Abstract
Water deficit may occur at any stage of plant growth, with any intensity and duration. Phenotypic acclimation and the mechanism of adaptation vary with the evolutionary background of germplasm accessions and their stage of growth. Faba bean is considered sensitive to various kinds of drought. Hence, we conducted a greenhouse experiment in rhizotrons under contrasting watering regimes to explore shoot and root traits and drought avoidance mechanisms in young faba bean plants. Eight accessions were investigated for shoot and root morphological and physiological responses in two watering conditions with four replications. Pre-germinated seedlings were transplanted into rhizotron boxes filled with either air-dried or moist peat. The water-limited plants received 50-ml water at transplanting and another 50-ml water 4 days later, then no water was given until the end of the experimental period, 24 days after transplanting. The well-watered plants received 100 ml of water every 12 h throughout the experimental period. Root, stem, and leaf dry mass, their mass fractions, their dry matter contents, apparent specific root length and density, stomatal conductance, SPAD value, and Fv/Fm were recorded. Water deficit resulted in 3-4-fold reductions in shoot biomass, root biomass, and stomatal conductance along with 1.2-1.4-fold increases in leaf and stem dry matter content and SPAD values. Total dry mass and apparent root length density showed accession by treatment interactions. Accessions DS70622, DS11320, and ILB938/2 shared relatively high values of total dry mass and low values of stomatal conductance under water deficit but differed in root distribution parameters. In both treatments, DS70622 was characterized by finer roots that were distributed in both depth and width, whereas DS11320 and ILB938/2 produced less densely growing, thicker roots. French accession Mélodie/2 was susceptible to drought in the vegetative phase, in contrast to previous results from the flowering phase, showing the importance of timing of drought stress on the measured response. Syrian accession DS70622 explored the maximum root volume and maintained its dry matter production, with the difference from the other accessions being particularly large in the water-limited treatment, so it is a valuable source of traits for avoiding transient drought.
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Claims 8
Claim · model-written summary
Water deficit reduced shoot biomass, root biomass and stomatal conductance three to four fold.
- Taxon
- Faba bean
Vicia fabat0 - Treatment
- Water deficite0
- Outcome
- shoot biomass, root biomass, and stomatal conductancee0
- Direction
- reductionse0
- Value
- 3-4-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water deficit resulted in 3-4-fold reductions in shoot biomass, root biomass, and stomatal conductance”
t0“Faba Bean”
Claim · model-written summary
Water deficit increased leaf and stem dry matter content and SPAD values by 1.2 to 1.4 fold.
- Taxon
- Faba beanVicia fabat0
- Treatment
- Water deficite1
- Outcome
- leaf and stem dry matter content and SPAD valuese0
- Direction
- increasese0
- Value
- 1.2-1.4-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“1.2-1.4-fold increases in leaf and stem dry matter content and SPAD values”
e1“Water deficit resulted in”
t0“Faba Bean”
Claim · model-written summary
Total dry mass and apparent root length density showed accession by treatment interactions.
- Taxon
- Faba beanVicia fabat0
- Material
- accessione0
- Outcome
- Total dry mass and apparent root length densitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total dry mass and apparent root length density showed accession by treatment interactions”
t0“Faba Bean”
Claim · model-written summary
DS70622, DS11320 and ILB938/2 had relatively high total dry mass and low stomatal conductance under water deficit.
- Taxon
- Faba beanVicia fabat0
- Material
- DS70622, DS11320, and ILB938/2e0
- Treatment
- water deficite0
- Outcome
- total dry mass and low values of stomatal conductancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accessions DS70622, DS11320, and ILB938/2 shared relatively high values of total dry mass and low values of stomatal conductance under water deficit”
t0“Faba Bean”
Claim · model-written summary
DS70622 had finer roots distributed in depth and width in both treatments.
- Taxon
- Faba beanVicia fabat0
- Material
- DS70622e0
- Outcome
- finer roots that were distributed in both depth and widthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both treatments, DS70622 was characterized by finer roots that were distributed in both depth and width”
t0“Faba Bean”
Claim · model-written summary
DS11320 and ILB938/2 produced less densely growing, thicker roots.
- Taxon
- Faba beanVicia fabat0
- Material
- DS11320 and ILB938/2e0
- Outcome
- less densely growing, thicker rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DS11320 and ILB938/2 produced less densely growing, thicker roots”
t0“Faba Bean”
Claim · model-written summary
Mélodie/2 was susceptible to drought in the vegetative phase.
- Taxon
- Faba beanVicia fabat0
- Material
- Mélodie/2e0
- Organ / stage
- vegetative phasee0
- Outcome
- susceptible to droughte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“French accession Mélodie/2 was susceptible to drought in the vegetative phase”
t0“Faba Bean”
Claim · model-written summary
DS70622 explored maximum root volume and maintained dry matter production, especially under water limitation.
- Taxon
- Faba beanVicia fabat0
- Material
- DS70622e0
- Treatment
- water-limited treatmente0
- Outcome
- maximum root volume and maintained its dry matter productione0
- Comparator
- other accessionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Syrian accession DS70622 explored the maximum root volume and maintained its dry matter production, with the difference from the other accessions being particularly large in the water-limited treatment”
t0“Faba Bean”
The same questions in other papers
drought · physiology: gas exchange · Vicia faba (faba bean)Results agree
5 papers in the same direction as this paper
- negative
- negative
- no effect
2 papers more in this group
See all 6 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.