[Behaviour of the maize lines S1 under the limited humidity conditions] | Comportamiento de lineas S1 de maiz bajo condiciones de humedad restringida
1997
Vega Sanchez, M.C. | Arreola Garcia, J. | Guerrero O, J.L. | Navarro G., E. | Espinoza V., J.
This research was carried out during 1991 in two test environments under irrigation and rainfed conditions in the state of Coahuila, Mexico, to evaluate using two testers groups of S1 lines from the "NEPO" population, known for its high grain lysine content, and to assess line performance under a system of irrigation drought. A total of 133 test crosses were made and compared to six hybrids (five experimentals and one commercial), using a random block design and two replications per environment. The experimental units comprised rows 4.4 m long, with a distance of 0.8 meters between rows. Results showed that test crosses surpassed the best check by 7 Per cent and 11 Per cent for ear yield under irrigation and drought, respectively. Yields under tile two conditions ranged from 7.70 to 0.84 t ha-1 and 7.06 to 1.49 t ha-1, respectively. An outstanding group of S1 lines was identified for yield (4-5 t ha-1), general combining ability and other agronomic traits in both environments. However, only four lines were selected based on having a drought index 1, which indicates their adaptability for environments with low rainfall. We conclude that the irrigation-drought system was efficient for selecting S1 lines and that Tester 1 (Compuesto Norteno C2) was the best at discriminating among lines. With the selected genotypes, we are in a position to obtain better hybrids and better nutritional quality than with the commercial hybrid "AN- 310," which is widely accepted in various rainfed zones in the country.
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