Abstract
In the temperate soil, low rates of acetylene reduction activity were detected in excised roots of field grown maize without preincubation. A higher acetylene reduction activity (20 nmol C2H4/ g d.wt./ 24 h) was recorded under an atmosphere containing 5% oxygen than when the roots were incubated under 0% and 20% oxygen. Most probable number (MPN) counts of N2- fixing bacteria associated with field grown maize in the temperate soil were estimated at 7.0 x 106 cells/ g d:wt. roots. The acetylene reduction activity rhizosphere soil was very low (1.7 - 5.8 nmol C2H4/ 10 g d.wt. soil/ 24h) but higner than that recorded in soil sampled between the-maize., plarlt rows (0.8 - 2.8 nmol C2H~/ 10 g d.wt. soil/ 24 h). Soil amendment with glucose stimulated the nitrogenase activity threer hundred fold or more over a 72 h period. The reduction of acetylene to ethylene by intact maize plants grown in the temperate soil was immediate without significant lag periods. Higher rates of nitrogenase activity were observed in intact maize plants incubated under aerobic than under anaerobic conditions.
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Claims 7
Claim · model-written summary
Excised roots of field grown maize had low acetylene reduction activity in temperate soil.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize plants (zea mays l.)”
e1“low rates of acetylene reduction activity were detected in excised roots of field grown maize without preincubation”
Claim · model-written summary
Five percent oxygen yielded higher root acetylene reduction activity than zero or 20 percent oxygen.
- Organ / stage
- rootse2
- Treatment
- 5% oxygene2
- Outcome
- acetylene reduction activitye2
- Direction
- highere2
- Value
- 20 nmol C2H4/ g d.wt./ 24 he2
- Comparator
- 0% and 20% oxygene2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize plants (zea mays l.)”
e2“A higher acetylene reduction activity (20 nmol C2H4/ g d.wt./ 24 h) was recorded under an atmosphere containing 5% oxygen than when the roots were incubated under 0% and 20% oxygen.”
Claim · model-written summary
Root associated nitrogen fixing bacteria were estimated at 7.0 x 106 cells per gram dry weight of roots.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize plants (zea mays l.)”
e3“Most probable number (MPN) counts of N2- fixing bacteria associated with field grown maize in the temperate soil were estimated at 7.0 x 106 cells/ g d:wt. roots.”
Claim · model-written summary
Rhizosphere acetylene reduction activity exceeded interrow soil activity.
- Outcome
- acetylene reduction activity rhizosphere soile4
- Direction
- hignere4
- Value
- 1.7 - 5.8 nmol C2H4/ 10 g d.wt. soil/ 24he4
- Qualifier
- 0.8 - 2.8 nmol C2H~/ 10 g d.wt. soil/ 24 he4
- Comparator
- soil sampled between the-maize., plarlt rowse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize plants (zea mays l.)”
e4“The acetylene reduction activity rhizosphere soil was very low (1.7 - 5.8 nmol C2H4/ 10 g d.wt. soil/ 24h) but higner than that recorded in soil sampled between the-maize., plarlt rows (0.8 - 2.8 nmol C2H~/ 10 g d.wt. soil/ 24 h).”
Claim · model-written summary
Glucose amendment stimulated nitrogenase activity at least three hundredfold over 72 hours.
- Treatment
- Soil amendment with glucosee5
- Outcome
- nitrogenase activitye5
- Direction
- stimulatede5
- Value
- threer hundred fold or moree5
- Qualifier
- over a 72 h periode5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize plants (zea mays l.)”
e5“Soil amendment with glucose stimulated the nitrogenase activity threer hundred fold or more over a 72 h period.”
Claim · model-written summary
Intact maize plants immediately reduced acetylene to ethylene without significant lag.
- Organ / stage
- intact maize plantse6
- Outcome
- reduction of acetylene to ethylenee6
- Qualifier
- without significant lag periodse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize plants (zea mays l.)”
e6“The reduction of acetylene to ethylene by intact maize plants grown in the temperate soil was immediate without significant lag periods.”
Claim · model-written summary
Aerobic incubation gave higher nitrogenase activity in intact maize plants than anaerobic incubation.
- Treatment
- aerobice7
- Outcome
- rates of nitrogenase activitye7
- Direction
- Highere7
- Comparator
- anaerobic conditionse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“maize plants (zea mays l.)”
e7“Higher rates of nitrogenase activity were observed in intact maize plants incubated under aerobic than under anaerobic conditions.”
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See all 10 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.