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| 1 | Hydrogen sulfide inhibits ethylene-induced petiole abscission in tomato(Solanum lycopersicum L.)显示文摘Abscission is a dynamic physiological process that is ubiquitous in plants and can also be an essential agronomic trait in crops,thus attracting attention from plant growers and breeders.In general,the process of plant organ abscission can be divided into four steps,among which the step to obtain the competence to respond to abscission signals(step 2)is the most complex;however,the molecular mechanism underlying this process remains unclear.In this study,we found that hydrogen sulfide(H_(2)S)inhibited the abscission of the tomato petiole in a dose-dependent manner,and the abscission of the petiole was accelerated when an H_(2)S scavenger was applied.Further enzymatic activity and gene expression analyses showed that H_(2)S suppressed the activity of enzymes capable of modifying the cell wall by inhibiting the usual upregulation of the transcription of the corresponding genes during the abscission process but not by affecting the activities of these enzymes by direct posttranslational modification.H_(2)S treatment upregulated the expression levels of SlIAA3 and SlIAA4 but downregulated the transcription of ILR-L3 and ILR-L4 in the earlier stages of the abscission process,indicating that H_(2)S probably functioned in the second step of the abscission process by preventing the abscission zone cells from obtaining the competence to respond to abscission signals by modulating the content of the bioactive-free auxin in these cells.Moreover,similar H_(2)S inhibitory effects were also demonstrated in the process of floral organ abscission and anther dehiscence in other plant species,suggesting a ubiquitous role for H_(2)S in cell separation processes. | Danmei Liu Jianing Li Zhuowen Li Yanxi Pei | 2020 | Horticulture Research2020，7，1： | 4 |
| 2 | 果树器官脱落的研究进展显示文摘器官脱落是植物通过可控方式将某一器官与母体分离的过程,在植物界普遍发生,也是果树重要的农艺性状。器官脱落发生的位置称为离区,离区的发育是多种基因参与的精细而复杂的调控过程。本文通过总结近年来对果树器官脱落的研究报道,在生理生化和分子机制方面阐述了果树器官脱落最新研究进展,以期提高对器官脱落的理解,为进一步深入研究果树脱落机理提供思路与参考。 | 郝紫微 吴潇 刘哲 谢智华 张绍铃 王鹏 | 2020 | 江苏农业科学2020，48，16： | 2 |
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