Authors Affiliation(s)
- 1Department of Botany, Savitribai Phule Pune University, Pune 411007, INDIA
- 2Vilasrao Deshmukh Agricultural Biotechnology College, Latur, INDIA
Can J Biotech, Volume 1, Special Issue, Page 169, DOI: https://doi.org/10.24870/cjb.2017-a155
Presenting and *Corresponding author: kirankhandagale253@gmail.com
Abstract
Fragrance of rice is one of the most valued grain quality character thus, fetches much higher market price. 2-Acetyl-1-Pyrroline (2AP) is major aroma compound found in all parts of plant except root in scented rice. Classical and molecular genetics analyses revealed that a single recessive gene betaine aldehyde dehydrogenase 2 (Osbadh2) is responsible for expression of 2AP in scented rice. Present study was aimed at inducing expression of 2AP in non-scented indica rice cultivar IR-64 by silencing OsBADH2 via RNAi technique. The regeneration protocol for IR 64 was optimised, 2, 4-D (MS + 2 mg/L) for callus induction, BAP (2.5 mg/L) for shoot induction and half MS supplemented with 0.1 mg/L NAA was found optimum for rooting. A vector pBSK was used for construction of RNAi cassette and pRI101-ON as a binary vector. Agrobacterium (GV3101) mediated transformation was done using embryogenic calli of IR-64 and transgenic calli were selected on MS medium containing kanamycin (250 mg/L). Gas chromatography analyses showed significant amount of 2AP (0.05 ppm) production in RNAi callus. The content of precursors, proline and methylglyoxal were not varied but GABA content was found to be reduced in RNAi callus (5.1±0.03 µg/g) than control (6.4±0.05 µg/g). Further transgenic calli showed 7 fold reduction in expression of BADH2 transcript. The transgenic calli have been regenerated and transformed plants are under observation for further transcriptome analysis and 2AP quantification in seeds. The study demonstrated that RNAi approach could be successfully used for imparting pleasant aroma character in non-scented rice cultivars.
References
- Kaikavoosi, K., Kad, T.D., Zanan, R.L. and Nadaf, A.B. (2015) 2-Acetyl-1-Pyrroline Augmentation in Scented indica Rice (Oryza sativa L.) Varieties Through Δ1-Pyrroline-5-Carboxylate Synthetase (P5CS) Gene Transformation. Appl Biochem Biotechnol 177: 14661479. Crossref
- Hinge, V.R., Patil, H.B. and Nadaf, A.B. (2016) Aroma volatile analyses and 2AP characterization at various developmental stages in Basmati and Non-Basmati scented rice (Oryza sativa L.) cultivars. Rice (N Y) 9: 38.Crossref
- Wakte, K., Zanan, R., Hinge, V., Khandagale, K., Nadaf, A. and Henry, R. (2016) Thirty-three years of 2-acetyl-1-pyrroline, a principal basmati aroma compound in scented rice (Oryza sativa L.): a status review. J Sci Food Agric 97: 384-395. Crossref undefined undefined
- Bradbury, L.M., Gillies, S.A., Brushett, D.J., Waters, D.L.E. and Henry, R.J. (2008) Inactivation of an aminoaldehyde dehydrogenase is responsible for fragrance in rice. Plant Mol Biol 68: 439449. Crossref