AUTHOR=Sun Mengxi , Zhang Zhiqiang , Ren Zhongying , Wang Xingxing , Sun Wenjie , Feng Hongjie , Zhao Junjie , Zhang Fei , Li Wei , Ma Xiongfeng , Yang Daigang 

TITLE=The GhSWEET42 Glucose Transporter Participates in Verticillium dahliae Infection in Cotton

JOURNAL=Frontiers in Plant Science

VOLUME=12

YEAR=2021

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2021.690754

DOI=10.3389/fpls.2021.690754

ISSN=1664-462X

ABSTRACT=<p>The SWEET (sugars will eventually be exported transporter) proteins, a family of sugar transporters, mediate sugar diffusion across cell membranes. Pathogenic fungi can acquire sugars from plant cells to satisfy their nutritional demands for growth and infection by exploiting plant SWEET sugar transporters. However, the mechanism underlying the sugar allocation in cotton plants infected by <italic>Verticillium dahliae</italic>, the causative agent of <italic>Verticillium</italic> wilt, remains unclear. In this study, observations of the colonization of cotton roots by <italic>V. dahliae</italic> revealed that a large number of conidia had germinated at 48-hour post-inoculation (hpi) and massive hyphae had appeared at 96 hpi. The glucose content in the infected roots was significantly increased at 48 hpi. On the basis of an evolutionary analysis, an association analysis, and qRT-PCR assays, <italic>GhSWEET42</italic> was found to be closely associated with <italic>V. dahliae</italic> infection in cotton. Furthermore, <italic>GhSWEET42</italic> was shown to encode a glucose transporter localized to the plasma membrane. The overexpression of <italic>GhSWEET42</italic> in <italic>Arabidopsis thaliana</italic> plants led to increased glucose content, and compromised their resistance to <italic>V. dahliae</italic>. In contrast, knockdown of <italic>GhSWEET42</italic> expression in cotton plants by virus-induced gene silencing (VIGS) led to a decrease in glucose content, and enhanced their resistance to <italic>V. dahliae</italic>. Together, these results suggest that <italic>GhSWEET42</italic> plays a key role in <italic>V. dahliae</italic> infection in cotton through glucose translocation, and that manipulation of <italic>GhSWEET42</italic> expression to control the glucose level at the infected site is a useful method for inhibiting <italic>V. dahliae</italic> infection.</p>