Abstract
Drought stress is a major environmental factor limiting plant growth. Selection of drought-tolerant plants is of critical importance in vegetation restoration and forestation programs. Alnus subcordata and Acer velutinum are two valuable, dominant, and endemic species in the Hyrcanian forests. There are fast-growing species and significant diffuse-porous hardwood in afforestation and reforestation. One-year old seedlings of both species were exposed to four water shortage treatments (100, 75, 50 and 25% of field capacity (FC) chosen as control, mild, moderate, and severe) for 12 weeks. Thereafter, their morphological characteristics such as height and basal area, total and organs biomass (root, stem, and leaf), leaf area (LA), specific leaf area (SLA), leaf area ratio (LAR), as well as physiological and biochemical characteristics such as relative water content (RWC), content of chlorophyll, free proline and malondialdehyde (MDA), and superoxide dismutase (SOD) and peroxidase (POD) activity were measured. The results showed that when exposed to reduced water availability, plants’ height, basal diameter, total and organs biomass, LA, LAR, RWC and chlorophyll content decreased, but their proline concentration, MDA content, SOD, and POD activity increased in both species. The root to shoot ratio (R/S) and root mass ratio (RMR) increased at 50 and 25% FC treatments in A. subcordata, whereas no significant difference was found in A. velutinum under drought treatments. SLA increased significantly at 50% FC in A. velutinum and decreased in A. subcordata under drought treatments compared to control treatment. A. velutinum showed more proline content, RWC, POD, and lower increase in MDA content than A. subcordata under moderate treatment. Therefore, A. velutinum appears to possess a better mechanism to cope drought stress. The drought tolerance of A. velutinum may enhance its potential for climatic adaptations under drier conditions with the ongoing climatic change.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 12
Claim · model-written summary
Reduced water availability decreased height, basal diameter and biomass in both species.
- Taxon
- both speciese0
- Treatment
- reduced water availabilitye0
- Outcome
- height, basal diameter, total and organs biomasse0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“when exposed to reduced water availability, plants’ height, basal diameter, total and organs biomass, LA, LAR, RWC and chlorophyll content decreased, but their proline concentration, MDA content, SOD, and POD activity increased in both species”
Claim · model-written summary
Reduced water availability decreased leaf area, leaf area ratio, and relative water content in both species.
Not reportedComparator
Verbatim
e0“when exposed to reduced water availability, plants’ height, basal diameter, total and organs biomass, LA, LAR, RWC and chlorophyll content decreased, but their proline concentration, MDA content, SOD, and POD activity increased in both species”
Claim · model-written summary
Reduced water availability decreased chlorophyll content in both species.
- Taxon
- both speciese0
- Treatment
- reduced water availabilitye0
- Outcome
- chlorophyll contente0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“when exposed to reduced water availability, plants’ height, basal diameter, total and organs biomass, LA, LAR, RWC and chlorophyll content decreased, but their proline concentration, MDA content, SOD, and POD activity increased in both species”
Claim · model-written summary
Reduced water availability increased proline and malondialdehyde in both species.
- Taxon
- both speciese0
- Treatment
- reduced water availabilitye0
- Outcome
- proline concentration, MDA contente0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“when exposed to reduced water availability, plants’ height, basal diameter, total and organs biomass, LA, LAR, RWC and chlorophyll content decreased, but their proline concentration, MDA content, SOD, and POD activity increased in both species”
Claim · model-written summary
Reduced water availability increased SOD and POD activity in both species.
- Taxon
- both speciese0
- Treatment
- reduced water availabilitye0
- Outcome
- SOD, and POD activitye0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“when exposed to reduced water availability, plants’ height, basal diameter, total and organs biomass, LA, LAR, RWC and chlorophyll content decreased, but their proline concentration, MDA content, SOD, and POD activity increased in both species”
Claim · model-written summary
Root to shoot and root mass ratios increased at 50 and 25% field capacity in Alnus subcordata.
- Taxon
- A. subcordata
Alnus subcordatae0 - Treatment
- 50 and 25% FC treatmentse0
- Outcome
- root to shoot ratio (R/S) and root mass ratio (RMR)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The root to shoot ratio (R/S) and root mass ratio (RMR) increased at 50 and 25% FC treatments in A. subcordata”
Claim · model-written summary
Those allocation ratios did not differ significantly under drought in Acer velutinum.
- Taxon
- A. velutinum
Acer velutinume0 - Treatment
- drought treatmentse0
- Outcome
- significant differencee0
- Direction
- noe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant difference was found in A. velutinum under drought treatments”
Claim · model-written summary
Specific leaf area increased significantly at 50% field capacity in Acer velutinum.
- Taxon
- A. velutinumAcer velutinume0
- Treatment
- 50% FCe0
- Outcome
- SLAe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SLA increased significantly at 50% FC in A. velutinum”
Claim · model-written summary
Specific leaf area decreased under drought in Alnus subcordata versus control.
- Taxon
- A. subcordataAlnus subcordatae0
- Treatment
- drought treatmentse0
- Outcome
- SLAe0
- Direction
- decreasede0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SLA increased significantly at 50% FC in A. velutinum and decreased in A. subcordata under drought treatments compared to control treatment”
Claim · model-written summary
Under moderate drought, Acer velutinum had more proline, RWC and POD than Alnus subcordata.
- Taxon
- A. velutinumAcer velutinume0
- Outcome
- proline content, RWC, PODe0
- Direction
- moree0
- Qualifier
- moderate treatmente0
- Comparator
- A. subcordatae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. velutinum showed more proline content, RWC, POD, and lower increase in MDA content than A. subcordata under moderate treatment”
Claim · model-written summary
Under moderate drought, Acer velutinum had a smaller MDA increase than Alnus subcordata.
- Taxon
- A. velutinumAcer velutinume0
- Outcome
- MDA contente0
- Direction
- lower increasee0
- Qualifier
- moderate treatmente0
- Comparator
- A. subcordatae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. velutinum showed more proline content, RWC, POD, and lower increase in MDA content than A. subcordata under moderate treatment”
Claim · model-written summary
Acer velutinum was interpreted as having greater drought coping capacity than Alnus subcordata.
- Taxon
- A. velutinumAcer velutinume0
- Outcome
- better mechanism to cope drought stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. velutinum appears to possess a better mechanism to cope drought stress”