Abstract
A modified Environmental Shift Technique based on use of a disease index (scoring) gave consistent separation between susceptible and moderately resistant pea (Pisum sativum L.) genotypes to Aphanomyces euteiches Drech. root rot in 3 tests. A moderately high association (r = −0.63 to −0.83) between disease index and percentage of plant survival was found in segregating populations. Minnesota 108, moderately resistant to A. euteiches, produced adventitious roots readily at an early stage. Root rot resistance and number of adventitious roots were inherited independently. Broad sense heritability (BSH) ranging between 0.45 and 0.57 for resistance to A. euteiches root rot, and between 0.39 and 0.44 for resistance to Rhizoctonia solani Kuehn stem rot, varied by parental combination, experiment, and method of estimation. However, heritability based on gain by selection in the F3 ranged from 0.28 to 0.46 and from 0.21 to 0.44 for resistance to A. euteiches and R. solani, respectively. Frequency distribution of resistant and susceptible plants suggested quantitative inheritance of resistance to both diseases. Recurrent selection, in which each cycle includes one intermating, selfing, and testing generation, is suggested to improve and transfer resistance.
Abstract
The Coastal Plain Experiment Station announces the release of ‘Georgia Upright’ Brassica oleracea L. (Acephala group) which is resistant to bolting and has upright leaf petioles.
Abstract
NC50-7, ‘Cherokee’ and ‘Mountain Pride’ are mid-season, determinate (sp gene) tomatoes (Lycopersicon esculentum Mill.) developed at the Mountain Horticultural Crops Research Station, Fletcher, N.C. ‘Cherokee’ and ‘Mountain Pride’ are adapted to vine-ripe harvest for local market and shipping. NC507 is useful as a parent in breeding for firmness and crack resistance and, in addition, is the male parent of the F1 hybrid ‘Mountain Pride’.
Abstract
Maize dwarf mosaic (MDM) is an economically serious viral disease of sweet corn (Zea mays L.) in the United States. Early infection by the virus in sweet com can cause stunted growth, delayed maturity, reduced yield, and poor ear quality (5). To aid in alleviating this problem, the Illinois Agricultural Experiment Station announces the release of 8 lines of sweet com germplasm homozygous for the sugary (su) gene with improved resistance to maize dwarf mosaic virus (MDMV). These new lines have been designated: ILM6161a, lLM6222a, ILM6222b, ILM6222c, ILM6222d, ILM6222e, ILM6223a, and ILM6223b.
Abstract
Eleven maize inbreds homozygous for genes sugary (su) and sugary enhancer (se) were developed as a consequence of studies to characterize the effect of se with su on car bohydrates in the kernels (2, 3, 4). These inbreds should provide useful germplasm for the development of sweet com hybrids with superior culinary quality.
Abstract
Hybrid carrots (Daucus carota L.) are gaining a larger share of the market once devoted exclusively to open-pollinated cultivars. The carrot inbred Florida 524 has been used extensively as the male parent in experimental hybrids tested in Florida, California, Wisconsin, Texas, and Arizona. These trials have revealed that Florida 524 has good combining ability for fresh market characteristics. Florida 524 is being released jointly by the University of Florida and the U.S. Department of Agriculture.
Abstract
Six sweet com (Zea mays L.) inbreds homozygous for the genes sugary (su) and sugary enhancer (se) have been developed at the Illinois Agricultural Experiment Station. The se gene is a recessive modifier of the su genotype (2) and results in increased kernel sugar content, sweetness, and tenderness (3). Kernels with the su se genotype contain amounts of sugar comparable to those found in lines homozygous for the shrunken-2 (sh 2) gene but without a concomitant reduction in phytoglycogen (water-soluble polysaccharides) content (4). The high level of phytoglycogen found in su and su se cultivars contributes to their tender, creamy texture.
Abstract
‘Oregon 43’, is a bush green bean (Phaseolus vulgaris L.) of ‘Blue Lake’ type, developed for processing in western Oregon. ‘Oregon 43’ will usually equal or exceed the yield of ‘Oregon 1604’, a currently important cultivar, at smaller sieve sizes. It thus may give more favorable grades and higher return to the grower, but, pod wall fiber can develop by the sieve-6 stage of maturity, requiring careful management by processors. General quality of ‘Oregon 43’ has been acceptable for canning and freezing when it is harvested within a normal commercial maturity range. It may be of most value where a large percentage of sieve-4 pods are needed.
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
Oregon 11 is an extremely early tomato (Lycopersicon esculentum Mill.) of small to medium size that has a strong tendency for parthenocarpic fruit set under cool summer conditions. Oregon 11 flowers early and sets fruit under the cool conditions encountered in western Oregon. It was released for breeding purposes and trial in home gardens, where it may be useful in providing ripe fruit before larger, higher quality cultivars begin to ripen.