TY  - JA
AU  - Banziger,M.
AU  - Edmeades,G.O.
AU  - Lafitte, H.R.
TI  - Selection for drought tolerance increases maize yields across a range of nitrogen levels
SN  - 1435-0653
PY  - 1999///
CY  - USA
PB  - CSSA, Wiley
KW  - Maize
KW  - AGROVOC
KW  - Drought tolerance
KW  - Selection criteria
KW  - Nitrogen
KW  - Yields
N1  - Peer review; Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0011-183X
N2  - 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
UR  - https://hdl.handle.net/20.500.12665/895
T2  - Crop Science
DO  - https://doi.org/10.2135/cropsci1999.0011183X003900040012x
ER  -