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 Boerma, H. R. Articles by Ashley, D. A. Search for Related Content PubMed Articles by Boerma, H. R. Articles by Ashley, D. A. Agricola Articles by Boerma, H. R. Articles by Ashley, D. A.

Canopy Photosynthesis and Seed-Fill Duration in Recently Developed Soybean Cultivars and selected Plant Introductions

Dep. of Agronomy, Univ. of Georgia, Athens, GA 30602

^* Corresponding author.

Canopy photosynthesis and seed-fill period have been shown to be positively related to seed yield in soybean [Glycine max (L.) Merr.]. The present study was undertaken to identify recently developed cultivars (RC) and plant introductions (PI) with high canopy-apparent photosynthesis (CAP) or long seed-fill period and to determine the relationship of these traits to seed yield in these genetically diverse genotypes. Twenty genotypes in Maturity Groups (MG) VI, and VII were grown on an Appling course sandy loam soil (Typic Haplndult, clayey, kaolinitic, thermic) near Athens, GA, for 2 yr. The genotypes consisted of seven RC, seven PI, which had been previously identified as having high seed yield, three high photosynthetic cultivars (HPC), and three low photosynthetic cultivars (LPC). Five CAP measurements were taken during the reproductive stage of development. When averaged over maturity groups, the RC were 5% higher in CAP than the LPC and 13% higher than the PI. The RC and HPC had 4 to 5 days longer seed-fill period than PI or LPC. The RC averaged 12% higher in seed yield then the LPC and 6% higher than PI. In MG V, PI157440 and the RC ‘Deltapine 345’ had CAP rates higher than the LPC ‘Dare’ and equal to the HPC ‘Forrest’. In MG VII, ‘GaSoy 17’ had a CAP rate above the HPC ‘Bragg’. Partial correlation coefficients with the effect of maturity removed were positive between seed yield and CAP (r = 0.63), seed-fill period (r = 0.54), and the product of CAP and seed-fill period (r = 0.78). These results indicate that high photosynthetic capacity and long seed-fill period were associated with high seed yield in this diverse group of genotypes.

Key Words: Glycine max L. Merr. • Seed yield • Maturity groups • Carbon dioxide exchange • Reproductive development

Received for publication April 17, 1987.

This article has been cited by other articles:

				D. B. Egli Comparison of Corn and Soybean Yields in the United States: Historical Trends and Future Prospects Agron. J., May 7, 2008; 100(Supplement_3): S-79 - S-88. [Abstract] [Full Text] [PDF]

				V. O. Sadras and D. B. Egli Seed Size Variation in Grain Crops: Allometric Relationships between Rate and Duration of Seed Growth Crop Sci., March 19, 2008; 48(2): 408 - 416. [Abstract] [Full Text] [PDF]

				S. Kumudini, J. Omielan, and D. J. Hume Soybean Genetic Improvement in Yield and the Effect of Late-Season Shading and Nitrogen Source and Supply Agron. J., February 29, 2008; 100(2): 400 - 405. [Abstract] [Full Text] [PDF]

				K. J. Boote, J. W. Jones, W. D. Batchelor, E. D. Nafziger, and O. Myers Genetic Coefficients in the CROPGRO-Soybean Model: Links to Field Performance and Genomics Agron. J., January 1, 2003; 95(1): 32 - 51. [Abstract] [Full Text] [PDF]