Stability and adaption responses of maize variety hybrids developed by recurrent selection for grain yield

Fakorede, M.A.B.; Mock, J.J.

Maydica 23(2): 89-100


ISSN/ISBN: 0025-6153
Accession: 000752803

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Seven cycles of reciprocal recurrent selection for improved grain yield were carried out in Iowa Stiff Stalk Synthetic (BSSS) and Iowa Corn Borer Synthetic 1 (BSCB1) and six cycles of half-sib selection in the open-pollinated variety Alph (BS12). Evaluation of yield stability of improved and unimproved hybrids from these programmes at two sites (one for two years) differing in nitrogen level and plant density was undertaken. All the hybrids were stable in the environments evaluated but differences between the hybrids existed in adaptation to the environments. Both BSSS(R)C7 X BSCB1(R)C7 and BS12C6 X B14A were adapted to high levels of nitrogen while BSSS(R)C0 X BSCB1(R)C0 was adapted to low levels of nitrogen. Both BSSS(R)C5 X BSCB1(R)C5 and BSSS(R)C7 X BSCB1(R)C7 were more adapted to high than to low plant densities.