Abstract
In recent years, the increase of aerosol loading has resulted in obviously global dimming of solar light, which can adversely affect the growth and physiological properties of crops. In order to investigate the effects of reduced solar irradiance on photosynthsis, membrane lipid peroxidation and photosynthate accumulation characteristics of winter wheat cultivar, we conducted a field experiment in Nanjing area by using the Triticum aestivum L.(cv.Yang mai 13) as the experimental plants. Starting from jointing to maturity, the plants were subjected to 5 shading treatments, i.e.100%, 60%(T1), 40%(T2), 20%(T3) and 15%(T4) of total incident solar irradiation, with the first one as control(CK). Results indicated that 60%~15% of natural solar irradiance significantly restrained the net photosynthetic rate of winter wheat, which was decreased by 15.8%~70.1% of CK. However, the pigment contents(Chlorophyll a, Chlorophyll b and carotenoid) increased under the reduced solar irradiance treatments, and the increment of Chlorophyll b was more obviously. With decreasing intensity of solar irradiance was, significant reduction of membrane lipid peroxidation and cell membrane permeability was observed, and the lower the solar irradiance was, the stronger the impact was. When the solar irradiance decreased to 60%~15% of natural light, the contents of soluble sugar and soluble protein were respectively decreased by 32.22%~76.45% and 19.02%~48.12%, as compared to CK. However, under the same solar irradiance the total free amino acid increased by as much as 47.46%~177.87% of CK. In conclusion, reduced solar irradiance could significantly decrease the leaf photosynthesis of winter wheat, increase the contents of leaf photosynthetic pigments, restrain the membrane lipid peroxidation. As a result, the accumulation of sugar and protein was impaired, which would further influence the yield and nutritional quality of crops.
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Claims 6
Claim · model-written summary
Shading reduced winter wheat net photosynthetic rate by 15.8%~70.1% relative to control.
- Taxon
- winter wheat
Triticum aestivume0 - Treatment
- 60%~15% of natural solar irradiancee0
- Outcome
- net photosynthetic ratee0
- Direction
- decreasede0
- Value
- 15.8%~70.1%e0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“60%~15% of natural solar irradiance significantly restrained the net photosynthetic rate of winter wheat, which was decreased by 15.8%~70.1% of CK”
Claim · model-written summary
Reduced irradiance increased chlorophyll a, chlorophyll b and carotenoid contents, with a larger chlorophyll b increase.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- reduced solar irradiance treatmentse0
- Outcome
- pigment contents(Chlorophyll a, Chlorophyll b and carotenoid)e0
- Direction
- increasede0
- Qualifier
- increment of Chlorophyll b was more obviouslye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the pigment contents(Chlorophyll a, Chlorophyll b and carotenoid) increased under the reduced solar irradiance treatments, and the increment of Chlorophyll b was more obviously”
t0“Winter Wheat”
Claim · model-written summary
Lower irradiance reduced membrane lipid peroxidation and cell membrane permeability, more strongly at lower irradiance.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- decreasing intensity of solar irradiancee0
- Outcome
- membrane lipid peroxidation and cell membrane permeabilitye0
- Direction
- reductione0
- Qualifier
- the lower the solar irradiance was, the stronger the impact wase0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With decreasing intensity of solar irradiance was, significant reduction of membrane lipid peroxidation and cell membrane permeability was observed, and the lower the solar irradiance was, the stronger the impact was”
t0“Winter Wheat”
Claim · model-written summary
Reduced irradiance decreased soluble sugar content by 32.22%~76.45% versus CK.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- solar irradiance decreased to 60%~15% of natural lighte0
- Outcome
- soluble sugare0
- Direction
- decreasede0
- Value
- 32.22%~76.45%e0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the solar irradiance decreased to 60%~15% of natural light, the contents of soluble sugar and soluble protein were respectively decreased by 32.22%~76.45% and 19.02%~48.12%, as compared to CK”
t0“Winter Wheat”
Claim · model-written summary
Reduced irradiance decreased soluble protein content by 19.02%~48.12% versus CK.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- solar irradiance decreased to 60%~15% of natural lighte0
- Outcome
- soluble proteine0
- Direction
- decreasede0
- Value
- 19.02%~48.12%e0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the solar irradiance decreased to 60%~15% of natural light, the contents of soluble sugar and soluble protein were respectively decreased by 32.22%~76.45% and 19.02%~48.12%, as compared to CK”
t0“Winter Wheat”
Claim · model-written summary
Reduced irradiance increased total free amino acid by 47.46%~177.87% of CK.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- same solar irradiancee0
- Outcome
- total free amino acide0
- Direction
- increasede0
- Value
- 47.46%~177.87%e0
- Comparator
- CKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under the same solar irradiance the total free amino acid increased by as much as 47.46%~177.87% of CK”
t0“Winter Wheat”
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