at a high rate through the seed of self-pollinated plants but were not transmitted through grafts to plants that lacked them.

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Only one of 12 chemical compounds was effective in stimulating suberization and wound periderm activity in cut potato seed pieces. Polyram applied as a 7% dust had a consistently favorable effect on suberization. However, it did not stimulate wound periderm activity as efficiently as it did suberization in cut seed pieces from any of the clones.

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The inheritance of multiple flowers and leaf pubescence resulting from the crosses between accessions from pepper species Capsicum annuum L. and C. chinense Jacq. was examined. Hand cross- and self-pollinations were made in a glass greenhouse. Only eight normal F1 plants were obtained from crosses between the two species when C. annuum L. was the female parent. F2 and backcross generations obtained from the F, and the two parents were grown in the field. Two field studies indicated that multiple flowers and leaf pubescence were controlled by dominant genes. A three-gene model leading to an F2 segregation ratio of 45:9:10 and a two-gene model leading to an F2 segregation ratio of 13:3 were suggested for the inheritance of multiple flowers and leaf pubescence, respectively. Epistasis was evoked in the interpretation of the data. No linkage was found between the two characters. The inconsistencies between F2 and backcross data might be due to selective elimination of genes from one or the other parent in an Interspecific hybridization. Segregation ratios from intraspecific crosses for leaf pubescence supported a two-gene model and gave an F2 ratio of 13 pubescent leaf : 3 glabrous leaf progeny.

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