New corn (Zea mays L.) hybrids grouping based on morphological traits, yield and its components

Document Type : Scientific - Research



Exiting diversity is the basis of selection in plant breeding programs. Diversity in morphological traits is studied by different methods of multivariate analysis. This study was conducted to estimate the genetical diversity of new corn hybrids based on the morphological traits. In this study, 40 new grain and forage corn hybrids with five commercial varieties as control treatments were planted in RCBD with three replications at Torogh Station of Khorasan Razavi Agriculture Research and Natural Resources Center, Iran during 2008. The results showed for the kernel yield and its components obtained three groups and two clusters with only one member. Furthermore, for forage yield and its components concluded five groups. Correlation coefficient between similarity matrix of forage and kernel yield cluster was very weak (0.15). Therefore,
selection for grain yield of corn hybrids cannot be used simultaneously for forage yield.


1- Blackith, R.E., and Mce Kevan, D.K. 1967. A study of the genus chrotogonus (Orthoptera). VIII. A study of variation in external morphology. Evolution 21: 76-84.
2- Bretting, P.K., Goodman, M.M., and Studer, C.W. 1990. Isozymatic variation in Guatemalan races of maize. American Journal of Botany 77: 211-225.
3- Camussi, A. 1979. Numerical taxonomy of Italian population of maize based on quantitative traits. Maydica 24: 161-174.
4- Choukan, R. 2006. Heterotic classification of corn line based on SCA with tester lines. Journal of Seed and Plant 22: 399-409. (In Persian with English Summary)
5- Choukan, R., Hosseinzade, E., Ghanadha, M.R., Talei, E., and Mohammadi, S.A. 2005. Corn lines clustering based on morphological traits. Journal of Seed and Plant 22: 399-409. (In Persian with English Summary)
6- Crossa, J., Basford, K., Taba, S., De Lacy, I., and Silva, E. 1995. Three mode analysis of maize using morphological and agronomic attributes measured in multilocation trials. Crop Science 35 1483-1491.
7- Doebley, J.I., Goodman, M.M. and Studer, C.W. 1985. Isozymatic variation in races of maize from Mexico. American Journal of Botany 72: 629-639.
8- Galarreta, J. I. R., and Alvarez, A. 2001. Morphological classification of maize landraces from Northern Spain. Gen. Resources and Crop Evolution 48: 391-400.
9- Goodman, M.M., and Paterniani, E. 1969. The races of maize. III. Choices of appropriate characters for racial classification. Economic Botany 23: 265-273.
10- Gouesnard, B., Dallard, Panouille, A. and Boyat, A. 1997. Classification of French maize populations based on morphological traits. Agronomic 17: 491-498.
11- Hallauer, A.R. and Miranda, J.B. 1988. Quantitative Genetics in Maize Breeding. 2nd ed. Iowa State University Press, Ames., Iowa.
12- Han, G.C., Vasal, S.K., Beck, D.L. and Elis, E. 1991. Combining ability of inbred lines derived from CIMMYT maize (Zea mays L.) germplasm. Maydica 36: 57-64.
13- Hussaini, S.H., Goodman, M.M., and Timoty, D.H. 1977. Multivariate analysis and the geographical distribution of the world collection of finger millet. Crop Science 17: 257-263.
14- Karimizade, R., Dehghani, H., and Dehghanpour, Z. 2006. Determination of corn hybrids stability by cluster analysis. Jornal of Agriculture and Natural Resources Science and Technology Iran 3(B): 337-347. (In Persian with English Summary)
15- Moghaddam, M., Mohammadi Shoti, M., and Aghaie Sarborzeh, M. 1995. Miultivariate Statistical Methods, A Primer. Pishtaz Elm publication. Tabriz, Iran. pp: 25-50. (In Persian)
16- Llaurado M., and Moreno-Gonzalez, J. 1993. Classification of northern Spanisn populations of maize by methods of numerical taxonomy. I. Morphological traits. Maydica 38: 15-21.
17- Sanchez, J.J., and Goodman, M. M. 1992. Relationships among Mexican and some north American and south American races of maize. Maydica 37: 41-51.
18- Smith, J.S.C., and Smith, O.S. 1989. The description and assessment of distance between inbred lines of maize: I. The use morphological traits as descriptors. Maydica 34: 141-150.
19- Smith, J.S.C., and Smith, O.S. 1992. Measurement of genetic diversity among maize hybrids: a comparison of isozymic, RFLP, pedigree, and heterosis data. Maydica 37: 53-60.