Abstract
Main conclusion
Down-regulation of lipoxygenase enzyme activity reduces degradation of carotenoids of bio-fortified rice seeds which would be an effective tool to reduce huge post-harvest and economic losses of bio-fortified rice seeds during storage.
Bio-fortified provitamin A-enriched rice line (golden rice) expressing higher amounts of β-carotene in the rice endosperm provides vitamin A for human health. However, it is already reported that degradation of carotenoids during storage is a major problem. The gene responsible for degradation of carotenoids during storage has remained largely unexplored till now. In our previous study, it has been shown that r9-LOX1 gene is responsible for rice seed quality deterioration. In the present study, we attempted to investigate if r9-LOX1 gene has any role in degradation of carotenoids in rice seeds during storage. To establish our hypothesis, the endogenous lipoxygenase (LOX) activity of high-carotenoid golden indica rice seed was silenced by RNAi technology using aleurone layer and embryo-specific Oleosin-18 promoter. To check the storage stability, LOX enzyme down-regulated high-carotenoid T3 transgenic rice seeds were subjected to artificial aging treatment. The results obtained from biochemical assays (MDA, ROS) also indicated that after artificial aging, the deterioration of LOX-RNAi lines was considerably lower compared to β-carotene-enriched transgenic rice which had higher LOX activity in comparison to LOX-RNAi lines. Furthermore, it was also observed by HPLC analysis that down-regulation of LOX gene activity decreases co-oxidation of β-carotene in LOX-RNAi golden rice seeds as compared to the β-carotene-enriched transgenic rice, after artificial aging treatment. Therefore, our study substantially establishes and verifies that LOX is a key enzyme for catalyzing co-oxidation of β-carotene and has a significant role in deterioration of β-carotene levels in the carotenoid-enriched golden rice.
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Abbreviations
- LOX:
-
Lipoxygenase
- MDA:
-
Malondialdehyde
- ROS:
-
Reactive oxygen species
- VAD:
-
Vit-A deficiency
- DCFDA:
-
2′, 7′-Dichlorofluorescin diacetate
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Acknowledgments
We thankfully acknowledge Department of Biotechnology (DBT), Government of India (Sanction no. BT/01/COE/06/05) and DST-PURSE, University of Calcutta for financial support. We are also grateful to the Leibniz Institute of Plant Genetics and Crop Plant Research, D–06466 Gatersleben, Germany for providing the pIPKb-006 destination vector.
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Gayen, D., Ali, N., Sarkar, S.N. et al. Down-regulation of lipoxygenase gene reduces degradation of carotenoids of golden rice during storage. Planta 242, 353–363 (2015). https://doi.org/10.1007/s00425-015-2314-4
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DOI: https://doi.org/10.1007/s00425-015-2314-4