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RNAi-mediated male sterility of tobacco by silencing TA29

Abstract

The superior performance of F1 hybrids has a significant impact on agricultural productivity. For commercial application, the availability of an efficient system for obtaining male-sterile lines of crops is an essential prerequisite. Here we have investigated the use of RNA interference (RNAi) technology to silence a male-specific gene in the model host tobacco. TA29 is expressed exclusively in anthers at the time of microspore development. About 10 out of 13 tobacco lines transformed with a hairpin RNAi construct containing TA29 sequences were male sterile. Transgenic plants were phenotypically indistinguishable from non-transgenic plants. At the anthesis stage, pollen grains from transgenic, male-sterile plants were aborted and lysed in comparison to the round and fully developed pollen in non-transgenic plants. Microscopic analysis of anthers showed selective degradation of tapetum in transgenic plants with no microspore development. One week after self-pollination, the ovules of non-transgenic plants were double the size of those in transgenic plants, due to successful self-fertilization. Male sterile transgenic plants set seed normally, when cross-pollinated with pollen from non-transgenic plants, confirming no adverse effect on the female parts of the flower. These results show that silencing of male-specific genes by RNAi is potentially a useful tool for generating male-sterile lines for producing hybrid seed.

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Acknowledgements

This project was funded by the Pakistan Agricultural Research Council, Islamabad under the “Agriculture Linkage Program”. We are thankful to Dr. Rubina Tabassum for use of the light microscope, Mr. Javed Iqbal for assistance with microscopy and Dr. Richard Jorgenson for providing pFGC5941. RWB acknowledges the support of the Higher Education Commission (Pakistan) under the “Foreign Faculty Hiring Scheme”.

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Correspondence to Rob W. Briddon.

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Nawaz-ul-Rehman, M.S., Mansoor, S., Khan, A.A. et al. RNAi-mediated male sterility of tobacco by silencing TA29 . Mol Biotechnol 36, 159–165 (2007). https://doi.org/10.1007/s12033-007-0025-1

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Keywords

  • Anther
  • Hybrid
  • Male-sterility
  • Silencing
  • Tapetum