Abstract
Abstract Drought decreases plant production but the nutritional status of the plants may alter their susceptibility. Because Mg is a regulatory ion for several aspects of chloroplast photosynthesis, the effect of Mg nutrition on the grain yield of maize ( Zea mays L. cv. Dekalb XL43) subjected to a water deficit was examined during most of the grain‐filling period. Plants were grown at two soil Mg levels in a controlled environment capable of providing yields comparable to those in the field. The grain yield, shoot and root dry weight, leaf water potential (Ψ w ), and tissue mineral composition were determined. Immediately after tasseling, water was withheld from the soil of half the plants until the Ψ w had decreased to −1.8 to −2.0 MPa, where it remained until maturity. Low water potentials resulted in a 50% reduction in grain yield and an accelerated leaf senescence. Despite small but significant differences in Mg concentration in roots, stems, and leaves, no differences attributable to differences in Mg nutrition were found in rate of plant dehydration, dry matter accumulation, or grain yield. It is concluded that differences in Mg content of the plant either 1) do not influence response to low − or 2) must be larger than we achieved to see an effect.
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Claims 4
Claim · model-written summary
Low water potential reduced maize grain yield by 50%.
- Material
- Dekalb XL43e0
- Treatment
- Low water potentialse1
- Outcome
- grain yielde1
- Direction
- reductione1
- Value
- 50%e1
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of Mg nutrition on the grain yield of maize ( Zea mays L. cv. Dekalb XL43) subjected to a water deficit”
e1“Low water potentials resulted in a 50% reduction in grain yield and an accelerated leaf senescence”
Claim · model-written summary
Low water potential accelerated leaf senescence in maize.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of Mg nutrition on the grain yield of maize ( Zea mays L. cv. Dekalb XL43) subjected to a water deficit”
e1“Low water potentials resulted in a 50% reduction in grain yield and an accelerated leaf senescence”
Claim · model-written summary
Mg nutrition had no effect on plant dehydration rate, dry matter accumulation or grain yield under water deficit.
- Treatment
- differences in Mg nutritione2
- Outcome
- rate of plant dehydration, dry matter accumulation, or grain yielde2
- Direction
- no differencese2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of Mg nutrition on the grain yield of maize ( Zea mays L. cv. Dekalb XL43) subjected to a water deficit”
e2“no differences attributable to differences in Mg nutrition were found in rate of plant dehydration, dry matter accumulation, or grain yield”
Claim · model-written summary
Mg concentration differed significantly in roots, stems and leaves of maize.
- Organ / stage
- roots, stems, and leavese3
- Outcome
- Mg concentratione3
- Qualifier
- small but significant differencese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of Mg nutrition on the grain yield of maize ( Zea mays L. cv. Dekalb XL43) subjected to a water deficit”
e3“Despite small but significant differences in Mg concentration in roots, stems, and leaves”
The same questions in other papers
magnesium atom · yield · Zea mays (maize)Results differ
10 papers in the same direction as this paper · 36 in the opposite direction
- positive
- positive
- positive
43 papers more in this group
See all 47 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.