Abstract
Urban greenery is often affected by adverse environment (including inadequate water availabil-ity) of human agglomerations. Besides high aesthetic value, maples (Acer sp.) with elevated resistance to air/soil pollution, have become common components of ornamental plantations in Europe. Because of high theoretical (representativeness for species evaluation) and practical (planting age) relevancy, morphological and metabolic reactions of juvenile plants of eight maple species to one month long summer drought were studied in the experimental field to estimate the species drought resistance. In spite of marked growth differences, none from tested species showed a significant decrease in leaf relative water content indicating stress. However, in some of them activation of protective mechanisms was observed, what points to the past stress sensing. A. negundo with A. tataricum bet on transpiration area reduction (leaf shedding) and A. buergerianum, A. palmatum and A. saccharinum on osmotic adjustment (increased free proline concentration). Increase in stomatal index and/or reduction in specific leaf area, observed almost exclusively in species with continuous growth, had limited effect on the plant hydration status. Relative trunk growth was par-ticularly affected in the fast growing species. Taking into account the decisive protective mechanisms onset and trunk growth stability, species can be ordered in respect of drought resistance as follows: A. campestre, A. monspessulanum, A. platanoides, A. tataricum, A. negundo, A. saccharinum, A. palmatum and A. buergerianum.
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Claims 6
Claim · model-written summary
None of the tested maple species showed a significant decline in leaf relative water content under drought.
AcerNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“none from tested species showed a significant decrease in leaf relative water content indicating stress.”
t0“maples (Acer sp.)”
e1“reactions of juvenile plants of eight maple species to one month long summer drought”
Claim · model-written summary
A. negundo and A. tataricum shed leaves as a drought response.
- Taxon
- A. negundo
Acer negundoe0 - Outcome
- leaf sheddinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. negundo with A. tataricum bet on transpiration area reduction (leaf shedding)”
Claim · model-written summary
A. buergerianum, A. palmatum and A. saccharinum increased free proline concentration for osmotic adjustment.
- Taxon
- A. buergerianum
Acer buergerianume0 - Outcome
- free proline concentratione0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. buergerianum, A. palmatum and A. saccharinum on osmotic adjustment (increased free proline concentration).”
Claim · model-written summary
Stomatal index rose and/or specific leaf area fell mainly in continuously growing species, with limited hydration effect.
- Outcome
- stomatal indexe0
- Direction
- Increasee0
- Qualifier
- almost exclusively in species with continuous growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase in stomatal index and/or reduction in specific leaf area, observed almost exclusively in species with continuous growth, had limited effect on the plant hydration status.”
t0“maples (Acer sp.)”
Claim · model-written summary
Relative trunk growth was particularly affected in fast-growing maple species.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative trunk growth was par-ticularly affected in the fast growing species.”
t0“maples (Acer sp.)”
Claim · model-written summary
The authors ranked A. campestre most drought resistant and A. buergerianum least among eight species.
- Taxon
- A. campestre
Acer campestree0 - Outcome
- drought resistancee0
- Comparator
- A. buergerianume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“species can be ordered in respect of drought resistance as follows: A. campestre, A. monspessulanum, A. platanoides, A. tataricum, A. negundo, A. saccharinum, A. palmatum and A. buergerianum.”