| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Dpto. de Producción Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Avda. San Martín 4453 (1417), Buenos Aires, Argentina
* Corresponding author (E-mail: rvotegui{at}criba.edu.ar).
Kernel number (KN) per plant declines with increasing plant population (PP) in maize (Zea mays L.) and controversy exists about the critical period for spikelet abortion. In this work, the effect of PP (5 and 9 plants m–2) on floral differentiation and kernel set was analyzed for two genotypes of contrasting prolificacy at Grignon, France, (48°51'N). Kernel set variability was tested at Balcarce (37°45'S), Argentina, with three PP (2, 8, and 16 plants–2) and athinning treatment (from 16 to 2 plants m–2) at silking. Plants were grown with no water or nutrient restrictions. At 9 plants m–2, floral differentiation was delayed in apical ears but almost all spikelets started silk elongation. In subapical ears, 17% of the spikelets of the nonprolific hybrid and 19% of the prolific hybrid had not completed development at silking. At 5 plants m–2 these proportions were reduced to 6%. Significant (P < 0.01) differences were detected in apical ear length after the onset of rapid ear growth (silking –20 d), resulting in reduced ear biomass at silking at high PP. Barrenness occurred at 16 plants m–2 (0.5 ears plant–1), but spikelet abortion took place in all apical ears after silking, except at 2 plants m–2 (control). Kernel number per plant was not related to the degree of floral differentiation reached at silking, but to the amount of intercepted photosynthetically active radiation (KN = 149.5 + 204.6 MJ plant–1 d–1, r2 = 0.92) when the silking –15-d period was included in the calculations. Presilking limitations to ear growth appear to reduce ear sink strength.
Received for publication October 24, 1995.
This article has been cited by other articles:
|
|
 |
|
  J. I. Lizaso, A. E. Fonseca, and M. E. Westgate Simulating Source-Limited and Sink-Limited Kernel Set with CERES-Maize Crop Sci., September 1, 2007; 47(5): 2078 - 2088. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Carcova and M. E. Otegui Ovary Growth and Maize Kernel Set Crop Sci., May 31, 2007; 47(3): 1104 - 1110. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 W. J. Cox, R. R. Hahn, and P. J. Stachowski Time of Weed Removal with Glyphosate Affects Corn Growth and Yield Components Agron. J., March 2, 2006; 98(2): 349 - 353. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. M. Hashemi, S. J. Herbert, and D. H. Putnam Yield Response of Corn to Crowding Stress Agron. J., May 13, 2005; 97(3): 839 - 846. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. I. Lizaso, M. E. Westgate, W. D. Batchelor, and A. Fonseca Predicting Potential Kernel Set in Maize from Simple Flowering Characteristics Crop Sci., May 1, 2003; 43(3): 892 - 903. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Carcova, B. Andrieu, and M. E. Otegui Silk Elongation in Maize: Relationship with Flower Development and Pollination Crop Sci., May 1, 2003; 43(3): 914 - 920. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. Uribelarrea, J. Carcova, M. E. Otegui, and M. E. Westgate Pollen Production, Pollination Dynamics, and Kernel Set in Maize Crop Sci., November 1, 2002; 42(6): 1910 - 1918. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. Borras, J. A. Cura, and M. E. Otegui Maize Kernel Composition and Post-Flowering Source-Sink Ratio Crop Sci., May 1, 2002; 42(3): 781 - 790. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Carcova and M. E. Otegui Ear Temperature and Pollination Timing Effects on Maize Kernel Set Crop Sci., November 1, 2001; 41(6): 1809 - 1815. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. Borras and M. E. Otegui Maize Kernel Weight Response to Postflowering Source-Sink Ratio Crop Sci., November 1, 2001; 41(6): 1816 - 1822. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. R.C. Vega, F. H. Andrade, V. O. Sadras, S. A. Uhart, and O. R. Valentinuz Seed Number as a Function of Growth. A Comparative Study in Soybean, Sunflower, and Maize Crop Sci., May 1, 2001; 41(3): 748 - 754. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Cárcova, G. A. Maddonni, and C. M. Ghersa Long-Term Cropping Effects on Maize: Crop Evapotranspiration and Grain Yield Agron. J., November 1, 2000; 92(6): 1256 - 1265. [Abstract] [Full Text]
|
|
|
|
|
|
J. Cárcova, M. Uribelarrea, L. Borrás, M. E. Otegui, and M. E. Westgate Synchronous Pollination within and between Ears Improves Kernel Set in Maize Crop Sci., July 1, 2000; 40(4): 1056 - 1061. [Abstract] [Full Text]
|
|
|
|
|
|
F. H. Andrade, M. E. Otegui, and C. Vega Intercepted Radiation at Flowering and Kernel Number in Maize Agron. J., January 1, 2000; 92(1): 92 - 97. [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 | |||
