Abstract
The negative impact of water stress on forest and tree plantation productivity has been the focus of many investigations. However, moderate water stress that can decrease productivity and is difficult to detect, has received less attention. Therefore, we designed a greenhouse experiment where the main objective was to test the efficacy of published biochemical and water stress indices along with physiological traits in detecting moderate water stress at leaf scale. Potted saplings of three hybrid poplars ((Populus × canadensis) × P. maximowiczii, Populus × canadensis and Populus × generosa ‘Boelare’) were subjected to moderate water stress. During the experiment we recorded (i) the biomass accumulation and allocation to leaves, stem, and roots; (ii) Net CO2 assimilation rate (A) and stomatal conductance (gs) and (iii) Spectral biochemical and water indices. Results indicate that moderate water deficit had a negative impact on biomass accumulation, but no change was detected in physiological traits. Nitrogen and chlorophyll contents also remained unaffected. Spectral biochemical indices failed to detect differences between treatments, whereas water stress indices succeeded. We also have identified unique wavelengths in the shortwave infrared region of the spectrum that proved sufficiently sensitive on their own to detect moderate water deficit. The results were not influenced by a genotype effect, suggesting that these unique wavelengths could be responding to a general rather than a species-specific leaf feature, thus widening opportunities for the early detection of plant stress, particularly moderate water deficit.
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Claims 7
Claim · model-written summary
Moderate water deficit had a negative impact on biomass accumulation in hybrid poplars.
- Treatment
- moderate water deficite1
- Outcome
- biomass accumulatione1
- Direction
- negative impacte1
- Setting
- greenhousee6
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potted saplings of three hybrid poplars”
e1“Results indicate that moderate water deficit had a negative impact on biomass accumulation”
e6“we designed a greenhouse experiment”
Claim · model-written summary
Moderate water deficit caused no change in physiological traits of hybrid poplars.
- Treatment
- moderate water deficite1
- Outcome
- physiological traitse7
- Direction
- no changee7
- Qualifier
- Net CO2 assimilation rate (A) and stomatal conductance (gs)e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potted saplings of three hybrid poplars”
e1“Results indicate that moderate water deficit had a negative impact on biomass accumulation”
e7“no change was detected in physiological traits”
e2“Net CO2 assimilation rate (A) and stomatal conductance (gs)”
Claim · model-written summary
Moderate water deficit did not change nitrogen and chlorophyll contents of hybrid poplars.
- Treatment
- moderate water deficite1
- Outcome
- Nitrogen and chlorophyll contentse2
- Direction
- remained unaffectede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potted saplings of three hybrid poplars”
e1“Results indicate that moderate water deficit had a negative impact on biomass accumulation”
e2“Nitrogen and chlorophyll contents also remained unaffected”
Claim · model-written summary
Spectral biochemical indices failed to detect differences between treatments in hybrid poplars.
- Outcome
- detect differences between treatmentse3
- Direction
- failed to detecte3
- Comparator
- water stress indicese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potted saplings of three hybrid poplars”
e3“Spectral biochemical indices failed to detect differences between treatments, whereas water stress indices succeeded”
Claim · model-written summary
Water stress indices succeeded in detecting differences between treatments in hybrid poplars, unlike spectral biochemical indices.
- Outcome
- detect differences between treatmentse3
- Direction
- succeedede3
- Comparator
- Spectral biochemical indicese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potted saplings of three hybrid poplars”
e3“Spectral biochemical indices failed to detect differences between treatments, whereas water stress indices succeeded”
Claim · model-written summary
Unique shortwave infrared wavelengths were sufficiently sensitive on their own to detect moderate water deficit in hybrid poplars.
- Treatment
- moderate water deficite4
- Outcome
- detect moderate water deficite4
- Value
- sufficiently sensitive on their owne4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potted saplings of three hybrid poplars”
e4“We also have identified unique wavelengths in the shortwave infrared region of the spectrum that proved sufficiently sensitive on their own to detect moderate water deficit”
Claim · model-written summary
The leaf spectral results of hybrid poplars were not influenced by a genotype effect.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potted saplings of three hybrid poplars”
e5“The results were not influenced by a genotype effect”
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