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

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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.

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Abbreviations

RNAi:

RNA interference

Osg1-RI:

RNAi construct of Osg1

PMC:

Pollen mother cell

IPTG:

Isopropyl beta-d-thiogalactopyranoside

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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).

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Correspondence to Guangcun He.

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Wan, L., Zha, W., Cheng, X. et al. A rice β-1,3-glucanase gene Osg1 is required for callose degradation in pollen development. Planta 233, 309–323 (2011). https://doi.org/10.1007/s00425-010-1301-z

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