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.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Drought tolerance selection increased maize grain yield by 86 kg ha −1 yr −1 on average.
- Treatment
- Selection for tolerance to midseason drought stresse0
- Outcome
- grain yieldse0
- Direction
- increasede0
- Value
- 86 kg ha −1 yr −1e0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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 ).”
t0“Maize”
Claim · model-written summary
Grain yield gains under severe N stress were nonsignificantly larger at 100 kg ha −1 yr −1.
- Treatment
- Selection for tolerance to midseason drought stresse0
- Outcome
- gains under severe N stresse0
- Direction
- largere0
- Value
- 100 kg ha −1 yr −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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 ).”
t0“Maize”
Claim · model-written summary
Drought tolerant selections had increased biomass at maturity, especially under severe N stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought‐tolerant selections had increased biomass and N accumulation at maturity, the changes being largest under severe N stress.”
t0“Maize”
Claim · model-written summary
Drought tolerant selections had increased N accumulation at maturity, especially under severe N stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought‐tolerant selections had increased biomass and N accumulation at maturity, the changes being largest under severe N stress.”
t0“Maize”
Claim · model-written summary
Drought tolerant selection cycles delayed maize leaf senescence.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought‐tolerant selection cycles were associated with delayed leaf senescence and an increased or unchanged N harvest index”
t0“Maize”
Claim · model-written summary
Drought tolerant selection cycles had increased or unchanged N harvest index.
- Material
- drought‐tolerant selection cyclese0
- Outcome
- N harvest indexe0
- Direction
- increased or unchangede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought‐tolerant selection cycles were associated with delayed leaf senescence and an increased or unchanged N harvest index”
t0“Maize”
The same questions in other papers
drought · yield · Zea mays (maize)Positive and negative results
52 papers in the same direction as this paper · 300 in the opposite direction
- negative
- negative
- negative
349 papers more in this group
See all 353 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.