The color of tomato fruits is determined by carotenoids. The process involves removing chloroplast-related components and the biogenesis of chromoplast membranes where carotenoids are stored, but how these events are coordinated is unknown. Here, we demonstrated that part of this mechanism involves macroautophagy/autophagy playing dual roles in chromoplast transition and degradation. We have used fluorescence lifetime imaging microscopy (FLIM) to show that autophagosomes containing chloroplast-derived-vesicles increased significantly during early fruit ripening, which is an essential part of a pathway to the formation of chromoplasts. Interestingly, we also showed that autophagy controls the degradation of the chromoplasts containing carotenoids at the late ripening stage through a process we named chromophagy. This affects fruit color and ABA levels, which were higher in autophagy mutants with a slower turnover of chromoplasts. We concluded that autophagy is a determinant of both fruit coloration and ripening through degrading different plastid-related cargo.Abbreviation: ABA: abscisic acid; ATG: autophagy related; AP: autophagosome; BR: breaker stage; BRâ+â3: 3âdays after breaker stage; BRâ+â7: 7âdays after breaker stage; CV: coefficient of variation; FLIM: fluorescence lifetime imaging microscopy; IG: immature green; LR: light red; MG: mature green; PDVs: plastid-derived-vesicles; RhB: rhodamine B; RNAi: RNA interference; RR: ripe red; TEM: transmission electron microscopy; WLL: white-light laser.
Autophagy plays a dual role in chromoplast transition and degradation and is essential for fruit coloration and ripening.
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作者:Guo Ye, Bao Zhiru, Shi Meiyan, Zheng Qiwei, Huo Yawen, Hu Ran, Guan Yajie, Cao Saiyu, Hussey Patrick J, Deng Xiuxin, Cheng Yunjiang, Wang Pengwei
期刊: | Autophagy | 影响因子: | 14.300 |
时间: | 2025 | 起止号: | 2025 Sep;21(9):2058-2068 |
doi: | 10.1080/15548627.2025.2509330 |
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