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 Biological responses of Arabidopsis thaliana seedlings exposed to a microbial volatile 3-Methyl-1-butanol
Tác giả hoặc Nhóm tác giả: Truong Thi Tu Trinh, Chi-Chou Chiu, Pei-Yu Su, Ching-Han Chang, Tri-Phuong Nguyen, Jing-Yu Chen, Ruye-Hua Lee, Wan-Hsing Cheng, Hao-Jen HuangDepartment of Life Sciences, Institute of Tropical Plant Sciences and Microbiology, Graduate Program in Translational Agricultural Sciences, National Cheng Kung University, and Institute of Plant and Microbial Biology, Academia Sinica, Taiwan
Nơi đăng: 2ND Research Day _College of Bioscence and Biotechnology_National Cheng Kung University_Taiwan; Số: 2;Từ->đến trang: 1 page;Năm: 2022
Lĩnh vực: Kinh tế; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT

ABSTRACT
Microbial volatile compounds (mVCs) are in low molecular weight (100~500 Da) and with high vapor pressure, which allows them to diffuse easily in the air. Stomata are the central pores between a pair of guard cells in the leaf epidermis that play an essential role in the gas exchange of photosynthesis, transpiration, and also serve as a gateway for the entry of mVCs to the leaf interior. In human, indoor air pollutants can cause “sick building syndrome”, such as allergies, asthma, and headache. mVCs have been shown to induce stomatal closure however little is known about their mechanisms. Here, we investigated the toxic effects of secondary alcohol 3-methyl-1-butanol (3MB), one of the mVCs found in indoor air pollutants, on the growth of Arabidopsis thaliana after short-term exposure. We found that 1ppm of 3MB significantly reduced the stomatal aperture ratio within 48 hours. Also, 3MB dramatically enhance cytosolic pH level in guard cells about two times compared to untreated samples. The intracellular level of ROS in the guard cells significantly increased by approximately three-time after 3MB treatment. Moreover, ABA biosynthesis, cell wall integrity signaling, and MAP kinase cascades were all involved in 3MB volatile-induced stomatal closure. Intriguingly, the transcription of ethylene response factor 1 (ERF1), and ethylene and salt inducible 2 (ESE2) genes were upregulated (more than 1.5-fold) after 3MB exposure, which means 3MB volatile may induce the salinity tolerance through regulating ethylene response genes. Consistent to the data of gene expression above, 3MB remarkably enhanced the salinity stress tolerance in Arabidopsis through reduced cell death in the root tip. In conclusion, the results suggest that short-term exposure to 3MB volatile could provide a molecular strategy to reduce the risks of air pollution in the environment.Keywords: 3-methyl-1-butanol, air pollutants, microbial volatile compound, salt stress tolerance, stomatal closure.
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