During leaf senescence, chloroplasts are transformed into gerontoplasts. This process is characterized by changes in the ultrastructure and in the biochemical and functional properties of the plastids. Concomitantly, a decline in the cellular population of chloroplasts/gerontoplasts may occur. While gerontoplast differentiation to a certain extent is a reversible process, a reactivation of plastid division does not occur. A model depicting three different pathways by which chloroplasts may be degraded in senescing mesophyll cells is presented.
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Krupinska, K. (2007). Fate and Activities of Plastids During Leaf Senescence. In: Wise, R.R., Hoober, J.K. (eds) The Structure and Function of Plastids. Advances in Photosynthesis and Respiration, vol 23. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-4061-0_22
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