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Correlations between Air Pollution Injury and Certain Agronomic, Chemical, and Physical Characteristics of Maryland Tobacco¹

ABSTRACT

Thirty-six Maryland tobacco (Nicotiana tabacum L.) entries including eight parent cultivars (‘Catterton,’ ‘Wilson,’ ‘Gertz,’ ‘Moore,’ ‘Maryland 59,’ ‘Maryland 10,’ ‘Maryland 64,’ and ‘Maryland 609’) and 28 hybrids (obtained by crossing the eight parent cultivars in all possible combinations including reciprocals) were grown at three locations with differing soil types in Maryland in 1972. The plants were scored for air pollution injury (weather fleck) at maturity.

Plants grown on deep sandy soils and showing drought stress symptoms exhibited less injury from air pollution than plants grown on sandy loam or silt loam soils. Correlations were made between weather fleck intensity and eleven agronomic, chemical, and physical characteristics of the tobacco. Reductions in yield, average price, and value of the cured tobacco were associated with increases in weather fleck intensity at two of the three locations. Also, taller plants and wider internode lengths were associated with increased fleck intensity at two of the three locations. Days to flower, filling capacity, and burn duration were associated with increased fleck intensity in a positive manner and total alkaloid contents in a negative manner at single locations only. Correlation values for either total nitrogen contents or leaves per plant with weather fleck intensity were nonsignificant at all locations.

Key Words: weather fleck • breeding • oxidant • ozone

¹ Sci. Article No. A2155, Contribution No. 5122 of the Maryland Agric. Exp. Stn., Dep. of Agronomy, College Park, MD 20742.

² Research Associate, Geneitcs Dep., Univ. of Wisconsin, Madison, WI 53706; Associate Professors of Agronomy, Univ. of Maryland, College Park, Md.

Received for publication October 9, 1975.