| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Facultad de Ciencias Agrarias, Universidad Católica Argentina, Gral. Ramón Freire 183, (1426) Buenos Aires, Argentina.
Unidad Integrada Balcarce, CC 276 (7620), Balcarce, Buenos Aires, Argentina.
Facultad de Ciencias Agrarias, Universidad Católica Argentina, Gral. Ramón Freire 183, (1426) Buenos Aires, Argentina.
* Corresponding author (menegot{at}mdp.edu.ar).
This study analyzes differences in potential yield among six semidwarf awned spring bread wheat (Trilicum aestivum L.) cultivars recently selected in Argentina. Yield was considered as the product of number of grain per square meter (NG) and weight per grain. The NG was analyzed in terms of (i) duration of the inflorescence growth period (excluding grains), (ii) crop growth rate during that period, (iii) partitioning of crop dry matter to spikes during the same period, and (iv) grain/spike weight ratio (i.e., number of grains per gram of spike). The data were obtained from two field experiments in the Province of Buenos Aires. Grain yield (range: 453–689 g m–2) was related more to NG (range: 13.3–21.3 x 103 grain m–2) than to weight per grain. Duration of spike growth period was the same (27 d) for all cultivars. During this period, intercepted photosynthetically active radiation, radiation-use efficiency (mean: 2.7 ± 0.28 g MJ–1), and crop growth rate (mean: 26 ± 2.5 g m–2 d–1) were similar for all the cultivars examined. Differences among cultivars in partitioning to spikes (ranges: 28–34%) were significant. The NG, however, was not related to partitioning to the spike. There were clear differences among cultivars in the grain/spike weight ratio (range: 61–106 grain g–1); NG was more closely related to this ratio (r = 0.96, P < 0.01) than to dry weight of spikes at the end of their growth period (r = –0.30). Increments in potential yield by means of high grain/spike weight ratio were not previously reported and may be a path to future potential yield improvements.
Received for publication May 16, 1997.
This article has been cited by other articles:
|
|
 |
|
  F. D. Meyer, L. E. Talbert, J. M. Martin, S. P. Lanning, T. W. Greene, and M. J. Giroux Field Evaluation of Transgenic Wheat Expressing a Modified ADP-Glucose Pyrophosphorylase Large Subunit Crop Sci., February 6, 2007; 47(1): 336 - 342. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Y. Zhou, Z. H. He, X. X. Sui, X. C. Xia, X. K. Zhang, and G. S. Zhang Genetic Improvement of Grain Yield and Associated Traits in the Northern China Winter Wheat Region from 1960 to 2000 Crop Sci., January 22, 2007; 47(1): 245 - 253. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 N. G. Izquierdo, L. A.N. Aguirrezabal, F. H. Andrade, and M. G. Cantarero Modeling the Response of Fatty Acid Composition to Temperature in a Traditional Sunflower Hybrid Agron. J., April 11, 2006; 98(3): 451 - 461. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
V. J. Shearman, R. Sylvester-Bradley, R. K. Scott, and M. J. Foulkes Physiological Processes Associated with Wheat Yield Progress in the UK Crop Sci., January 1, 2005; 45(1): 175 - 185. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
P. E. Abbate, J. L. Dardanelli, M. G. Cantarero, M. Maturano, R. J. M. Melchiori, and E. E. Suero Climatic and Water Availability Effects on Water-Use Efficiency in Wheat Crop Sci., March 1, 2004; 44(2): 474 - 483. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M.P. Reynolds, S. Rajaram, and K.D. Sayre Physiological and Genetic Changes of Irrigated Wheat in the Post-Green Revolution Period and Approaches for Meeting Projected Global Demand Crop Sci., November 1, 1999; 39(6): 1611 - 1621. [Abstract] [Full Text]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Agronomy Journal | Vadose Zone Journal | |||
| Journal of Natural Resources and Life Sciences Education |
Soil Science Society of America Journal | ||||
| Journal of Plant Registrations | Journal of Environmental Quality |
The Plant Genome | |||
