Abstract
Plant growth regulating substances are involved in the physiological and metabolic processes of plants and enable them to cope with numerous environmental stresses. The effect of exogenously applied brassinolide (BR) with various concentrations (0.01, 0.1, and 1.0 mg L-1) was studied on morphological and physiological traits of Leymus chinensis (Trin.) Tzvelev under room and high temperatures in pots. The experimental results revealed that high temperature stress substantially perturbed growth, photosynthetic pigments, and root activity of L. chinensis; however, the deleterious effects of high temperature were partially ameliorated by the foliar application of BR. Compared to room temperature, high temperature stress decreased the plant height, leaf area, plant fresh and dry weight, chlorophyll a and b content, chlorophyll a/b ratio as well as root activity, while exacerbated the membrane damage as indicated by enhanced production of malondialdehyde (MDA). Accumulation of proline content, soluble protein and sugar content in L. chinensis improved by heat stress, compared with normal temperature; application of BR further improved their production thus aiding in the attainment of tolerance against heat stress. Elevated levels of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR) were observed under heat stress compared to room temperature, however, application of BR further proved beneficial in this regard. Our results indicated that BR could improve the growth and development of L. chinensis by enhancing the biosynthesis of photosynthetic pigments, osmolytes and antioxidant enzymes system in plants under both room and high temperature.
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Claims 9
Claim · model-written summary
High temperature decreased height, leaf area, fresh weight and dry weight.
- Taxon
- Leymus chinensisLeymus chinensist0
- Treatment
- high temperature stresse0
- Outcome
- plant height, leaf area, plant fresh and dry weighte0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“high temperature stress decreased the plant height, leaf area, plant fresh and dry weight”
t0“Leymus chinensis (Trin.) Tzvelev”
Claim · model-written summary
High temperature decreased chlorophyll a and b content and their ratio.
- Taxon
- Leymus chinensisLeymus chinensist0
- Treatment
- high temperature stresse0
- Outcome
- chlorophyll a and b content, chlorophyll a/b ratioe0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“high temperature stress decreased the plant height, leaf area, plant fresh and dry weight, chlorophyll a and b content, chlorophyll a/b ratio as well as root activity”
t0“Leymus chinensis (Trin.) Tzvelev”
Claim · model-written summary
High temperature decreased root activity.
- Taxon
- Leymus chinensisLeymus chinensist0
- Treatment
- high temperature stresse0
- Outcome
- root activitye0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“high temperature stress decreased the plant height, leaf area, plant fresh and dry weight, chlorophyll a and b content, chlorophyll a/b ratio as well as root activity”
t0“Leymus chinensis (Trin.) Tzvelev”
Claim · model-written summary
High temperature increased membrane damage and malondialdehyde production.
- Taxon
- Leymus chinensisLeymus chinensist0
- Outcome
- membrane damage as indicated by enhanced production of malondialdehyde (MDA)e0
- Direction
- enhancede0
Not reportedTreatmentComparator
Verbatim
e0“exacerbated the membrane damage as indicated by enhanced production of malondialdehyde (MDA)”
t0“Leymus chinensis (Trin.) Tzvelev”
Claim · model-written summary
Heat increased proline, soluble protein and sugar content.
Verbatim
e0“Accumulation of proline content, soluble protein and sugar content in L. chinensis improved by heat stress, compared with normal temperature”
Claim · model-written summary
Brassinolide further increased proline, soluble protein and sugar production under heat.
- Taxon
- L. chinensisLeymus chinensise1
- Treatment
- application of BRe0
- Outcome
- proline content, soluble protein and sugar contente1
- Direction
- improvede0
Not reportedComparator
Verbatim
e0“application of BR further improved their production thus aiding in the attainment of tolerance against heat stress”
e1“Accumulation of proline content, soluble protein and sugar content in L. chinensis improved by heat stress”
Claim · model-written summary
Heat increased five antioxidant enzyme levels.
Verbatim
e0“Elevated levels of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR) were observed under heat stress compared to room temperature”
t0“Leymus chinensis (Trin.) Tzvelev”
Claim · model-written summary
Brassinolide further enhanced antioxidant enzyme levels under heat.
- Taxon
- Leymus chinensisLeymus chinensist0
- Treatment
- application of BRe0
- Outcome
- levels of antioxidant enzymese1
Not reportedComparatorDirection
Verbatim
e0“application of BR further proved beneficial in this regard”
e1“Elevated levels of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR)”
t0“Leymus chinensis (Trin.) Tzvelev”
Claim · model-written summary
Brassinolide partly ameliorated heat effects on growth, pigments and root activity.
- Taxon
- L. chinensisLeymus chinensise1
- Treatment
- foliar application of BRe0
- Outcome
- growth, photosynthetic pigments, and root activitye1
- Direction
- amelioratede0
Not reportedComparator
Verbatim
e0“the deleterious effects of high temperature were partially ameliorated by the foliar application of BR”
e1“high temperature stress substantially perturbed growth, photosynthetic pigments, and root activity of L. chinensis”
The same questions in other papers
brassinolide · physiology: photosynthesis · Leymus chinensisResults agree
2 papers in the same direction as this paper
- positive
- positive
brassinolide · physiology: antioxidant enzymes · Leymus chinensisResults agree
3 papers in the same direction as this paper
- positive
- positive
- positive
brassinolide · physiology: osmolytes · Leymus chinensisResults agree
6 papers in the same direction as this paper
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →heat · growth · Leymus chinensisResults differ
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 papers →heat · physiology: pigments · Leymus chinensisResults agree
1 paper in the same direction as this paper
- negative
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.