Abstract
Alfalfa field was established to investigate seasonal changes of nodule activity and contents of carbohydrates, and nitrogen, and also to examine their relationships in alfalfa (Medicago sativa L.). Periodical sampling of alfalfa in cutting and uncutting plots was collected to measure growth of plants, development and activity of nodule, and content of carbohydrates and nitrogen in the third year following year of establishment. Nodule activity of alfalfa root appeared to early April, increased to a maximum in beginning of June (flowering stage), and then decreased and generally remained low from late-July to mid-August, and again increased from early September, and then decreased and generally remained low for the rest of growing season. After flowering, nodule weight tended to decrease slowly throughout the growing season. Until flowering stage, increase of dry weight was closely related with that of nodule activity. But after flowering the curve pattern of dry weight did not fit to that of nodule activity due to decrease of supply of assimilate to nodule, drought, and high temperature. Total nonstructural carbohydrates in roots were closely correlated with nodule weight and nodule activity. While, nitrogen contents in leaves were closely correlated with nodule weight and nodule activity. Also cutting on July prevented unnessesary losses of respiration during summer to provide rapid recovery of nodule activity
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Claims 9
Claim · model-written summary
Alfalfa root nodule activity appeared in early April, peaked in early June, declined later, rose in September and declined again.
- Taxon
- alfalfa
Medicago sativae0 - Organ / stage
- roote0
- Outcome
- Nodule activitye0
- Qualifier
- beginning of June (flowering stage)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodule activity of alfalfa root appeared to early April, increased to a maximum in beginning of June (flowering stage), and then decreased and generally remained low from late-July to mid-August, and again increased from early September, and then decreased and generally remained low for the rest of growing season.”
Claim · model-written summary
Nodule weight slowly decreased after flowering through the growing season.
- Taxon
- AlfalfaMedicago sativat0
- Outcome
- nodule weighte0
- Direction
- decreasee0
- Qualifier
- After floweringe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After flowering, nodule weight tended to decrease slowly throughout the growing season.”
t0“Alfalfa”
Claim · model-written summary
Before flowering, dry weight increase closely tracked increased nodule activity.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- flowering stagee0
- Outcome
- dry weighte0
- Direction
- increasee0
- Qualifier
- closely related with that of nodule activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Until flowering stage, increase of dry weight was closely related with that of nodule activity.”
t0“Alfalfa”
Claim · model-written summary
After flowering, dry weight no longer followed nodule activity.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- floweringe0
- Outcome
- curve pattern of dry weighte0
- Qualifier
- did not fit to that of nodule activitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“But after flowering the curve pattern of dry weight did not fit to that of nodule activity due to decrease of supply of assimilate to nodule, drought, and high temperature.”
t0“Alfalfa”
Claim · model-written summary
Reduced assimilate supply, drought and high temperature were proposed to explain the post-flowering mismatch.
- Taxon
- AlfalfaMedicago sativat0
- Outcome
- decrease of supply of assimilate to nodulee0
- Qualifier
- drought, and high temperaturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“due to decrease of supply of assimilate to nodule, drought, and high temperature.”
t0“Alfalfa”
Claim · model-written summary
Root total nonstructural carbohydrates closely correlated with nodule weight.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- rootse0
- Outcome
- nodule weighte0
- Qualifier
- closely correlated with nodule weighte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total nonstructural carbohydrates in roots were closely correlated with nodule weight and nodule activity.”
t0“Alfalfa”
Claim · model-written summary
Root total nonstructural carbohydrates closely correlated with nodule activity.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- rootse0
- Outcome
- nodule activitye0
- Qualifier
- Total nonstructural carbohydratese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total nonstructural carbohydrates in roots were closely correlated with nodule weight and nodule activity.”
t0“Alfalfa”
Claim · model-written summary
Leaf nitrogen content closely correlated with nodule weight and activity.
- Taxon
- AlfalfaMedicago sativat0
- Organ / stage
- leavese0
- Outcome
- nodule weight and nodule activitye0
- Qualifier
- nitrogen contentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen contents in leaves were closely correlated with nodule weight and nodule activity.”
t0“Alfalfa”
Claim · model-written summary
July cutting prevented summer respiration losses and supported rapid nodule activity recovery.
- Taxon
- AlfalfaMedicago sativat0
- Treatment
- cutting on Julye0
- Outcome
- losses of respiratione0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cutting on July prevented unnessesary losses of respiration during summer to provide rapid recovery of nodule activity”
t0“Alfalfa”