A new mechanism of transcription factors regulating lycopine metabolism and synthesis was elucidated

Steroidal alkaloids (SA) and their glycosylated forms (SGA) are a special class of metabolites widely present in nightshade and have a defensive effect against plant pathogens and herbivores. To date, nearly 100 steroidal alkaloids have been detected in tomatoes, of which α-tomatine (α-tomatine) is the most important SGA in the leaves, buds and fruits of nightshades. IN THE RIPENING PROCESS OF TOMATOES, TOXIC ALKALOIDS AND THEIR GLYCOSYLATION PRODUCTS ARE HYDROXYLATED, OXIDIZED AND TRANSAMIMONATED BY A SERIES OF GAMEs (glycoalkaloid metabolism) genes, and finally converted into non-toxic esculeoside a, which has been reported but the mechanism regulating sga biosynthesis is less studied.

Flowering tomato plants Courtesy of Hao Yingchen

On June 8, the team of Wang Shouchuang, Sanya Nanfan Research Institute/School of Tropical Crops, Hainan University, published a research paper in the international academic journal New Phytologist. Using forward genetics, this study identified an AP2/ERF transcription factor SlERF.H6 with genome-wide association analysis, which resolved its key role in regulating crosstalk signals between ethylene and gibberellin and thus regulating SGA biosynthesis. This study not only provides new ideas for analyzing the regulatory mechanism of SGA, but also lays a certain foundation for people to use a variety of technologies to cultivate excellent tomato varieties.

Changes in SGA content and GAMEs gene expression in SlERF.H6 transgenic materials

Hao Yingchen, a doctoral student at Hainan University, and Xiang Lijun, a master’s student, are co-first authors. Professor Wang Shouchuang and Associate Professor Yang Jun of Sanya Nanfan Research Institute/College of Tropical Crops, Hainan University are co-corresponding authors. This research was supported by the National Natural Science Foundation of China, the Key R&D Program of the Ministry of Science and Technology, the Young Talents Trusteeship Project of the China Association for Science and Technology, the Key R&D Project of Hainan Province, the Platform of Hainan Academician Innovation Center, and the High-level Talent Start-up Fund of Hainan University. (Source: Zhang Qingdan, China Science News)

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