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a Pioneer Hi-Bred International, Inc., 7431 Kaumualii Highway, P.O. Box 596, Kekaha, HI 96752 USA
b CIMMYT, Apdo. Postal 6-641, 06600 Mexico D.F., Mexico
c CSIRO Tropical Agriculture, 306 Carmody Rd., St. Lucia, QLD 4067, Australia
d IRRI, P.O. Box 933, Manila, Philippines
edmeadgreg{at}hibred.com
Drought is common in tropical environments, and selection for drought tolerance is one way of reducing the impacts of water deficit on crop yield. The primary objective of this study was to evaluate biomass, grain yield, and harvest index of maize (Zea mays L.) populations selected for drought tolerance. Three late-maturing tropical maize populations were subjected to three cycles of S1 recurrent selection (`La Posta Sequía' and `Pool 26 Sequía') or eight cycles of full-sib recurrent selection (`Tuxpeño Sequía') for yield and traits indicative of drought tolerance during flowering and grain filling. Selection gains were assessed in five trials conducted under mid–late season drought and in five trials conducted under well-watered conditions. In water-stressed environments, with average yields of 1.0 to 4.5 Mg ha-1, yield gains averaged 0.26 Mg ha-1 (12.6%) cycle-1 for La Posta Sequía and Pool 26 Sequía and 0.08 Mg ha-1 (3.8%) cycle-1 for Tuxpeño Sequía. In well-watered conditions, where mean yields ranged from 5.8 to 10.4 Mg ha-1, corresponding gains per cycle were 0.12 Mg ha-1 (1.5%) and 0.04 Mg ha-1 (0.5%). Total biomass was unaffected by selection. Mean correlated responses to selection observed under drought were -0.11 Mg ha-1 cycle-1 in stem biomass and 0.025 cycle-1 in harvest index (HI), and under well-watered conditions, 0.005 cycle-1 in HI. Stem biomass and HI were negatively correlated under drought
. Improved drought tolerance was attributed to simultaneous selection in well-watered environments and under carefully managed water stress at flowering, resulting in greater partitioning of biomass to the ear and increased harvest index.
Abbreviations: AD, days from sowing to 50% anthesis • ASI, anthesis-silking interval • HI, harvest index • IS, intermediate stress • SS, severe stress • WW, well watered
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