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A comparison of five types of testers in evaluating the relationship of stalk rot resistance in corn inbred lines and stalk strength of the lines in hybrid combinations



A comparison of five types of testers in evaluating the relationship of stalk rot resistance in corn inbred lines and stalk strength of the lines in hybrid combinations



Crop Sci 1(6): 393-397



Stalk rot ratings were made on 35 inbred lines and their testcrosses with 5 different testers inbred B14 (highly resistant), inbred Os420 (susceptible), single cross WF9 x B14 (resistant), single cross C. I.187-2 x Os420 (susceptible), and double-double cross Ia 4570 x Ia 4810 (intermediate). The stalk rot was initiated by artificial inoculation with Diplodia zeae in the 1st elongated internode. Natural stalk breakage below the ear node was obtained for the testcrosses in a 2nd experiment. There were highly significant differences among lines and testcrosses for stalk rot resistance and among testcrosses for stalk breakage. The line x tester interaction was highly significant for stalk rot and stalk breakage. The susceptible testers gave the greatest range in stalk rot ratings and percent of broken stalks. The resistant testers were partially dominant and thus obscured some differences among lines. Correlations for stalk rot ratings of the lines and testcrosses were highly significant for all testers, but correlations for stalk rot ratings of the lines and stalk breakage of the testcrosses were lower and significant only for the resistant testers. Correlations of stalk rot ratings and stalk breakage values of the testcrosses were non-significant for all testers.

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