Seed Protein Levels Research Articles

PRO 30-05 Soybean

PRO 30-05 is a 3050 crop heat unit (CHU) soybean [Glycine max (L.) Merrill] cultivar with excellent yield potential, good lodging resistance and above-average seed protein levels. It was developed by the Ridgetown College, University of Guelph, and is adapted to the 2900-3250 CHU areas of Ontario. Key words: Soybean, cultivar description

AC Vin-Pro soybean

AC Vin-Pro is a large-seeded soybean [Glycine max (L.) Merr.] cultivar with elevated seed protein levels. AC Vin-Pro has yellow hila and acceptable tofu processing quality for foreign and domestic markets. Its brighter seed colour should make it attractive to the Japanese miso market. Key words: Glycine max (L.) Merr. soybean, cultivar description, tofu-type

AC Hime soybean

AC Hime is a large-seeded soybean [Glycine max (L.) Merr.] cultivar with elevated seed protein levels. AC Hime has yellow hila and acceptable tofu processing quality for foreign and domestic markets. Key words: Glycine max (L.) Merr., soybean, cultivar description, food grade cultivar, tofu

AC X790P soybean

AC X790P is a large-seeded soybean [Glycine max (L.) Merr.] cultivar with elevated seed protein levels. AC X790P has yellow hila, lacks the a4 protein sub-unit of the 11S glycinin, and has acceptable tofu processing quality for foreign and domestic markets. Key words: Glycine max (L.) Merr. soybean, cultivar description, tofu-type

AC Proteina soybean

AC Proteina is a 2550 crop heat unit soybean [Glycine max (L.) Merr.] cultivar with seed protein levels about 6% higher than oilseed cultivars. AC Proteina is intended for whole-seed use in livestock rations. Key words: Soybean, cultivar description, high protein cultivar

AC Hercule soybean

AC Hercule is a 2600 crop heat unit soybean (Glycine max [L.] Merr.) cultivar with seed protein levels about 3–4% higher than oilseed cultivars. AC Hercule is intended for whole-seed use in livestock rations. AC Hercule has field tolerance to phytophthora root rot. Key words: Soybean, cultivar description, high protein cultivar

Fifty‐Eight Years of Genetic Improvement of Short‐Season Soybean Cultivars in Canada

Soybean [Glycine max (L.) Merr.] production in short‐season areas has increased greatly because of improvements in cultivars and production practices. Previous studies of genetic improvement in soybean have reported yield increases of 0.5 to 1% per year. To evaluate the genetic improvement of short‐season germplasm, 41 cultivars ranging from maturity group 000 to 0, released from 1934 to 1992, were grown for 8 station‐years in Ontario and Quebec. Yield, maturity, plant height, lodging score, 100‐seed weight, seed protein and oil levels, and yield stability were regressed on year of release to determine if improvements have been made. Yield has been improved about 0.5% per year during the period under study; however, since 1976 yield has been improved about 0.7% per year. There is evidence that the rate of genetic improvement of seed yield is accelerating. Significant lodging reduction was also observed. Seed protein levels have been reduced 4 g kg‐1 yr‐1 and seed oil levels have increased 4 g kg‐1 yr‐1. Although yield has been increased, yield stability has remained constant.

AC Proteus soybean

AC Proteus is a 2500 crop heat unit soybean [Glycine max (L.) Merr.] cultivar with seed protein levels about 6–9% higher than oilseed cultivars. AC Proteus is intended for whole-seed use in livestock rations. AC Proteus has field tolerance to phytophthora root rot and resistance to powdery mildew. Key words: Soybean, cultivar description, high protein cultivar

Agronomic Performance and Economic Value of High-Seed-Protein Soybean

The long-term trend in relative value of soybean (Glycine max (L.) Merr.] protein and oil is toward greater value of protein, thus furthering interests in the potential for increasing seed protein concentration in soybean. If a change in U.S. soybean breeding strategy for improving seed protein levels is required, it should be based on sound economic and biological principles. This research was conducted to: (i) develop high-protein soybean germplasm adapted to Mid-Atlantic latitudes; and (ii) compare agronomic performance, economic value, and stability of performance of resulting genotypes with that of normalprotein soybean cultivars. Fifty-two high-protein soybean lines were developed and evaluated in field tests in 1988 and 1989. Seven of the highest yielding high-protein lines, seven advanced commercial lines, and 'Essex' were evaluated in 11 field tests in 1990 [...]

Nitrogen Metabolism of Normal and High‐Seed‐Protein Soybean

Nitrogen metabolism differences, including N2 fixation, between high‐and normal‐seed‐protein soybean [Glycine max (L.) Merr.] lines of equivalent plant maturity and seed yielding ability have not been determined in field tests. A replicated field experiment was conducted in 1985 and 1986 to determine such differences on a Mattapex silt loam (fine, silty, mixed, mesic Aqualfic Hapludult) with low soil N. The study used the nodulating‐nonnodulating N difference method to estimate N2 fixation of two soybean lines with contrasting seed protein levels. Eight sequential harvests were conducted from R5 (beginning seed) to combine harvest for the dry weights and N contents of vegetative and reproductive portions of the plants. There was no significant difference between the 2‐yr mean seed yields of the high‐ and normal‐protein lines, but the high‐protein line was 2 d later in maturity. The high‐protein line accumulated more N, fixed more N2, and remobilized more N to the seed than did the normal‐protein line (231 vs. 194, 114 vs. 77, and 87 vs. 76 kg ha−1, respectively). The greater N accumulation by the high‐protein line resulted from N2 fixation being sustained until the late R6 (full seed) stage. Nodule occupancy by strains of Bradyrhizobium japonicum was similar for the high‐ and normal‐seed‐protein lines. Thus, the ability to sustain N2 fixation until later stages of reproduction is a host plant attribute that may contribute to the greater N metabolism of a high‐seed‐protein soybean.

Growth, yield components and seed composition of two soybean cultivars as affected by manganese supply

The influence of manganese nutrition on growth and yield of two soybean cultivars (Lee and Bragg) was studied in sand culture. Increasing the manganese concentration from 1.0�M to 275�M reduced vegetative growth and grain yield in both cultivars, the reduction being greater for Bragg than for Lee. The reduction in grain yield at high manganese levels resulted mainly from a reduced individual seed weight and a lower number of pods, with a slight reduction in the number of fertile nodes. There was no effect of high manganese supply on oil and protein levels or on the germination percentage of harvested seed. Manganese deficiency reduced vegetative growth, advanced flower initiation and pod formation, and decreased the grain yields of both cultivars. The reduced seed yield was mainly due to a reduction in the number of pods per plant and the individual seed weight. Manganese deficiency also reduced the concentration of oil in the seeds, but there was no effect on seed protein level or on the germination percentage cf harvested seed. Seed manganese concentration increased with the supply of the nutrient, but no difference in concentration was found between the two cultivars.