Abstract
Maize (Zea mays L.) productivity under drought stress depends to some extent upon a hybrid's capacity to produce and translocate assimilate to its developing kernels during the stress period and/or after the stress is relieved. The objective of this study was to evaluate differences in carbon and nitrogen accumulation and partitioning under drought stress among maize hybrids that differ in yield potential and/or physiological metabolism during reproductive development. The hybrids B73 × LH38, FS854, B73×Mol7 and US13 were subjected to drought stress from the 7th leaf stage until pollination was completed, at which time the soil of the stressed plots was replenished with water. For d. wt and chemical constituent determinations, plants of each hybrid were harvested from the irrigated and drought stressed plots at silking, mid-grain fill, and physiological maturity. Averaged over hybrids, vegetative biomass at silking was reduced 25% as a result of the drought stress treatment, with B73 × LH38 and FS854 accumulating more total biomass during the later portion of grain fill than the other two hybrids under both soil moisture treatments. At silking, the total non-structural carbohydrate content of the hybrids' vegetative tissue was not changed as a result of drought stress, whereas their reduced nitrogen (N) contents were decreased by an average of 33%. B73 × LH38 and FS854 had greater grain carbohydrate and reduced N contents under irrigation and smaller decreases in those variables as a result of soil moisture deficit than did the other two hybrids. These results indicate that the greater drought tolerance of B73 × LH38 and FS854 to stress imposed during vegetative and early reproductive development resulted from their more active N uptake and assimilation and sugar production during the later portion of grain fill and from their more efficient partitioning of assimilate to the developing kernels.
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Claims 8
Claim · model-written summary
Drought stress reduced vegetative biomass at silking by 25% in maize
- Organ / stage
- silkinge1
- Treatment
- drought stress treatmente1
- Outcome
- vegetative biomass at silkinge1
- Direction
- reducede1
- Value
- 25%e1
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) productivity under drought stress”
e1“vegetative biomass at silking was reduced 25% as a result of the drought stress treatment”
Claim · model-written summary
Drought stress did not change the total non-structural carbohydrate content of maize vegetative tissue at silking
- Organ / stage
- silkinge2
- Treatment
- drought stresse3
- Outcome
- total non-structural carbohydrate contente2
- Direction
- not changede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) productivity under drought stress”
e2“At silking, the total non-structural carbohydrate content”
e3“was not changed as a result of drought stress”
Claim · model-written summary
Drought stress decreased reduced nitrogen contents of maize vegetative tissue at silking by an average of 33%
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) productivity under drought stress”
e3“was not changed as a result of drought stress”
e4“their reduced nitrogen (N) contents were decreased by an average of 33%”
Claim · model-written summary
Hybrids B73 × LH38 and FS854 had greater grain carbohydrate and reduced N contents under irrigation
- Material
- B73 × LH38 and FS854e5
- Treatment
- under irrigatione5
- Outcome
- grain carbohydrate and reduced N contentse5
- Direction
- greatere5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) productivity under drought stress”
e5“B73 × LH38 and FS854 had greater grain carbohydrate and reduced N contents under irrigation and smaller decreases in those variables as a result of soil moisture deficit than did the other two hybrids”
Claim · model-written summary
Hybrids B73 × LH38 and FS854 showed smaller decreases in grain carbohydrate and reduced N contents under soil moisture deficit than the other two hybrids
- Material
- B73 × LH38 and FS854e5
- Treatment
- soil moisture deficite5
- Outcome
- decreases in those variablese5
- Direction
- smallere5
- Comparator
- the other two hybridse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) productivity under drought stress”
e5“B73 × LH38 and FS854 had greater grain carbohydrate and reduced N contents under irrigation and smaller decreases in those variables as a result of soil moisture deficit than did the other two hybrids”
Claim · model-written summary
Hybrids B73 × LH38 and FS854 accumulated more total biomass during the later portion of grain fill than the other two hybrids under both soil moisture treatments
- Material
- B73 × LH38 and FS854e6
- Treatment
- both soil moisture treatmentse6
- Outcome
- total biomass during the later portion of grain fille6
- Direction
- moree6
- Comparator
- the other two hybridse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) productivity under drought stress”
e6“B73 × LH38 and FS854 accumulating more total biomass during the later portion of grain fill than the other two hybrids under both soil moisture treatments”
Claim · model-written summary
Greater drought tolerance of hybrids B73 × LH38 and FS854 is attributed to more active N uptake and assimilation
- Material
- B73 × LH38 and FS854e7
- Outcome
- drought tolerancee7
- Qualifier
- more active N uptake and assimilatione7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) productivity under drought stress”
e7“These results indicate that the greater drought tolerance of B73 × LH38 and FS854 to stress imposed during vegetative and early reproductive development resulted from their more active N uptake and assimilation and sugar production during the later portion of grain fill and from their more efficient partitioning of assimilate to the developing kernels”
Claim · model-written summary
Greater drought tolerance of maize hybrids B73 × LH38 and FS854 is attributed to more efficient partitioning of assimilate to the developing kernels
- Outcome
- drought tolerancee7
- Qualifier
- more efficient partitioning of assimilate to the developing kernelse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize (Zea mays L.) productivity under drought stress”
e7“These results indicate that the greater drought tolerance of B73 × LH38 and FS854 to stress imposed during vegetative and early reproductive development resulted from their more active N uptake and assimilation and sugar production during the later portion of grain fill and from their more efficient partitioning of assimilate to the developing kernels”
The same questions in other papers
drought · quality: sugar starch · Zea mays (maize)Results differ
11 papers in the same direction as this paper
- negative
- negative
- no effect
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307 papers in the same direction as this paper · 77 in the opposite direction
- negative
- negative
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See all 385 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.