Comparison of photosynthetic activity and heat tolerance between near isogenic lines of wheat with different photosynthetic rates

Wheat (Triticum aestivum L.) is one of the most important crops in the world, but the yield and quality of wheat are highly susceptible to heat stress, especially during the grain-filling stage. Therefore, it is crucial to select high-yield and high-temperature-resistant varieties for food cultivati...

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Bibliographic Details
Published in:PloS one 2021-12, Vol.16 (12), p.e0255896-e0255896
Main Authors: Li, Chongyang, Ma, Mingyang, Zhang, Tianpeng, Feng, Pengwen, Chen, Xiao, Liu, Yang, Brestic, Marian, Galal, Tarek M, Al-Yasi, Hatim M, Yang, Xinghong
Format: Article
Language:English
Subjects:
Agricultural production
Analysis
Antioxidants
Biology
Biology and Life Sciences
Calvin cycle
Chlorophyll
Comparative analysis
Enzymatic activity
Enzyme activity
Enzymes
Grain
Heat
Heat stress
Heat tolerance
Heat tolerance (Biology)
Heat-Shock Response
High temperature
Hsp70 protein
Humidity
Laboratories
Life sciences
Oxidative stress
Oxygen
Photosynthesis
Photosynthetic activity
Photosystem II
Physical Sciences
Physiology
Plant Proteins - genetics
Plant Proteins - metabolism
Proteins
Reactive oxygen species
Reactive Oxygen Species - metabolism
Species Specificity
Temperature tolerance
Thermotolerance
Triticum - genetics
Triticum - metabolism
Wheat
Yield
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Summary:Wheat (Triticum aestivum L.) is one of the most important crops in the world, but the yield and quality of wheat are highly susceptible to heat stress, especially during the grain-filling stage. Therefore, it is crucial to select high-yield and high-temperature-resistant varieties for food cultivation. There is a positive correlation between the yield and photosynthetic rate of wheat during the entire grain-filling stage, but few studies have shown that lines with high photosynthetic rates can maintain higher thermotolerance at the same time. In this study, two pairs of wheat near isogenic lines (NILs) with different photosynthetic rates were used for all experiments. Our results indicated that under heat stress, lines with a high photosynthetic rate could maintain the activities of photosystem II (PSII) and key Calvin cycle enzymes in addition to their higher photosynthetic rates. The protein levels of D1 and HSP70 were significantly increased in the highly photosynthetic lines, which contributed to maintaining high photosynthetic rates and ensuring the stability of the Calvin cycle under heat stress. Furthermore, we found that lines with a high photosynthetic rate could maintain high antioxidant enzyme activity to scavenge reactive oxygen species (ROS) and reduce ROS accumulation better than lines with a low photosynthetic rate under high-temperature stress. These findings suggest that lines with high photosynthetic rates can maintain a higher photosynthetic rate despite heat stress and are more thermotolerant than lines with low photosynthetic rates.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0255896