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Int. J. Mol. Sci. 2018, 19(4), 1194; https://doi.org/10.3390/ijms19041194

Separate and Combined Response to UV-B Radiation and Jasmonic Acid on Photosynthesis and Growth Characteristics of Scutellaria baicalensis

1
Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Northwest University, Xi’an 710069, China
2
College of Life and Geography Sciences, Kashgar University, Kashgar 844006, China
*
Author to whom correspondence should be addressed.
Received: 3 March 2018 / Revised: 7 April 2018 / Accepted: 10 April 2018 / Published: 13 April 2018
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Abstract

The negative effects of enhanced ultraviolet-B (UV-B) on plant growth and development have been reported with many species. Considering the ability of jasmonic acid (JA) to improve plant stress tolerance, the hypothesis that JA pretreatment could alleviate the adverse effects of UV-B on S. baicalensis was tested in this study with photosynthesis and growth characteristics. The results showed that UV-B or JA alone both induced photosynthesis inhibition and decreased biomass in stems and leaves. However, the photosynthetic reduction caused by increased UV-B was mainly related to the effect of nonstomatal-limitation, while that of JA was a stomatal-limitation effect. JA pretreatment prior to UV-B could remit the photosynthetic inhibition via the recovery of chlorophyll content, stomatal conductance; and intercellular CO2 concentration (especially the maximum electron transport rate increase). Furthermore, the coaction of JA and enhanced UV-B alleviated some disadvantageous effects on the leaf and did not aggravate the growth damage induced by their separate actions. View Full-Text
Keywords: UV-B; jasmonic acid; chlorophyll fluorescence; gas exchange; root system architecture UV-B; jasmonic acid; chlorophyll fluorescence; gas exchange; root system architecture
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Quan, J.; Song, S.; Abdulrashid, K.; Chai, Y.; Yue, M.; Liu, X. Separate and Combined Response to UV-B Radiation and Jasmonic Acid on Photosynthesis and Growth Characteristics of Scutellaria baicalensis. Int. J. Mol. Sci. 2018, 19, 1194.

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