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Evidence for the presence of photorespiration in desiccation-sensitive leaves of the C4 'resurrection' plant Sporobolus stapfianus during dehydration stress.

Abstract：

:The possible role of photorespiration as a general stress protection mechanism, and in C(4) plant metabolism, is controversial. In particular, the potential involvement of photorespiration in the acquisition of desiccation tolerance in 'resurrection' plants is unknown. An investigation was carried out into whether photorespiration is present in leaves of the C(4) resurrection plant Sporobolus stapfianus Gandoger (Poaceae) and whether it functions as a mechanism of stress resistance in the desiccation-tolerant younger leaves (YL) of this plant. It is shown that the enzymes involved in the photorespiratory pathway maintain their activity until 88% relative water content (RWC) in both YL and desiccation-sensitive older leaves (OL). In subsequent stages of dehydration stress, the enzymatic activity declined similarly in both YL and OL. The content of the phorespiratory metabolite, serine, and ethanolamine, a direct product of serine decarboxylation, is higher in the early stages of dehydration (88% RWC) in OL, suggesting a transiently enhanced photorespiratory activity in these leaves. This was confirmed by simultaneous gas exchange and fluorescence measurements, showing suppression of the electron transport rate in OL exposed to non-photorespiratory conditions (2% O(2)) at 85% RWC. It is concluded that a higher photorespiratory electron transport occurs in desiccation-sensitive OL, and it is therefore proposed that the capacity to scavenge excess electrons through photorespiration does not contribute to protect leaves of the desiccation-tolerant YL of S. stapfianus during the stress.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Martinelli T,Whittaker A,Masclaux-Daubresse C,Farrant JM,Brilli F,Loreto F,Vazzana C

doi

10.1093/jxb/erm247

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

3929-39

issue

14

eissn

0022-0957

issn

1460-2431

pii

erm247

journal_volume

58

pub_type

杂志文章

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