HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Burton, J. W. Articles by Walter, W. M. Search for Related Content PubMed Articles by Burton, J. W. Articles by Walter, W. M., Jr. Agricola Articles by Burton, J. W. Articles by Walter, W. M.

Methionine Concentration in Soybean Protein from Populations selected for Increased Percent Protein¹

When a component of grain, such as protein or oil, is changed quantitatively through plant breeding, it is important that the quality of that component be maintained. The current study was conducted to determine if protein quality, as measured by methionine concentration, had changed as a result of recurrent selection for increased protein in four soybean [Glycine max (L.) Merr.] populations.

Selected cycles from four populations were grown in replicated field experiments in 1975 and 1976. Two populations, designated IA and IB, were grown in one environment; the other two, designated IIA and IIB, were grown in another environment. In 1978, populations IA and IIA were tested together in a replicated field experiment in two environments. Percent protein of the seed and methionine concentration of the protein were determined in all experiments.

Differences in methionine concentration among selected cycles of the four populations tested in 1975 and 1976 were generally small. Therefore, selection for high percent protein in the soybean populations did not result in large changes in methionine levels in the protein. Population IA protein had a lower mean concentration of methionine than population IIA.

When populations IA and IIA were tested together in two environments in 1978, differences in methionine percentage of the protein among cycles of selection were nonsignificant, as before. However, the average methionine concentration of the two were similar and location by cycle interactions were highly significant. These results suggest that the differences in methionine concentration, previously observed between populations I and II, were a result of environmental influences. The lack of relationship between protein percent and methionine concentration of protein demonstrates that methionine is not likely to decrease as a result of selection for higher protein, at least not in early cycles of selection

Key Words: Protein quality • Selection • Glycine max (L.) Merr.

² Research agronomist, USDA-SEA-AR and assistant professor of Crop Science, North Carolina State Univ.; research chemist, USDASEA-AR and professor of food science, present address: Dep. of Food Science and Nutrition, Brigham Young Univ., Provo, UT 84602: and research chemist, USDA-SEA-AR and professor of food sciences. North Carolina State Univ., Raleigh, NC 27650.

Received for publication May 1, 1981.

This article has been cited by other articles:

				H. B. Krishnan Engineering Soybean for Enhanced Sulfur Amino Acid Content Crop Sci., January 31, 2005; 45(2): 454 - 461. [Abstract] [Full Text] [PDF]

				J. R. Wilcox and R. M. Shibles Interrelationships among Seed Quality Attributes in Soybean Crop Sci., January 1, 2001; 41(1): 11 - 14. [Abstract] [Full Text] [PDF]