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The brassinosteroid signaling component slbzr1 promotes tomato fruit ripening and carotenoid accumulation

Journal of Integrative Plant Biology 2023年第7期65卷 1794-1813页

作者： Fanliang Meng Haoran Liu Songshen Hu Chengguo Jia Min Zhang Songwen Li Yuanyuan Li Jiayao Lin Yue Jian Mengyu Wang Zhiyong Shao Yuanyu Mao Lihong Liu Qiaomei Wang Key Laboratory of Horticultural Plant Growth and Development Ministry of AgricultureDepartment of HorticultureZhejiang UniversityHangzhou 310058China College of Plant Science Jilin UniversityChangchun 130062China

The plant hormone ethylene is essential for climacteric fruit ripening, although it is unclear how other phytohormones and their interactions with ethylene might affect fruit ripening. Here, we explored how brassinosteroids(BRs) regulate fruit ripening in tomato(Solanum lycopersicum) and how they interact with ethylene. Exogenous BR treatment and increased endogenous BR contents in tomato plants overexpressing the BR biosynthetic gene SlCYP90B3promoted ethylene production and fruit *** analysis indicated that the BR signaling regulators Brassinazole-resistant1(slbzr1) and BRI1-EMS-suppressor1(SlBES1) act redundantly in fruit softening. Knocking out Sl BZR1 inhibited ripening through transcriptome reprogramming at the onset of ripening. Combined transcriptome deep sequencing and chromatin immunoprecipitation followed by sequencing identified 73 Sl BZR1-repressed targets and 203 Sl BZR1-induced targets involving major ripening-related genes, suggesting that Sl BZR1 positively regulates tomato fruit *** BZR1 directly targeted several ethylene and carotenoid biosynthetic genes to contribute to the ethylene burst and carotenoid accumulation to ensure normal ripening and quality formation. Furthermore,knock-out of Brassinosteroid-insensitive2(Sl BIN2),a negative regulator of BR signaling upstream of Sl BZR1, promoted fruit ripening and carotenoid accumulation. Taken together, our results highlight the role of Sl BZR1 as a master regulator of tomato fruit ripening with potential for tomato quality improvement and carotenoid biofortification.

关键词： brassinosteroids carotenoids ethylene fruit ripening quality improvement SlBIN2 slbzr1 tomato

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