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Transfer of Blue Mold Resistance into F 1 Tobacco Hybrids 1
Author(s) -
Dean C. E.,
Heggestad H. E.,
Grosso J. J.
Publication year - 1968
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1968.0011183x000800010028x
Subject(s) - hybrid , biology , nicotiana tabacum , blue mold , resistance (ecology) , seedling , horticulture , plant disease resistance , botany , genetics , gene , agronomy , postharvest , penicillium expansum
Seventeen F 1 hybrids resulting from crosses between tobacco ( Nicotiana tabacum L.) breeding lines and varieties having different levels of blue mold ( Peronospora tabacina Adam) resistance were evaluated. The parental lines were also evaluated to provide a basis for rating the hybrids. The resistance of the F 1 hybrids and parental lines was determined both at the seedling stage in greenhouses and at a more mature growth stage in the field. Seventy‐two percent of the F 1 hybrids were intermediate between the parental lines in terms of resistance classification. Those outside the parental limits were always slightly more susceptible rather than more resistant than the parents. Differences in the effectiveness of lines in imparting resistance in an F 1 hybrid were demonstrated. These differences were postulated to be caused by a more complementary genetic constitution containing modifiers which interact favorably with the major blue mold resistance genes. 'Dixie Shade' was a more desirable parent than was 2238. Blue mold resistance at an effective field level can be utilized in F 1 hybrids provided that careful selection of parental lines for resistance and other characteristics is practiced. Hybrids from crosses of resistant and susceptible parents should have a level of resistance sufficient for average field conditions.