Combining ability estimates for weather fleck in Nicotiana tabacum L

Journal Article · · Crop Sci.; (United States)

DOI:https://doi.org/10.2135/cropsci1972.0011183X001200050035x· OSTI ID:6597425

Aycock, Jr, M K

Seven cultivars of Nicotiana tabacum L. (four Maryland and three cigar types) and 21 F/sub 2/ hybrids were grown at three locations for 2 years. During August, data were collected on leaf damage caused by air pollutants, primarily ozone. This condition was referred to as weather fleck. Ozone causes small necrotic lesions usually 0.2 to 0.5 cm in diameter. Plants were scored on a scale of 1 to 5 (l = no damage, 5 = severe damage). Comparison of parent (2.34) and F/sub 1/ hybrid (2.37) performance indicated no significant amounts of heterotic resistance to weather fleck. Diallel analyses of variance of the F/sub 1/ hybrid generation suggested an appreciable amount of variance due to general combining ability (GCA) and the absence of variance due to specific combining ability (SCA). Genetic effects were stable with respect to locations and years. The genotype X environment interactions for the six environments were small. The predominance of additive genetic variance in this material suggests that progress could be made through selection.

• Research Organization: Univ. of Maryland, College Park
• OSTI ID: 6597425
• Journal Information: Crop Sci.; (United States), Journal Name: Crop Sci.; (United States) Vol. 12; ISSN CRPSA
• Country of Publication: United States
• Language: English

Related Subjects

500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AIR POLLUTION
BIOLOGICAL EFFECTS
BIOLOGICAL VARIABILITY
GENE RECOMBINATION
GENETIC EFFECTS
GENETIC VARIABILITY
LEAVES
NECROSIS
NICOTIANA
OZONE
PATHOLOGICAL CHANGES
PLANTS
POLLUTANTS
POLLUTION
SENSITIVITY