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Published in Crop Sci 23:1085-1087 (1983)
© 1983 Crop Science Society of America
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Inheritance of Resistance to Infection by Drechslera Sorokiniana in Tall Fescue1

S. D. Linscombe, C. E. Watson, Jr. and L. E. Trevathan2

Drechslera sorokiniana (Sacc.) Subram. & Jain (= Helminthosporium sativum P.B.&K.) is a major pathogen of tall fescue (Festuca arundinacea Schreb.). Damage to infected plants can vary from a small number of minute spots on the leaves to extensive coalescing lesions which can eventually kill highly susceptible plants. The objectives of this study were to examine the inheritance of resistance to infection by D. sorokiniana in tall fescue and to determine the effects of selection for resistance using a greenhouse inoculation technique. In Exp. 1, a five parent (Diallel I) and a six parent diallel cross (Diallel II) were evaluated for resistance to infection by D. sorokiniana. Variation for general combining ability was significant for lesion coverage and lesion size in both diallel crosses. Specific combining ability variation was not significant. In most cases, highly resistant x highly resistant crosses had high levels of resistance, highly susceptible x highly susceptible crosses had low levels of resistance and highly resistant x highly susceptible crosses had intermediate levels of resistance. In Exp. 2 ‘Alta’, ‘Kentucky 31’, MSF-72-1, and Oregon 1000 tall fescue were subjected to a single cycle of mass selection for resistance to infection by D. sorokiniana. Resistance as measured by lesion coverage and lesion size was significantly increased in all populations. Heritability values ranged from 0.62 (Alta) to 0.78 (Oregon 1000) for lesion coverage from 0.38 (Alta) to 0.69 (Oregon 1000) for lesion size. Results from both experiments suggest that additive gene action is of major importance in the control of resistance to infection by D. sorokiniana. Mass selection is an efficient means of improving the level of resistance.

Key Words: Festuca arundinacea Schreb. • Combining ability • Disease resistance • Heritability • Helminthosporium sativum

1 Contribution of the Mississippi Agricultural and Forestry Exp. St., Mississippi State, MS 39762. Journal Paper no. 5261.

2 Former graduate research assistant (currently assistant specialist, Cooperative Extension Service, Louisiana State Univ., Baton Rouge, LA 70803) and associate professor of agronomy, Agronomy Dep., and associate professor of plant pathology, Dep. of Plant Pathology and Weed Science, Mississippi State Univ., Mississippi State, MS 39762, respectively.

Received for publication September 28, 1982.




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