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Ultrastructure of Mesophyll Cells and Pigment Content in Senescing Leaves of Maize and Barley

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Abstract

Leaf senescence is a genetically regulated stage in the plant life cycle leading to death. Ultrastructural analysis of a particular region of the leaf and even of a particular mesophyll cell can give a clear picture of the time development of the process. In this study we found relations between changes in mesophyll cell ultrastructure and pigment concentration in every region of the leaf during leaf senescence in maize and barley. Our observations demonstrated that each mesophyll cell undergoes a similar senescence sequence of events: a) chromatin condensation, b) degradation of thylakoid membranes and an increase in the number of plastoglobules, c) damage to internal mitochondrial membrane and chloroplast destruction. Degradation of chloroplast structure is not fully correlated with changes in photosynthetic pigment content; chlorophyll and carotenoid content remained at a rather high level in the final stage of chloroplast destruction. We also compared the dynamics of leaf senescence between maize and barley. We showed that changes to the mesophyll cells do not occur at the same time in different parts of the leaf. The senescence damage begins at the base and moves to the top of the leaf. The dynamics of mesophyll cell senescence is different in leaves of both analyzed plant species; in the initial stages, the process was faster in barley whereas in the later stages the process occurred more quickly in maize. At the final stage, the oldest barley mesophyll cells were more damaged than maize cells of the same age.

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Correspondence to Agnieszka Mostowska.

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Kołodziejek, I., Kozioł, J., Wałęza, M. et al. Ultrastructure of Mesophyll Cells and Pigment Content in Senescing Leaves of Maize and Barley . J Plant Growth Regul 22, 217–227 (2003). https://doi.org/10.1007/s00344-002-0024-1

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  • DOI: https://doi.org/10.1007/s00344-002-0024-1

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