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Differential response of the photosynthetic machinery to dehydration in older and younger resurrection plants

Journal Article · · Journal of Experimental Botany
DOI:https://doi.org/10.1093/jxb/erab485· OSTI ID:1979500

Abstract

A group of vascular plants called homoiochlorophyllous resurrection plants evolved unique capabilities to protect their photosynthetic machinery against desiccation-induced damage. This study examined whether the ontogenetic status of the resurrection plant Craterostigma pumilum has an impact on how the plant responds to dehydration at the thylakoid membrane level to prepare cells for the desiccated state. Thus, younger plants (<4 months) were compared with their older (>6 months) counterparts. Ultrastructural analysis provided evidence that younger plants suppressed senescence-like programs that are realized in older plants. During dehydration, older plants degrade specific subunits of the photosynthetic apparatus such as the D1 subunit of PSII and subunits of the cytochrome b6f complex. The latter leads to a controlled down-regulation of linear electron transport. In contrast, younger plants increased photoprotective high-energy quenching mechanisms and maintained a high capability to replace damaged D1 subunits. It follows that depending on the ontogenetic state, either more degradation-based or more photoprotective mechanisms are employed during dehydration of Craterostigma pumilum.

Research Organization:
Washington State Univ., Pullman, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
SC0017160
OSTI ID:
1979500
Journal Information:
Journal of Experimental Botany, Vol. 73, Issue 5; ISSN 0022-0957
Publisher:
Oxford University Press
Country of Publication:
United States
Language:
English

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