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Planta

, Volume 233, Issue 2, pp 309–323 | Cite as

A rice β-1,3-glucanase gene Osg1 is required for callose degradation in pollen development

  • Linglin Wan
  • Wenjun Zha
  • Xiaoyan Cheng
  • Chuan Liu
  • Lu Lv
  • Caixiang Liu
  • Zhanqi Wang
  • Bo Du
  • Rongzhi Chen
  • Lili Zhu
  • Guangcun He
Original Article

Abstract

Plant β-1,3-glucanases are involved in plant defense and development. In rice (Oryza sativa), 14 genes encoding putative β-1,3-glucanases have been isolated and sequenced. However, only limited information is available on the function of these β-1,3-glucanase genes. In this study, we report a detailed functional characterization of one of these genes, Osg1. Osg1 encodes a glucanase carrying no C-terminal extension. Osg1 was found to be expressed throughout the plant and highly expressed in florets, leaf sheaths, and leaf blades. Investigations using real-time PCR, immunocytochemical analysis, and a GUS-reporter gene driven by the Osg1 promoter indicated that Osg1 was mainly expressed at the late meiosis, early microspore, and middle microspore stages in the florets. To elucidate the role of Osg1, we suppressed expression of the Osg1 gene by RNA interference in transgenic rice. The silencing of Osg1 resulted in male sterility. The pollen mother cells appeared to be normal in Osg1-RI plants, but callose degradation was disrupted around the microspores in the anther locules of the Osg1-RI plants at the early microspore stage. Consequently, the release of the young microspores into the anther locules was delayed, and the microspores began to degenerate later. These results provide evidence that Osg1 is essential for timely callose degradation in the process of tetrad dissolution.

Keywords

Rice (Oryza sativaβ-1,3-Glucanase Callose Tetrad Pollen development Male sterility 

Abbreviations

RNAi

RNA interference

Osg1-RI

RNAi construct of Osg1

PMC

Pollen mother cell

IPTG

Isopropyl beta-d-thiogalactopyranoside

Notes

Acknowledgments

This research work was supported by grants from the National Natural Science Foundation of China (30730062), and the National Special Key Project on Functional Genomics and Biochips (2006AA10A103).

Supplementary material

425_2010_1301_MOESM1_ESM.pdf (235 kb)
Supplementary material (PDF 236 kb)

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Linglin Wan
    • 1
  • Wenjun Zha
    • 1
  • Xiaoyan Cheng
    • 1
  • Chuan Liu
    • 1
  • Lu Lv
    • 1
  • Caixiang Liu
    • 1
  • Zhanqi Wang
    • 1
  • Bo Du
    • 1
  • Rongzhi Chen
    • 1
  • Lili Zhu
    • 1
  • Guangcun He
    • 1
  1. 1.Key Laboratory of Ministry of Education for Plant Development Biology, College of Life SciencesWuhan UniversityWuhanPeople’s Republic of China

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