PMID: 19915740Nov 17, 2009Paper

The relationship between leaf rolling and ascorbate-glutathione cycle enzymes in apoplastic and symplastic areas of Ctenanthe setosa subjected to drought stress

Biological Research
Neslihan SaruhanAsim Kadioğlu

Abstract

The ascorbate-glutathione (ASC-GSH) cycle has an important role in defensive processes against oxidative damage generated by drought stress. In this study, the changes that take place in apoplastic and symplastic ASC-GSH cycle enzymes of the leaf and petiole were investigated under drought stress causing leaf rolling in Ctenanthe setosa (Rose.) Eichler (Marantaceae). Apoplastic and symplastic extractions of leaf and petiole were performed at different visual leaf rolling scores from 1 to 4 (1 is unrolled, 4 is tightly rolled and the others are intermediate forms). Glutathione reductase (GR), a key enzyme in the GSH regeneration cycle, and ascorbate (ASC) were present in apoplastic spaces of the leaf and petiole, whereas dehydroascorbate reductase (DHAR), which uses glutathione as reductant, monodehydroascorbate reductase (MDHAR), which uses NAD(P)H as reductant, and glutathione were absent. GR, DHAR and MDHAR activities increased in the symplastic and apoplastic areas of the leaf. Apoplastic and symplastic ASC and dehydroascorbate (DHA), the oxidized form of ascorbate, rose at all scores except score 4 of symplastic ASC in the leaf. On the other hand, while reduced glutathione (GSH) content was enhanced, oxidized glutathione (G...Continue Reading

Citations

Oct 9, 2012·Trends in Plant Science·Kai Xun ChanBarry J Pogson
Nov 29, 2011·Plant Science : an International Journal of Experimental Plant Biology·Asim KadiogluAykut Saglam
Apr 14, 2016·Biochemical and Biophysical Research Communications·Bhaba Krishna DasArulandu Arockiasamy
May 4, 2017·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Mirza HasanuzzamanMasayuki Fujita

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