Abstract
Abstract There is generally a trade‐off in the resistance to drought and to waterlogging. However, several species are sequentially subjected to both stressors in many environments. We evaluated the ecophysiological strategies to cope with multiple sequential stress of waterlogging and drought (W + D) of three taxa differing in stress resistance and root morphology: the phreatophic Eucalyptus camaldulensis (Ec) and two shallow‐rooted willow clones: Salix matsudana x Salix alba (SmxSa) and Salix nigra (Sn4). Individuals of the three taxa were grown in pots and assigned to either of four treatments: Control (well‐watered plants), well‐watered followed by drought (C + D); waterlogged for 15 days followed by drought (W15d + D) and waterlogged for 30 days followed by drought (W30d + D). Biomass allocation, growth (diameter, height, length of leaves, and roots), specific leaf area, stomatal conductance, water potential, hydraulic conductivity of roots and branches, leaf C 13 and root cortical aerenchyma formation were determined at different stages of the experiment. Ec growth was not affected by W + D, developing tolerance strategies at leaf and whole plant levels. Differential effects of W + D were observed in both Salix clones depending on the time of waterlogging. In Sn4 and SmxSa, the root biomass was affected in W15d + D treatment, but a root tolerance response (aerenchyma and adventitious root formation) was observed in W30d + D. In the three taxa, and contrary to expectations, the previous exposure to a waterlogging period did not increase the susceptibility of the plants to a subsequent drought event. On the contrary, we found tolerance, which depended on the time of waterlogging exposure.
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Claims 8
Claim · model-written summary
Eucalyptus camaldulensis growth was unaffected by sequential waterlogging and drought.
- Taxon
- Eucalyptus camaldulensis
Eucalyptus camaldulensise3 - Treatment
- W + De0
- Outcome
- growthe0
- Direction
- not affectede0
- Comparator
- Controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ec growth was not affected by W + D, developing tolerance strategies at leaf and whole plant levels.”
t0“three woody taxa”
e2“Control (well‐watered plants)”
e3“Eucalyptus camaldulensis”
Claim · model-written summary
Eucalyptus developed tolerance strategies at leaf and whole plant levels.
- Taxon
- Eucalyptus camaldulensisEucalyptus camaldulensise3
- Outcome
- tolerance strategies at leaf and whole plant levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ec growth was not affected by W + D, developing tolerance strategies at leaf and whole plant levels.”
t0“three woody taxa”
e3“Eucalyptus camaldulensis”
Claim · model-written summary
Salix nigra root biomass was affected by 15 days waterlogging followed by drought.
- Taxon
- Salix nigra
Salix nigrae3 - Treatment
- W15d + De0
- Outcome
- root biomasse0
- Comparator
- Controle2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Sn4 and SmxSa, the root biomass was affected in W15d + D treatment”
t0“three woody taxa”
e2“Control (well‐watered plants)”
e3“Salix nigra”
Claim · model-written summary
Salix matsudana x Salix alba root biomass was affected by 15 days waterlogging followed by drought.
- Taxon
- Salix matsudana x Salix alba
Salix matsudanae3 - Treatment
- W15d + De0
- Outcome
- root biomasse0
- Comparator
- Controle2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In Sn4 and SmxSa, the root biomass was affected in W15d + D treatment”
t0“three woody taxa”
e2“Control (well‐watered plants)”
e3“Salix matsudana x Salix alba”
Claim · model-written summary
Salix nigra formed aerenchyma and adventitious roots after 30 days waterlogging followed by drought.
- Taxon
- Salix nigraSalix nigrae3
- Treatment
- W30d + De0
- Outcome
- aerenchyma and adventitious root formatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a root tolerance response (aerenchyma and adventitious root formation) was observed in W30d + D.”
t0“three woody taxa”
e3“Salix nigra”
Claim · model-written summary
Salix matsudana x Salix alba formed aerenchyma and adventitious roots after 30 days waterlogging followed by drought.
- Taxon
- Salix matsudana x Salix albaSalix matsudanae3
- Treatment
- W30d + De0
- Outcome
- aerenchyma and adventitious root formatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a root tolerance response (aerenchyma and adventitious root formation) was observed in W30d + D.”
t0“three woody taxa”
e3“Salix matsudana x Salix alba”
Claim · model-written summary
Prior waterlogging did not increase subsequent drought susceptibility in all three taxa.
Verbatim
e0“In the three taxa, and contrary to expectations, the previous exposure to a waterlogging period did not increase the susceptibility of the plants to a subsequent drought event.”
t0“three woody taxa”
e2“Control (well‐watered plants)”
Claim · model-written summary
Tolerance depended on waterlogging duration.
Not reportedDirection
Verbatim
e0“we found tolerance, which depended on the time of waterlogging exposure.”
t0“three woody taxa”