Hybrid Performance of Selected Maize Lines from Reciprocal Recurrent and Testcross Selection Programs1
- W. A. Russell and
- S. A. Eberhart2
We evaluated three maize (Zea mays L.) crosses among BSCBI(R)C5, BSSS(R)C5, and BSSS(HT)C6 populations in six environments. BSCBI(R)C5 and BSSS(R)C5 improved populations from reciprocal recurrent selection, and BSSS(HT)C6 was obtained from testcross selection with a double-cross tester. Also, we used five selected S3 lines from each of BSCBI(R)C5 and BSSS(R)C5 and five selected S3 or S4 lines from BSSS(HT)C5 in three sets of line ✕ line crosses among the sources. Average yields of the population crosses were essentially equal, which was unexpected for BSSS(R)C5 ✕ BSSS(HT)C6 Most of the variation among crosses in each set was accounted for by average line performance (general combining ability) in all traits.
Average yield of line crosses in a set was significantly higher than the population cross in each set and in the BSCBI(R)C5 ✕ BSSS(R)C5 and BSCBI(R)C5 ✕ BSSS (HT)C6 sets, the best cross yielded 35% more than the population cross. Two BSCBI(R)C5 ✕ BSSS(R)C5 crosses yielded significantly higher than B37 ✕ Oh43, and one of these crosses was equal to B37 ✕ Oh43 for lodging resistance. None of the crosses in the other two sets was equal to B37 ✕ Oh45 for all traits, mainly because of lodging. A modified reciprocal recurrent selection procedure using an inbred tester is proposed as a more efficient method of simultaneously improving breeding populations and developing elite single crosses.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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