Moreover, the onset of plant senescence is invariably initiated by the changing levels of hormones, which are under systemic or environmental control. Prior to abscission, cells partition most of their cytoplasmic contents by the ingression of a cleavage furrow. In conclusion, researchers in Arabidopsis are using multiple approaches combining physiological, anatomical, biochemical, and molecular techniques to study abscission. Abscission is a controlled process of shedding of plant organs such as leaves, flower petals, whole flowers, fruit-lets, and even the stem. Abscission is the essential last step of the cell division process, which irreversibly splits post-mitotic sister cells (reviewed in Steigemann and Gerlich, 2009). It is one of the preprogrammed processes for plant gr owth and development. The shape and the quality of fruits are negatively affected by the presence of a persistent calyx. Currently, one approach to manipulate the abscission process in crop plants is the use of chemicals. Abscission is the process by which plants shed unwanted organs, either as part of a natural developmental program or in response to environmental stimuli. This stimulates the production and release cellulase enzymes in the abscission zone of the leaf. abscission is an urgent process characterized by the natural separation of organs from the plant body . The process of abscission is very important to the plant, especially for perennials, as it helps in diverting water and nutrients to the young leaves instead of old ones. In this work, we show that the last step of cytokinesis, termed abscission, is delayed in early zebrafish embryos. Similarly it is also a ‘self-pruning’ device through which developing young fruits and injured organs are shed from the parent plant. ‘Kuerlexiangli’ (Pyrus sinkiangensis Yu) is an important market pear in China. In the future, our knowledge on the molecular mechanisms regulating abscission might be used for biotechnologically based genetic manipulation. In this way, abscission is similar to other cell separation processes, such as dehiscence, lateral root emergence, and root cap sloughing. The process of abscission may trigger major changes that ultimately affect the expression or suppression of hundreds of genes. Another hormone, antagonistic to auxin, ethene is activated and then production increases. The process requires the formation of an anatomically distinct structure, the abscission zone (AZ), which constitutes the region where organs are detached from the plant body. Abscission is a cell separation process. Auxin levels in the leaf drop in response to a drop in cytokinin. 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