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Type: Journal article
Title: A self-fertile mutant of phalaris produces an S protein with reduced thioredoxin activity
Author: Li, Xinmin
Nield, Jan
Hayman, David
Langridge, Peter
Citation: Plant Journal. 10(3):505-513
Issue Date: 1996
ISSN: 0960-7412
Statement of
Xinmin Li, Jan Nield, David Hayman, Peter Langridge
Abstract: Gametophytic self-incompatibility in the Phalaris coerulescens is controlled by two unlinked genes, S and Z. Isolation of the S gene from the pollen of this grass species indicated that the C terminus has significant hemology with thioredoxin H proteins. The protein from the C terminus, expressed in Escherichia coli, exhibits thioredoxin-like activity. This paper demonstrates that the C terminus of the S protein from an S complete mutant shows significant reduction in thioredoxin activity when compared with the wild-type form. Both pollen and stigma have lost self-incompatibility in this mutant. Close examination of the lesions, which were found only in the C terminus of the mutant gene suggests that the substitution of a serine by an arginine is responsible for the reduced enzymatic activity. The association between reduced activity and the loss of the self-incompatibility provides evidence for a role of thioredoxin activity in the self-incompatibility reaction of this species.
DOI: 10.1046/j.1365-313X.1996.10030505.x
Appears in Collections:Agriculture, Food and Wine publications

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