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Simultaneous Improvement of Downy Mildew Resistance and Agronomic Traits in Tropical Maize
Author(s) -
De leó C.,
Granados G.,
Wedderburn R. N.,
Pandey S.
Publication year - 1993
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1993.0011183x003300010018x
Subject(s) - downy mildew , biology , zea mays , tropics , agronomy , grain yield , poaceae , population , tropical agriculture , agriculture , yield (engineering) , veterinary medicine , ecology , materials science , demography , sociology , metallurgy , medicine
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 S 1 and S 2 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‐S 1 and C3‐S 1 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.