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- Author or Editor: Teme P. Hernandez x
Abstract
Fruit set of 6 genotypes of tomato (Lycopersicon esculentum Mill) ranged from 50% (BL6807) to l% (L401) in the summer and from 93% (BL6807) to 78% (L401) in the spring. Flower drop was significantly higher in the summer for each cultivar, except for BL 6807 where there was no difference. All genotypes had significantly more underdeveloped ovaries in the summer and generally less normal pollen, smaller fruit, and less seed per fruit. Although these variables were related to low fruit set at high temperatures, they were not primarily responsible for this character.
Abstract
Breeding tomatoes for resistance to fruit cracking was started in Louisiana in 1960. Varieties and lines used in these tests were ‘Pinkdeal’, ‘Floralou’, ‘Glamour’, L70 and L125, as resistant to moderately resistant parents, and L92 as a very susceptible line. Crosses were made to get the possible combinations of F1 F2 and backcrosses of ‘Pinkdeal’, ‘Floralou’ with L92.
In crosses of ‘Pinkdeal’ and ‘Floralou’, with L92 partial dominance of genes controlling fruit crack resistance was found. The F2 data showed a skewness of plant distribution toward the resistant parent. From the backcross progenies of ‘Pinkdeal’ × L92 × ‘Pinkdeal’, L70 was selected after 8 filial generations as a recombination having a high level of fruit crack resistance in conjunction with good horticultural characters. Tomato lines L161 and L210 resulted from a cross of L70 × L125 and these lines were pressure selected for 6 or more generations for fruit crack resistance, good horticultural characters and root knot nematode resistance. L147 resulted from a cross of ‘Glamour’ × L92; it has good horticultural characters. These lines demonstrated highly significant levels of fruit crack resistance and good productivity on field tests for several years.
Abstract
Serious effects of wet soil on fleshy roots of sweet potato (Ipomoea batatas (L.) Lam) were losses from rots at harvest and increased shrinkage losses in storage. Other injurious effects were losses in storage of carotenoid pigments, dry matter content, and baking quality. Highly significant differences occurred among cultivars. Total yield was significantly negatively correlated with dry matter content of fleshy roots in 1975 (r = −0.22) and in 1976 (r = −0.17). Dry matter content of sweet potatoes at harvest was significantly negatively correlated with weight loss from rots after 30 days storage in 1975 (r = −0.20). The weight loss from root shrinkage during curing and after 30 days of storage was positively correlated in 1975 (r = 0.73) and in 1976 (r = 0.87). Significant differences between cultivars from the control treatment occurred in shrinkage losses over a 140 day storage period in normal storage treatment.
Abstract
Seven tomato genotypes (Lycopersicon esculentum Mill) were crossed in all except reciprocal combinations in a diallel test for heat tolerance. S6916 had the highest general combining ability (GCA) value for heat tolerance, indicating that it transmitted good fruit setting abilty at high temperatures to its progeny. BL6807 had the second highest GCA value for fruit set but also transmitted underdeveloped ovaries. L401 had the lowest GCA value for fruit set. Additive gene action was more important than nonadditive effects for fruit set, flower drop, and underdeveloped ovaries at high temperatures.
Abstract
‘Travis’ is an early maturity, high yielding sweet potato cultivar with resistance to soil rot, Streptomyces ipomoea [(Persons & W.J. Martin) Waks & Henrici] released by the Louisiana Agricultural Experiment Station in 1980. It produces high yield of well shaped rose skin colored roots with a deep orange flesh. ‘Travis’ also has resistance to Fusarium wilt, root-knot and internal cork virus. ‘Travis’ was grown from true seed in 1974 and tested as ‘L4-62’.
Abstract
‘Eureka’, a soil rot-resistant, high-quality sweet potato (Ipomoea batatas L.) formerly tested under the designation of L4-131, was developed by the Louisiana State University Agricultural Experiment Station and is jointly released by Louisiana State University Agricultural Experiment Station and the University of California Agricultural Experiment Station.