Abstract
Introduction The mechanisms underlying adaptations of root system architecture (RSA) and root anatomy to phosphorus (P) deficiency and drought stress remain unclear in alfalfa ( Medicago sativa L.). This study investigated the root response strategies of two alfalfa cultivars (WL354HQ: WL354; Longdong: LD) with contrasting RSA under P deficiency and drought, and the relationship between root traits and shoot P uptake. Methods Root morphology and anatomy were assessed under varying P (0, 5, 20 mg P kg -1 soil) and water (80 ± 5% and 40 ± 5% field capacity) conditions using visual rhizoboxes, with two years field validation. Results Under low P and drought stress within the rhizoboxes, WL354 increased fine roots in soil layers below 60 cm, maintained xylem vessel area (XVA) in lateral roots below 90 cm, enlarged cortical cell size (CCS) in taproots and 2 nd lateral roots across several soil layers, and reduced cortical cell files (CCF) in both taproots and lateral roots throughout all soil layers. Conversely, LD merely maintained CCS in taproots and 2 nd lateral roots across several soil layers, and reduced CCF in taproots across all soil layers and in 1 st lateral roots above 90 cm. Simple linear correlation analysis revealed that shoot P uptake was positively correlated with total root surface area in the rhizobox experiment and with xylem vessel area of the taproot in the field experiment. Discussion Under P deficiency and drought, WL354 implemented a resource acquisition strategy by increasing resource capture and transport in deep soil, and uptake efficiency. In contrast, LD exhibited a relatively conservative strategy focused on uptake efficiency. An increase in total root surface area and xylem vessel area of the taproot may help promote shoot P uptake. These findings offer insight into root trait-based strategies for improving alfalfa productivity in low-P and drought regions.
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Claims 11
Claim · model-written summary
Under low P and drought stress in rhizoboxes, WL354 increased fine roots in soil layers below 60 cm.
- Taxon
- alfalfa
Medicago sativat0 - Material
- WL354e0
- Treatment
- low P and drought stresse0
- Outcome
- fine roots in soil layers below 60 cme0
- Direction
- increasede0
- Setting
- rhizoboxese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e0“Under low P and drought stress within the rhizoboxes, WL354 increased fine roots in soil layers below 60 cm”
Claim · model-written summary
Under low P and drought stress, WL354 maintained xylem vessel area in lateral roots below 90 cm.
- Taxon
- alfalfaMedicago sativat0
- Material
- WL354e0
- Treatment
- low P and drought stresse0
- Outcome
- xylem vessel area (XVA) in lateral roots below 90 cme1
- Direction
- maintainede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e0“Under low P and drought stress within the rhizoboxes, WL354”
e1“maintained xylem vessel area (XVA) in lateral roots below 90 cm”
Claim · model-written summary
Under low P and drought stress, WL354 enlarged cortical cell size in taproots and second lateral roots across several soil layers.
- Taxon
- alfalfaMedicago sativat0
- Material
- WL354e0
- Treatment
- low P and drought stresse0
- Outcome
- cortical cell size (CCS) in taproots and 2 nd lateral roots across several soil layerse1
- Direction
- enlargede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e0“Under low P and drought stress within the rhizoboxes, WL354”
e1“enlarged cortical cell size (CCS) in taproots and 2 nd lateral roots across several soil layers”
Claim · model-written summary
Under low P and drought stress, WL354 reduced cortical cell files in both taproots and lateral roots throughout all soil layers.
- Taxon
- alfalfaMedicago sativat0
- Material
- WL354e0
- Treatment
- low P and drought stresse0
- Outcome
- cortical cell files (CCF) in both taproots and lateral roots throughout all soil layerse1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e0“Under low P and drought stress within the rhizoboxes, WL354”
e1“reduced cortical cell files (CCF) in both taproots and lateral roots throughout all soil layers”
Claim · model-written summary
Under low P and drought stress, LD only maintained cortical cell size in taproots and second lateral roots across several soil layers.
- Taxon
- alfalfaMedicago sativat0
- Material
- LDe1
- Treatment
- low P and drought stresse0
- Outcome
- CCS in taproots and 2 nd lateral roots across several soil layerse1
- Direction
- maintainede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e0“Under low P and drought stress within the rhizoboxes”
e1“Conversely, LD merely maintained CCS in taproots and 2 nd lateral roots across several soil layers”
Claim · model-written summary
Under low P and drought stress, LD reduced cortical cell files in taproots across all soil layers and in first lateral roots above 90 cm.
- Taxon
- alfalfaMedicago sativat0
- Material
- LDe1
- Treatment
- low P and drought stresse0
- Outcome
- CCF in taproots across all soil layers and in 1 st lateral roots above 90 cme2
- Direction
- reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e0“Under low P and drought stress within the rhizoboxes”
e1“Conversely, LD”
e2“reduced CCF in taproots across all soil layers and in 1 st lateral roots above 90 cm”
Claim · model-written summary
Shoot P uptake was positively correlated with total root surface area in the rhizobox experiment.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- shoot P uptakee0
- Direction
- positively correlatede0
- Qualifier
- total root surface areae0
- Setting
- rhizobox experimente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e0“shoot P uptake was positively correlated with total root surface area in the rhizobox experiment”
Claim · model-written summary
Shoot P uptake was positively correlated with xylem vessel area of the taproot in the field experiment.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- shoot P uptakee0
- Direction
- positively correlatede0
- Qualifier
- xylem vessel area of the taproote0
- Setting
- field experimente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e0“shoot P uptake was positively correlated with total root surface area in the rhizobox experiment and with xylem vessel area of the taproot in the field experiment”
Claim · model-written summary
The authors interpret that under P deficiency and drought WL354 implemented a resource acquisition strategy by increasing resource capture and transport in deep soil and uptake efficiency.
- Taxon
- alfalfaMedicago sativat0
- Material
- WL354e0
- Treatment
- P deficiency and droughte0
- Outcome
- resource acquisition strategye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e0“Under P deficiency and drought, WL354 implemented a resource acquisition strategy by increasing resource capture and transport in deep soil, and uptake efficiency”
Claim · model-written summary
The authors interpret that under P deficiency and drought LD exhibited a relatively conservative strategy focused on uptake efficiency.
- Taxon
- alfalfaMedicago sativat0
- Material
- LDe1
- Treatment
- P deficiency and droughte0
- Outcome
- relatively conservative strategy focused on uptake efficiencye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e0“Under P deficiency and drought”
e1“In contrast, LD exhibited a relatively conservative strategy focused on uptake efficiency”
Claim · model-written summary
An increase in total root surface area and xylem vessel area of the taproot may help promote shoot P uptake.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- shoot P uptakee0
- Qualifier
- total root surface area and xylem vessel area of the taproote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e0“An increase in total root surface area and xylem vessel area of the taproot may help promote shoot P uptake”
The same questions in other papers
phosphorus · growth · Medicago sativa (alfalfa)Results differ
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- negative
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See all 72 papers →drought · cytology · Medicago sativa (alfalfa)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- no effect
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- positive
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.