Abstract
Abstract To sustain high production of alfalfa ( Medicago sativa ) with limited water resource in many areas, cultivars with improved water use efficiency (WUE) are urgently needed. We recently conducted greenhouse experiments and identified an alfalfa collection, River side (RS) that is naturized to the environment in the Grand River National Grassland in South Dakota, with a greater water use efficiency (WUE) under drought than other ten alfalfa accessions. To understand the mechanisms that may contribute to the higher WUE in RS, we examined physiological and morphological traits in comparison with Alfagraze (AF), a commercial variety with lower WUE under drought under greenhouse conditions. RS showed a greater reduction of water loss through transpiration despite more stomata per unit area under drought. Both RS and AF showed a reduction of stomatal aperture under drought compared to respective well‐watered plants but stomatal aperture in RS was smaller compared to AF regardless of irrigation status. Leaves of RS showed a more rapid accumulation of abscisic acid (ABA), at 14 days versus at 28 days in AF under drought. RS also closed stomata more rapidly when treated with 10 µM ABA. In addition, leaves of RS showed denser but shorter leaf hairs under drought. A correlation analysis points to a greater stomatal sensitivity to ABA in RS as a key factor contributing to its greater WUE under drought.
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Claims 10
Claim · model-written summary
Under drought, RS showed a greater reduction of water loss through transpiration than AF under greenhouse conditions.
- Taxon
- alfalfa
Medicago sativae0 - Material
- River side (RS)e1
- Treatment
- droughte3
- Outcome
- water loss through transpiratione3
- Direction
- greater reductione3
- Comparator
- Alfagraze (AF)e2
- Setting
- greenhouse conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“production of alfalfa ( Medicago sativa )”
e1“alfalfa collection, River side (RS)”
e2“in comparison with Alfagraze (AF), a commercial variety with lower WUE under drought under greenhouse conditions”
e3“RS showed a greater reduction of water loss through transpiration despite more stomata per unit area under drought”
Claim · model-written summary
RS had more stomata per unit area than AF under drought.
- Taxon
- alfalfaMedicago sativae0
- Material
- River side (RS)e1
- Treatment
- droughte3
- Outcome
- stomata per unit areae3
- Direction
- moree3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“production of alfalfa ( Medicago sativa )”
e1“alfalfa collection, River side (RS)”
e3“RS showed a greater reduction of water loss through transpiration despite more stomata per unit area under drought”
Claim · model-written summary
Both RS and AF reduced stomatal aperture under drought.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- droughte4
- Outcome
- stomatal aperturee4
- Direction
- reductione4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“production of alfalfa ( Medicago sativa )”
e4“Both RS and AF showed a reduction of stomatal aperture under drought”
Claim · model-written summary
Stomatal aperture in RS was smaller than in AF regardless of irrigation status.
- Taxon
- alfalfaMedicago sativae0
- Material
- RSe5
- Treatment
- irrigation statuse5
- Outcome
- stomatal aperturee5
- Direction
- smallere5
- Comparator
- AFe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“production of alfalfa ( Medicago sativa )”
e5“stomatal aperture in RS was smaller compared to AF regardless of irrigation status”
Claim · model-written summary
Leaves of RS accumulated abscisic acid more rapidly under drought, at 14 days versus 28 days in AF.
- Taxon
- alfalfaMedicago sativae0
- Material
- RSe6
- Organ / stage
- Leavese6
- Treatment
- droughte6
- Outcome
- accumulation of abscisic acid (ABA)e6
- Direction
- more rapide6
- Value
- 14 days versus at 28 dayse6
- Comparator
- AFe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“production of alfalfa ( Medicago sativa )”
e6“Leaves of RS showed a more rapid accumulation of abscisic acid (ABA), at 14 days versus at 28 days in AF under drought”
Claim · model-written summary
RS closed stomata more rapidly when treated with 10 µM ABA.
- Taxon
- alfalfaMedicago sativae0
- Material
- RSe7
- Treatment
- 10 µM ABAe7
- Outcome
- closed stomatae7
- Direction
- more rapidlye7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“production of alfalfa ( Medicago sativa )”
e7“RS also closed stomata more rapidly when treated with 10 µM ABA”
Claim · model-written summary
Leaves of RS had denser leaf hairs under drought.
- Taxon
- alfalfaMedicago sativae0
- Material
- RSe7
- Organ / stage
- leavese7
- Treatment
- droughte7
- Outcome
- leaf hairse7
- Direction
- densere7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“production of alfalfa ( Medicago sativa )”
e7“leaves of RS showed denser but shorter leaf hairs under drought”
Claim · model-written summary
Leaves of RS had shorter leaf hairs under drought.
- Taxon
- alfalfaMedicago sativae0
- Material
- RSe7
- Organ / stage
- leavese7
- Treatment
- droughte7
- Outcome
- leaf hairse7
- Direction
- shortere7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“production of alfalfa ( Medicago sativa )”
e7“leaves of RS showed denser but shorter leaf hairs under drought”
Claim · model-written summary
A correlation analysis points to greater stomatal sensitivity to ABA in RS as a key factor for its greater WUE under drought.
- Taxon
- alfalfaMedicago sativae0
- Material
- RSe7
- Treatment
- droughte7
- Outcome
- stomatal sensitivity to ABAe7
- Direction
- greatere7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“production of alfalfa ( Medicago sativa )”
e7“A correlation analysis points to a greater stomatal sensitivity to ABA in RS as a key factor contributing to its greater WUE under drought”
Claim · model-written summary
RS had greater WUE under drought than ten other alfalfa accessions.
- Taxon
- alfalfaMedicago sativae0
- Material
- River side (RS)e7
- Treatment
- droughte7
- Outcome
- water use efficiency (WUE)e7
- Direction
- greatere7
- Comparator
- other ten alfalfa accessionse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“production of alfalfa ( Medicago sativa )”
e7“an alfalfa collection, River side (RS) that is naturized to the environment in the Grand River National Grassland in South Dakota, with a greater water use efficiency (WUE) under drought than other ten alfalfa accessions”
The same questions in other papers
drought · physiology: gas exchange · Medicago sativa (alfalfa)Positive and negative results
2 papers in the same direction as this paper · 4 in the opposite direction
- negative
- negative
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3 papers more in this group
See all 7 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.