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- W2029062246 abstract "It is not known whether selection for improved tolerance to a specific abiotic stress leads to correlated changes in performance under other stresses. Drought and N deficiency are important constraints to production in the tropics. We examined the effect of selection for drought tolerance on performance of tropical maize ( Zea mays L.) under a range of N levels. Original and advanced selections of four populations, improved for tolerance to midseason drought for two to eight recurrent selection cycles each, were evaluated in two experiments under severe N stress, one experiment under medium N stress, and two well‐fertilized experiments. Nitrogen accumulated in the aboveground biomass at maturity averaged 52, 63, 105, 151, and 163 kg N ha −1 in the five experiments, and grain yields of 3.0, 2.9, 5.2, 6.0, and 6.5 Mg ha −1 were obtained. Selection for tolerance to midseason drought stress increased grain yields by an average of 86 kg ha −1 yr −1 with nonsignificantly larger gains under severe N stress (100 kg ha −1 yr −1 ). Drought‐tolerant selections had increased biomass and N accumulation at maturity, the changes being largest under severe N stress. Additionally, drought‐tolerant selection cycles were associated with delayed leaf senescence and an increased or unchanged N harvest index, indicating that leaf N was used more efficiently for grain production. Selection for tolerance to midseason drought stress appears to increase grain yield across a range of N stress levels and may lead to morphological and physiological changes that are of particular advantage under N stress." @default.
- W2029062246 created "2016-06-24" @default.
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- W2029062246 date "1999-07-01" @default.
- W2029062246 modified "2023-10-01" @default.
- W2029062246 title "Selection for Drought Tolerance Increases Maize Yields across a Range of Nitrogen Levels" @default.
- W2029062246 doi "https://doi.org/10.2135/cropsci1999.0011183x003900040012x" @default.
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