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Associations Among Disease Resistance, Agronomic Characteristics, and Chemical Constituents in Flue‐Cured Tobacco 1
Author(s) -
Chaplin James F.
Publication year - 1970
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/agronj1970.00021962006200010028x
Subject(s) - tobacco mosaic virus , fusarium wilt , biology , plant disease resistance , hectare , horticulture , wilt disease , yield (engineering) , curing of tobacco , agronomy , veterinary medicine , virus , medicine , fusarium oxysporum , ecology , biochemistry , materials science , virology , gene , metallurgy , agriculture
Four hundred and sixty‐six F 5 breeding lines of fluecured tobacco were evaluated for associations among disease resistance, agronomic characteristics, and chemical constituents. These lines were derived from a cross between ‘NC 95’ and ‘MR Coker 139.’ Resistance to the following diseases were evaluated: tobacco mosaic virus (TMV), root‐knot, black shank, bacterial and fusarium wilt. Considerable yield decreases were associated with mosaic and fusarium wilt resistance. Yield decreases were greater when resistance to these two diseases was combined in the same line. Value per 45.4 kg was reduced slightly in all disease resistant lines when compared with susceptible ones. Further reductions in value per 45.4 kg were associated with lines resistant to more than one disease. Slight associations between resistance to some of the diseases and other characteristics such as percent sugars, total alkaloids, plant height, length and width of leaves were also noted. Narrow leaf type plants were associated with reduced yield and value per 45.4 kg. Black shank resistance was also associated with plant type, the narrow leaf types being slightly more resistant. Yield was highly correlated with value per hectare, value per 45.4 kg, width of leaves, days to flower, and percent sugars. Value per hectare was also correlated with value per 45.4 kg, width of leaves, height of plant, days to flower, and sugars. In addition, value per 45.4 kg was positively correlated with percent sugars.