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Plant Physiol, July 2000, Vol. 123, pp. 883-894

Complementary Expression of Two Plastid-Localized sigma -Like Factors in Maize1

Sushmita D. Lahiri and Lori A. Allison*

Department of Biochemistry, University of Nebraska, N258 Beadle Center, Lincoln, Nebraska 68588-0664

The eubacterial-like RNA polymerase of plastids is composed of organelle-encoded core subunits and nuclear-encoded sigma -factors. Families of sigma -like factors (SLFs) have been identified in several plants, including maize (Zea mays) and Arabidopsis. In vitro import assays determined that at least two of the maize sigma -like proteins have functional chloroplast transit peptides and thus are likely candidates for chloroplast transcriptional regulators. However, the roles of individual SLFs in chloroplast transcription remain to be determined. We have raised antibodies against the unique amino-terminal domains of two maize SLFs, ZmSig1 and ZmSig3, and have used these specific probes to examine the accumulation of each protein in different maize tissues and during chloroplast development. The expression of ZmSig1 is tissue specific and parallels the light-activated chloroplast development program in maize seedling leaves. Its accumulation in mature chloroplasts however, is not affected by subsequent changes in the light regime. It is interesting that the expression profile of ZmSig3 is complementary to that of ZmSig1. It accumulates in non-green tissues, including roots, etiolated seedling leaves, and the basal region of greening seedling leaves. The nonoverlapping expression patterns of these two plastid-localized SLFs suggest that they may direct differential expression of plastid genes during chloroplast development.

1 This work was supported by the National Research Initiative Competitive Grants Program/U.S. Department of Agriculture (grant no. 97-35301-4514 to L.A.A.). This paper is journal series no. 12,820, Agricultural Research Division, University of Nebraska.

* Corresponding author; e-mail lallison1{at}unl.edu; fax 402-472-7842.

© 2000 American Society of Plant Physiologists


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