Abstract
The effects of three concentrations (0.1, 0.01, 0.001 mg/kg) of exogenous 24-epibrassinolide on leaf photosynthesis, chlorophyll content, chlorophyll fluorescence, and parameters of light response curve in tomato seedlings under 150 micromol x m(-2) x s(-1) weak light stress were studied, with two tomato cultivars, 'Zhongza9', tolerant, and 'Zhongshu6', sensitive to weak light stress. The results showed that the net photosynthetic rate (Pn), maximal photochemical quantum efficiency of PSII (Fv/Fm), light saturation point (LSP), and dark respiration rate (Rd) decreased remarkably under weak light, but the chlorophyll content, especially chlorophyll b (chlb) content, increased obviously compared with normal light intensity control. However, exogenous 24-epibrassinolide alleviated the decrease of leaf Pn and Fv/Fm and induced the further increase of chlb content as well as the further decrease of Rd and chla/chlb under weak light stress, which indicated that exogenous 24-epibrassinolide could enhance plant tolerance to weak light and diminish damage from weak light. However, the optimum concentrations were different between the two cultivars; 0.1 mg/kg 24-epibrassinolide showed the best induction effects in 'Zhongshu6', and the best level for 'Zhongza9' was 0.01 mg/kg 24-epibrassinolide.
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Claims 9
Claim · model-written summary
Exogenous 24-epibrassinolide alleviated the weak-light decrease in leaf Pn and Fv/Fm in tomato seedlings.
- Taxon
- tomato
Solanum lycopersicume1 - Treatment
- exogenous 24-epibrassinolidee4
- Outcome
- leaf Pn and Fv/Fme4
- Direction
- alleviatede4
- Comparator
- weak light stresse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“with two tomato cultivars, 'Zhongza9', tolerant, and 'Zhongshu6', sensitive to weak light stress”
e4“exogenous 24-epibrassinolide alleviated the decrease of leaf Pn and Fv/Fm and induced the further increase of chlb content as well as the further decrease of Rd and chla/chlb under weak light stress”
Claim · model-written summary
Exogenous 24-epibrassinolide further increased chlorophyll b content under weak light.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- exogenous 24-epibrassinolidee4
- Outcome
- chlb contente4
- Direction
- further increasee4
- Comparator
- weak light stresse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“with two tomato cultivars, 'Zhongza9', tolerant, and 'Zhongshu6', sensitive to weak light stress”
e4“exogenous 24-epibrassinolide alleviated the decrease of leaf Pn and Fv/Fm and induced the further increase of chlb content as well as the further decrease of Rd and chla/chlb under weak light stress”
Claim · model-written summary
Exogenous 24-epibrassinolide further decreased Rd and the chla/chlb ratio under weak light.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- exogenous 24-epibrassinolidee4
- Outcome
- Rd and chla/chlbe4
- Direction
- further decreasee4
- Comparator
- weak light stresse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“with two tomato cultivars, 'Zhongza9', tolerant, and 'Zhongshu6', sensitive to weak light stress”
e4“exogenous 24-epibrassinolide alleviated the decrease of leaf Pn and Fv/Fm and induced the further increase of chlb content as well as the further decrease of Rd and chla/chlb under weak light stress”
Claim · model-written summary
Weak light decreased net photosynthetic rate, maximal PSII efficiency and light saturation point in tomato seedlings relative to normal light.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- weak lighte2
- Outcome
- net photosynthetic rate (Pn), maximal photochemical quantum efficiency of PSII (Fv/Fm), light saturation point (LSP)e2
- Direction
- decreasede2
- Comparator
- normal light intensity controle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“with two tomato cultivars, 'Zhongza9', tolerant, and 'Zhongshu6', sensitive to weak light stress”
e2“the net photosynthetic rate (Pn), maximal photochemical quantum efficiency of PSII (Fv/Fm), light saturation point (LSP), and dark respiration rate (Rd) decreased remarkably under weak light, but the chlorophyll content, especially chlorophyll b (chlb) content, increased obviously compared with normal light intensity control”
e3“compared with normal light intensity control”
Claim · model-written summary
Weak light decreased dark respiration rate in tomato seedlings relative to normal light.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- weak lighte2
- Outcome
- dark respiration rate (Rd)e2
- Direction
- decreasede2
- Comparator
- normal light intensity controle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“with two tomato cultivars, 'Zhongza9', tolerant, and 'Zhongshu6', sensitive to weak light stress”
e2“the net photosynthetic rate (Pn), maximal photochemical quantum efficiency of PSII (Fv/Fm), light saturation point (LSP), and dark respiration rate (Rd) decreased remarkably under weak light, but the chlorophyll content, especially chlorophyll b (chlb) content, increased obviously compared with normal light intensity control”
e3“compared with normal light intensity control”
Claim · model-written summary
Weak light increased chlorophyll content, especially chlorophyll b, in tomato seedlings relative to normal light.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- weak lighte2
- Outcome
- chlorophyll contente2
- Direction
- increasede2
- Comparator
- normal light intensity controle2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“with two tomato cultivars, 'Zhongza9', tolerant, and 'Zhongshu6', sensitive to weak light stress”
e2“the net photosynthetic rate (Pn), maximal photochemical quantum efficiency of PSII (Fv/Fm), light saturation point (LSP), and dark respiration rate (Rd) decreased remarkably under weak light, but the chlorophyll content, especially chlorophyll b (chlb) content, increased obviously compared with normal light intensity control”
Claim · model-written summary
Exogenous 24-epibrassinolide could enhance tomato tolerance to weak light and diminish weak-light damage.
- Taxon
- tomatoSolanum lycopersicume1
- Treatment
- exogenous 24-epibrassinolidee4
- Outcome
- plant tolerance to weak lighte4
- Direction
- enhancee4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“with two tomato cultivars, 'Zhongza9', tolerant, and 'Zhongshu6', sensitive to weak light stress”
e4“exogenous 24-epibrassinolide could enhance plant tolerance to weak light and diminish damage from weak light”
Claim · model-written summary
The 0.1 mg/kg 24-epibrassinolide level gave the best induction effects in Zhongshu6.
- Taxon
- tomatoSolanum lycopersicume1
- Material
- Zhongshu6e5
- Treatment
- 0.1 mg/kg 24-epibrassinolidee5
- Outcome
- induction effectse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“with two tomato cultivars, 'Zhongza9', tolerant, and 'Zhongshu6', sensitive to weak light stress”
e5“0.1 mg/kg 24-epibrassinolide showed the best induction effects in 'Zhongshu6'”
Claim · model-written summary
The 0.01 mg/kg 24-epibrassinolide level was the best level for Zhongza9.
- Taxon
- tomatoSolanum lycopersicume1
- Material
- Zhongza9e6
- Treatment
- 0.01 mg/kg 24-epibrassinolidee6
- Outcome
- best levele6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“with two tomato cultivars, 'Zhongza9', tolerant, and 'Zhongshu6', sensitive to weak light stress”
e6“the best level for 'Zhongza9' was 0.01 mg/kg 24-epibrassinolide”
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