Abstract
Lipoxygenase (LOX) is a common enzyme which catalyzes lipid peroxidation of seeds and consequently enhances seed quality deterioration and decreases seed viability. During seed storage, peroxidation of unsaturated fatty acids occur due to enhancement of LOX activity which directly leads to reduction in seed vigour and deterioration of grain nutritional quality. This study was undertaken to overcome these problem during rice seed storage by attenuating LOX activity using RNAi technology. To improve seed storage stability, we down regulated LOX gene activity by using a functional fragment of the LOX gene under the control of both constitutive (CaMV35S) and aleurone-specific (Oleosin-18) promoter separately. To understand the storage stability, RNAi–LOX seeds and non-transgenic control seeds were subjected to accelerated aging at 45 °C and 85 % relative humidity for 14 days. Our studies demonstrate that down regulation of LOX activity reduces the seed quality deterioration under storage condition. In addition GC–MS analysis revealed that reduction of fatty acid level in non-transgenic seeds during storage was higher when compared with that of transgenic rice seeds. Furthermore, the transgenic rice seeds with reduced LOX activity exhibited enhanced seed germination efficiency after storage than that of non-transgenic rice seeds. This study will have direct impact on nutritional stability of quality rice grains.
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Abbreviations
- LOX:
-
Lipoxygenase
- MDA:
-
Malondialdehyde
- HNE:
-
Hydroxynonenal
- FFA:
-
Free fatty acid
- ROS:
-
Reactive oxygen species
- HPOD:
-
Hydroperoxyoctadecadienoic acid
- AA:
-
Accelerated aging
- RH:
-
Relative humidity
- EC:
-
Electric conductance
- AAS:
-
Atomic absorption spectroscopy
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Acknowledgments
We thankfully acknowledge Department of Biotechnology (DBT), Government of India for financial support in the form of DBT programme support (Sanction no. BT/01/COE/06/05) that made the research possible. We are thankful to the Leibniz Institute of Plant Genetics and Crop Plant Research, D–06466 Gatersleben, Germany for providing the pIPKb-006 and pIPKb-009 destination vectors. We thank Prof. S Muthukrishnan, Kansas State University, USA for reviewing and editorial support of the MS.
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Gayen, D., Ali, N., Ganguly, M. et al. RNAi mediated silencing of lipoxygenase gene to maintain rice grain quality and viability during storage. Plant Cell Tiss Organ Cult 118, 229–243 (2014). https://doi.org/10.1007/s11240-014-0476-6
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DOI: https://doi.org/10.1007/s11240-014-0476-6