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In this study, seven maize inbred lines representing different tropical,   drought tolerant populations and two adapted temperate maize inbred lines   were crossed in a half-diallel mating design to determine combining   abilities. The genotypes were tested in well-watered (WW) and managed water   stressed (WS) conditions in 2013 and 2014. General combining ability (GCA)   and specific combining ability (SCA) mean squares were significant for all   investigated traits and demonstrated both additive and non-additive genetic   effects in both conditions. Higher desired leaf rolling, leaf senescence,   stomatal conductance and leaf chlorophyll content GCA effects of tropical   inbreds under WS conditions showed the presence of the valuable allels   related to drought stress. SCA analysis revealed that the best hybrids for   water use efficiency and irrigation water use efficiency were tropical x   temperate crosses. Stress tolerance index and drought resistance index   identified G5 x G9, a tropical x temperate hybrid, as the most tolerant   hybrid to drought. Our study suggests that tropical drought tolerant   germplasm has the potential to contribute useful genetic diversity to   temperate maize breeding programs

Morpho-physiological combining ability among tropical and temperate maize germplasm for drought tolerance