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- Author or Editor: Casimir A. Jaworski x
Caphea glutinosa is a herbaceous, low-growing annual, bearing numerous attractive purple flowers and has potential as an ornamental and as a ground cover. Plants exhibit winter hardiness in USDA plant hardiness zone 8. Tissue culture techniques were developed to obtain large numbers of uniform plants. Whole leaf explants (approximately 1.0 cm2) callused profusely in MS (Murashige and Skoog, 1962) medium containing 84 mM sucrose, 1% (w/v) Difco Bacto agar and 8.8 μM N6benzyladenine. Shoot formation from calli was observed in the same medium 4 weeks after explanting. Detached shoots were rooted (100%) in half strength MS medium and rooted shoots were transferred to Promix® in the greenhouse 2 weeks after rooting. Tissue cultured plants flowered after 60 days in the greenhouse and no phenotypic differences were observed in floral or foliar characteristics.
Nuclear male-sterile mutants may occur regularly in self-pollinated crops (Frankel and Galum, 1977). Male sterility has been reported in eggplant (Solanum melongena L.) (Chauhan, 1984; Jasmin, 1954; Nuttall, 1963). Heterosis in eggplant was discussed by Sambandum (1962). Most intercultivar crosses of eggplant express hybrid vigor and improved characteristics of economic importance, particularly yield (Sambandum, 1962). UGA 1-MS is released as a germplasm source for male sterility, a trait that should facilitate the development of commercial hybrids (Driscoll, 1985).
The herbicide metribuzin is registered for use on tomatoes (Lycopersicon esculentum Mill.). It is applied either preplant incorporated or postemergence. However, severe injury occurs when postemergence applications are made during low light conditions (1,2, 4, 5, 6). UGA 1113MT and UGA 1160MT are being released as sources of tolerance to metribuzin; both lines have exhibited excellent tolerance (no injury) to metribuzin applications (up to 16-times the recommended rate of 1.12 kg/ha) made during cloudy weather. Chemical name used: 4-amino-6-tert-butyl-3-(methylthio)-as-triazin-5(4-H)-one (metribuzin).
The functional male sterile (fms) eggplant (Solanum melohgena L.) germplasm UGA 1-MS was crossed with two cultivars, `UGA 18 White' and `Florida Market' with normal anthers to derive F1, F2, and BC populations. Functional male sterility (fms) was governed by a single recessive allele. The gene symbol fms is proposed for this male sterile characteristic. The functional male sterility gene was linked to purple fruit color at the X/x locus. Our observations also revealed that the purple or violet color ware not only on the fruit peel, but also on the anthers and leaf buds if the eggplant fruit was purple or violet. In the transmission of parents and progenies of the cross of UGA 1-MS × `UGA 18 White', the purple line on the anther and leaf bud purple color ware tightly associated with fruit purple color. Thus, it is assumed that the allele X controls not only purple fruit, but also the expression of the purple line on the anther and purple leaf bud.
Tomato transplants were packed 4 ways: 1) conventionally, 2) densely, 3) with soil adhering to the roots, and 4) moist plants with moist soil adhering to the roots. During transit from Georgia to Ohio, the temperature in those crates that were packed densely was 4° to 5°C higher than any of the other treatments. Furthermore, plant survival and subsequent yields in the field were reduced by packing too densely. When tomato transplants were stored at 10°, 16°, 21°, and 27° for 4 days, the percentage of dry matter in plant stems increased, and the survival of transplants decreased with increased storage temperature.
Leaf intumescences of 16 Cuphea species were evaluated in three greenhouse tests. Cuphea crassiflora S.A. Graham had the greatest severity of leaf intumescences followed by C. tolucana Peyr. and C. wrightii A. Gray. Cuphea koehneana Rose, C. inflata S.A. Graham, C. lanceolata Ait., and C. leptopoda Hemsley had fewer than 10% of the leaves with intumescences. Cuphea carthagenensis (Jacq.) Macbr., C. glutinosa Chamb. & Schldl., C. hookeriana Walp., C. paucipetala S.A. Graham, and C. procumbens Gomez O. were free of leaf intumescences. Leaf intumescences for C. wrightii ranged from 100% for seed accession number A0243 to 0% for seed accession numbers A0378 and A0305. White flies (Trialeurodes vaporariorum Westwood) did not contribute to leaf intumescences development.
The effect of daminozide as a plant growth retardant to protect potato seedlings from metribuzin injury was investigated. Plants of 6 potato cultivars were sprayed 42 days after planting with daminozide at 0, 2500, 5000 ppm concentrations. Four days after daminozide treatment, metribuzin at 0.56 kg/ha was applied. Within 3 days after metribuzin treatment, differences between potato cultivars in metribuzin tolerance was observed. Seven days after metribuzin application 25.2% to 42% of the control plants had more than 20% necrosis, and of this percentage, 0% to 13.9% plants were dead. Only 2.3% to 10.7% of the plants exhibited more than 20% metribuzin injury when pretreated with 2500 ppm daminozide. Potato plants treated with 5000 ppm daminozide were not damaged. The soluble solids of stem sap increased with daminozide rate. Protection from metribuzin injury in potato was associated with the increase in soluble solids in daminozide treated plants. Chemical name used: butanedioic acid mono (2, 2-dimethylhydrazide) (daminozide).