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Simultaneous Improvement of Downy Mildew Resistance and Agronomic Traits in Tropical Maize

Asian Regional Maize Program, P.O. Box 9-188, Bangkok, Thailand

R. N. Wedderburn and S. Pandey^*

Maize Program, CIMMYT, Apdo. Postal 6-641, 06600 México, D.F., Mexico
CIMMYT Maize Program, Aéreo 6713, Cali, Colombia

^* Corresponding author

Downy mildew (DM) of maize (Zea mays L.), caused by Peronosclerospora spp., is a problem in lowland tropics, particularly in South-east Asia. This study was conducted to measure progress from selection in DM resistance (DMR) and other agronomic traits in four broad-based tropical maize populations. Selection among and withjin S₁ and S₂ families was basd on responses in DM nurseries at Suwan, Thailand, and at the University of Southern Philippines Agricultural Research Center (USMARC), Philippines. Bulks of C0, C1, C2, and C3 of the four populations were evaluated for reaction of DM in disease nurseries and for agronomic traits under disease-free conditions at Suwan and USMARC. Correlations for DMR between Suwan and USMARC, based on C1-S₁ and C3-S₁ progenies of each population, were highly significant, positive in simultaneous and highly significant improvement of levels of DMR (-11.0% cycle^-1) and grain yield (507 kg cycle^-1) over the four populations.

Received for publication February 26, 1992.