Campus Units

Computer Science, Genetics, Development and Cell Biology, Plant Pathology and Microbiology, Plant Sciences Institute

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

10-2016

Journal or Book Title

The Plant Journal

Volume

88

Issue

2

First Page

193

Last Page

204

DOI

10.1111/tpj.13239

Abstract

The unfolded protein response (UPR) is activated by various stresses during vegetative development in Arabidopsis, but is constitutively active in anthers of unstressed plants. To understand the role of the UPR during reproductive development, we analyzed a double mutant, ire1a ire1b. The double mutant knocks out the RNA splicing arm of the UPR signaling pathway and is fertile at room temperature, but is male sterile at modestly elevated temperature (ET). The conditional male sterility in the mutant is a sporophytic trait, and when the double mutant was grown at ET, defects appeared in the structure of the tapetum. As a result, the tapetum in the double mutant failed to properly deposit the pollen coat at ET, which made pollen grains clump and prevented their normal dispersal. IRE1 is a dual protein kinase/ribonuclease involved in the splicing of bZIP60 mRNA, and through complementation analysis of various mutant forms of IRE1b, it was demonstrated that the ribonuclease activity of IRE1 was required for protecting male fertility from ET. It was also found that overexpression of SEC31A rescued the conditional male sterility in the double mutant. SEC31A is involved in ER to Golgi trafficking and a major target of the IRE1-mediated UPR signaling in stressed seedlings. Thus, IRE1, a major component of the UPR, plays an important role in protecting pollen development from ET.

Comments

This is the peer reviewed version of the following article: Deng, Yan, Renu Srivastava, Teagen D. Quilichini, Haili Dong, Yan Bao, Harry T. Horner, and Stephen H. Howell. "IRE 1, a component of the unfolded protein response signaling pathway, protects pollen development in Arabidopsis from heat stress." The Plant Journal 88, no. 2 (2016): 193-204, which has been published in final form at doi: 10.1111/tpj.13239. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

Copyright Owner

The Authors, The Plant Journal, John Wiley & Sons Ltd

Language

en

File Format

application/pdf

Published Version

Share

COinS