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An Inheritance Study of Resistance to Maize Dwarf Mosaic Virus in Corn ( Zea mays L) 1
Author(s) -
Loesch P. J.,
Zuber M. S.
Publication year - 1967
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1967.00021962005900050013x
Subject(s) - biology , hybrid , diallel cross , zea mays , population , mendelian inheritance , agronomy , inbred strain , mosaic virus , plant virus , virus , genetics , gene , demography , sociology
The inheritance of host response to maize dwarf mosaic virus was studied under natural field conditions. Inbred lines 38‐11 (moderately resistant) and H55 (susceptible) and their F 1 , F 2 , BC 1 , and BC 2 progenies were evaluated at two testing sites. Numerous variables, including the possible confounding effect of the presence of additional viruses inciting stunting in corn, prevented a valid classical Mendelian analysis. Genetic ratios proved meaningless due to substantial variation in disease scores even in true‐breeding entries. However, resistance appeared to be partially dominant, and indirect evidence from other studies in Missouri indicate that (1) resistance is due to more than one gene, or (2) the host plants respond differentially to a heterogeneous virus population. Artificial inoculations of corn with pure isolates of maize dwarf mosaic virus are recommended for the determination of genetic ratios and gene numbers associated with resistance. But for experiments in the field in which the objectives are to determine the level of resistance and dominance relationships, diallel mating schemes employing F 1 hybrids are recommended.