HERENCIA DEL VIGOR DE PLÁNTULA Y SU RELACIÓN CON CARACTERES DE PLANTA ADULTA EN LÍNEAS ENDOGÁMICAS DE MAÍZ TROPICAL SEEDLING VIGOR INHERITANCE AND ITS RELATIONSHIP TO ADULT PLANT TRAITS IN INBRED TROPICAL MAIZE LINES

In plant breeding programs seed and seedling vigor are important to assure germination, emergence and initial development of the plant. This study was conducted to determine inheritance type of traits related to maize seedling and adult plant vigor and to correlate initial seedling vigor with adult plant traits. To this end, we used the effects of general combinatory aptitude (ACG), specific combinatory aptitude (ACE) and reciprocal effects (ER) obtained from the evaluation of six inbred lines of tropical maize and their direct and reciprocal crosses in a dialelic design. The 30 resulting hybrids were evaluated in Tepalcingo, Morelos, and Iguala, Guerrero, in a randomized complete block experimental design with three replications. We evaluated emergence percentage, initial vigor, vigor index (I), seedling height, days from sowing to 50% masculine and feminine flowering, number of leaves below the ear, total leaf number and plant height. The variation attributable to AGC, ACE and ER was significant (p≤0.01) for all of the traits evaluated, although to a lesser degree for ACE and ER. The dominance variance predominated in seedling traits but not in adult plant traits, for which additive variance was greater. The lines CML 254 and CML 411 (seedling) and CML 399 (adult plant) exhibited high ACG. The reciprocal effects showed that the CML 254 and CML 396 lines, as female parents, produced hybrids with good initial seedling vigor and good development of the adult plant. ER regressions of initial vigor were significant for the ER emergence percentage (R2=0.53), vigor index I (R 2 =0.62) seedling height (R 2 =0.55), leaves below the ear (R2=0.40) and total leaf number (R2=0.26). There was no association between initial vigor and adult plant traits.

[1]  Youngkoo Cho,et al.  Combining ability of seed vigor and seed yield in soybean , 2000, Euphytica.

[2]  S. Y. Sadeghian,et al.  Diallel cross analysis of seed germination traits in sugar beet , 1998, Euphytica.

[3]  J. Mock,et al.  Evaluation of maize plant introductions for cold tolerance , 1978, Euphytica.

[4]  M. Oropeza,et al.  Cruzas dialélicas entre líneas autofecundadas de maíz derivadas de la raza tuxpeño , 2004 .

[5]  Oralia Antuna,et al.  Componentes genéticos de caracteres agronómicos y de calidad fisiológica de semillas en líneas de maíz , 2003 .

[6]  R. Malvar,et al.  Relationships among Kernel Weight, Early Vigor, and Growth in Maize , 1999 .

[7]  R. Kharb,et al.  Prediction of field emergence through heritability and genetic advance of vigour parameters , 1994 .

[8]  C. Bockstaller,et al.  Effects of seed size on maize growth from emergence to silking , 1994 .

[9]  H. Boizard,et al.  La crise de croissance de la plantule de maïs à basse temperature , 1989 .

[10]  A. Hallauer,et al.  Quantitative Genetics in Maize Breeding , 1981 .

[11]  M. Fakorede,et al.  Variability for Seedling Vigour in Maize , 1981, Experimental Agriculture.

[12]  E. Dollinger.  Effects of Visible Recessive Alleles on Vigor Characteristics in a Maize Hybrid 1 , 1985 .

[13]  M. Fakorede,et al.  Relationship between seedling vigor and selection for yield improvement in maize. , 1980 .

[14]  J. Mock,et al.  Cold Tolerance of Maize Inbred Lines Adapted to Various Latitudes in North America 1 , 1979 .

[15]  P. Cooper,et al.  Effects of Seed Size on Growth and Yield of Maize in the Kenya Highlands , 1979, Experimental Agriculture.

[16]  R. J. Baker.  Issues in diallel analysis [a method for studying the genetics of complex traits in plant breeding]. , 1978 .

[17]  J. Mock,et al.  Recurrent Selection for Cold Tolerance in Maize , 1976 .

[18]  B Griffing,et al.  Concept of general and specific combining ability in relation to diallel crossing systems , 1956 .