Abstract
Soybean plants (Glycine max L. Merrill) that had reached full nodulation were submitted to physiological water stress by using polyethylene glycol (PEG 6000). Gibberellin A and/or abscisic acid were sprayed in an attempt to alleviate or mimic the stress. After rewatering the plants, endogenous growth inhibitors in the root system, nitrogenase activity (as per root or nodule basis), number of nodules per plant, and the fresh and dry weight of nodules and roots per plant and per treatment were investigated. Drought depressed both nodulation and nitrogenase activity and increased the levels of growth inhibitors in roots. However, ABA increased symbiotic N2 fixation activity in control plants growing in field capacity and also partially reversed the deleterious effects of drought. Gibberellin A had no action on control plants but annulled the effects of ABA. There was no correlation between the levels of growth inhibitors promoted by exogenous application of growth regulators and the nitrogenase activity and weight of nodules. Thus, the diminution in nodulation and the reductive capacity of the system is not due to inhibitors accumulated in roots by the effect of drought.
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Claims 7
Claim · model-written summary
Drought reduced soybean nodulation and nitrogenase activity.
- Taxon
- Soybean plants (Glycine max L. Merrill)
Glycine maxe0 - Treatment
- Droughte1
- Outcome
- nodulation and nitrogenase activitye1
- Direction
- depressede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean plants (Glycine max L. Merrill)”
e1“Drought depressed both nodulation and nitrogenase activity and increased the levels of growth inhibitors in roots.”
Claim · model-written summary
Drought raised root growth inhibitor levels.
- Taxon
- Soybean plants (Glycine max L. Merrill)Glycine maxe0
- Treatment
- Droughte1
- Outcome
- levels of growth inhibitors in rootse1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean plants (Glycine max L. Merrill)”
e1“Drought depressed both nodulation and nitrogenase activity and increased the levels of growth inhibitors in roots.”
Claim · model-written summary
ABA increased symbiotic nitrogen fixation in control plants.
- Taxon
- Soybean plants (Glycine max L. Merrill)Glycine maxe0
- Treatment
- ABAe1
- Outcome
- symbiotic N2 fixation activitye1
- Direction
- increasede1
- Comparator
- control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean plants (Glycine max L. Merrill)”
e1“ABA increased symbiotic N2 fixation activity in control plants growing in field capacity and also partially reversed the deleterious effects of drought.”
Claim · model-written summary
ABA partially reversed drought damage.
- Taxon
- Soybean plants (Glycine max L. Merrill)Glycine maxe0
- Treatment
- ABAe1
- Outcome
- deleterious effects of droughte1
- Direction
- partially reversede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean plants (Glycine max L. Merrill)”
e1“ABA increased symbiotic N2 fixation activity in control plants growing in field capacity and also partially reversed the deleterious effects of drought.”
Claim · model-written summary
Gibberellin A had no action on control plants.
- Taxon
- Soybean plants (Glycine max L. Merrill)Glycine maxe0
- Treatment
- Gibberellin Ae1
- Outcome
- action on control plantse1
- Direction
- no actione1
- Comparator
- control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean plants (Glycine max L. Merrill)”
e1“Gibberellin A had no action on control plants but annulled the effects of ABA.”
Claim · model-written summary
Gibberellin A annulled ABA effects.
- Taxon
- Soybean plants (Glycine max L. Merrill)Glycine maxe0
- Treatment
- Gibberellin Ae1
- Outcome
- effects of ABAe1
- Direction
- annullede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean plants (Glycine max L. Merrill)”
e1“Gibberellin A had no action on control plants but annulled the effects of ABA.”
Claim · model-written summary
Growth inhibitor levels did not correlate with nitrogenase activity or nodule weight.
- Taxon
- Soybean plants (Glycine max L. Merrill)Glycine maxe0
- Treatment
- exogenous application of growth regulatorse1
- Outcome
- nitrogenase activity and weight of nodulese1
- Direction
- no correlatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean plants (Glycine max L. Merrill)”
e1“There was no correlation between the levels of growth inhibitors promoted by exogenous application of growth regulators and the nitrogenase activity and weight of nodules.”
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