Induction of Secondary Dormancy in Seeds of Meadowfoam (Limanthes alba Benth.)
Sam Nyunt and Don F. Grabe
Fall seedings of meadowfoam (Limnathes alba Benth.) in Oregon are usually delayed until early to mid-October because of the possibility of inducing secondary dormancy from earlier planting in warm soils. This experiment was conducted under laboratory conditions to determine if secondary dormancy is induced by warm temperatures or other environmental conditions that are unfavorable to meadowfoam seed germination.
Additional index words: Germination, Temperature, Light, Oxygen.
Effect of Soybean Tissue Potassium Levels on Carpel and Seed Infection by Phomopsis spp. and Seed Germination1
D.M. TeKrony, D.B. Egli, and R. E. Ferriss2
The effect of potassium fertilization on seed infection by Phomopsis spp. and seed quality of four soybean (Glycine max (L.) Merr) genotypes was evaluated for four years on a soil with a low initial available potassium level. Soil potassium applications of 28 to 224 kg ha-1 significantly increased soil test potassium levels and potassium levels in the soybean leaves at growth stage R2 and in carpels at growth stages R6 and R7.
Additional index words: Diaporthe phaseolorum var. sojae, fertilizer rates.
Incidence of Hollow Heart of Pisum sativum on the Pacific Northwest
Thirty-four 1984 pea cultivars and 43,1985 cultivars were evaluated for the presence of hollow heart. All cultivars had the disorder, but incidence and severity were variable.
Additional index words: Physiological disease, Pisum sativum, seed quality, root rot, predisposition.
Seed Laboratory Computerization1
A.G. Maristany and H. R. Danielson2
Seed-Lab, a software system developed at the Oregon State University Seed Testing Laboratory for managing seed laboratory information, is described. Seed-Lab shields the user from the complexities of database management by supporting menu driven inquiries.
Additional index words: seed testing; software; hardware; local area networks (LAN); personal computers.
Review of the Development of Seed Pathological Testing1
J. F. Schoen2
A selective review is presented of some major historical events in the development of seed pathology with an emphasis on testing techniques. Most references are to those scientists who were members of the Association of Official Seed Analysts from the early twentieth century onward. Special recognition is given to the works of several plant pathologists at the University of Minnesota and in the Danish Institute of Seed Pathology.
Additional Index words: seed-borne disease, seed health, seed pathology.
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Fungi Associated With Forest Seeds in the Philippines
Sebastian S. Quiniones1
Seeds of 33 forest species belonging to 28 genera in 12 families of tropical trees were studied for health. The blotter, agar, and sand medium methods were used. The common genera of fungi found associated with the seeds were: Fusarium, Colletotrichum, Botryodiplodia, Cladosporium, Phoma, Phomopsis, Macrophoma, Cephalosporium, Aspergillus, Penicillium, Curvularia and Chaetomium. Details about their distribution and description are discussed in the text of this paper.
Additional index words: seed-borne, field contaminants, blotter and agar methods, sand medium.
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Changes in Structure of Pit and Antipit in Soybean Seeds and Seedling Development1
R.W. Yaklich, E.L. Vigil, and W.P. Wergin2
This study examined the fate of the pit on the abaxial surface of the cotyledon and that of the antipit on the inside surface of the seed coat. Samples of cotyledon and seed coat tissue from germinating and developing seedlings of soybean (Glycine max L. Merr.) were separated for scanning electron microscopy following initial fixation in glutaraldehyde. Holes which surrounded the antipit in seed coats of mature seeds were not observed after 1 day of imbibition.
Additional index words: Glycine max (L.) Merr., cotyledon, seed coat, stomate.