Agricultural and Biological Sciences
8 years ago

Reduced UV-B radiation boosts tobacco growth but harms photosynthesis efficiency.

Yingyong shengtai xuebao
[Responses of Nicotiana tabacum morphology and photosynthetic physiology to reduced ultraviolet-B radiation].
Zhong Chu, Yi Wang, Zong-yu Chen, Dong Zhuo-ya, Yan Kan, Shao-Fen Jian

Paper Summary

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Reducing UV-B radiation affects the growth and photosynthesis of tobacco plants. In this study, Nicotiana tabacum plants were exposed to different levels of reduced UV-B radiation. The plants grew taller with more space between leaves under less UV-B. However, their photosynthesis and water use efficiency decreased, especially with higher UV-B reduction. The main reason for lower photosynthesis was due to factors other than stomatal regulation. In the lowest UV-B treatment, photosynthesis improved, but pigment and flavonoid levels decreased. Overall, reducing UV-B radiation impacts tobacco plant growth and photosynthesis differently at different stages of maturity.