Puttamadanayaka, S and Emayavaramban, P and Yadav, P K and Radhakrishna, A and Mehta, B K and Chandra, A and Ahmad, S and Sanivarapu, H and Siddaiah, C N and Yogendra, K (2024) Unravelling the molecular mechanism underlying drought stress tolerance in Dinanath (Pennisetum pedicellatum Trin.) grass via integrated transcriptomic and metabolomic analyses. BMC Plant Biology, 24. pp. 1-18. ISSN 1471-2229
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Abstract
Dinanath grass (Pennisetum pedicellatum Trin.) is an extensively grown forage grass known for its significant drought resilience. In order to comprehensively grasp the adaptive mechanism of Dinanath grass in response to water deficient conditions, transcriptomic and metabolomics were applied in the leaves of Dinanath grass exposed to two distinct drought intensities (48-hour and 96-hour). Transcriptomic analysis of Dinanath grass leaves revealed that a total of 218 and 704 genes were differentially expressed under 48- and 96-hour drought conditions, respectively. The genes that were expressed differently (DEGs) and the metabolites that accumulated in response to 48-hour drought stress mainly showed enrichment in the biosynthesis of secondary metabolites, particularly phenolics and flavonoids. Conversely, under 96-hour drought conditions, the enriched pathways predominantly involved lipid metabolism, specifically sterol lipids. In particular, phenylpropanoid pathway and brassinosteroid signaling played a crucial role in drought response to 48- and 96-hour water deficit conditions, respectively. This variation in drought response indicates that the adaptation mechanism in Dinanath grass is highly dependent on the intensity of drought stress. In addition, different genes associated with phenylpropanoid and fatty acid biosynthesis, as well as signal transduction pathways namely phenylalanine ammonia-lyase, putrescine hydroxycinnamoyl transferase, abscisic acid 8’-hydroxylase 2, syntaxin-61, lipoxygenase 5, calcium-dependent protein kinase and phospholipase D alpha one, positively regulated with drought tolerance. Combined transcriptomic and metabolomic analyses highlights the outstanding involvement of regulatory pathways related to secondary cell wall thickening and lignin biosynthesis in imparting drought tolerance to Dinanath grass leaves. These findings collectively contribute to an enhanced understanding of candidate genes and key metabolites relevant to drought response in Dinanath grass. Furthermore, they establish a groundwork for the creation of a transcriptome database aimed at developing abiotic stress-tolerant grasses and major crop varieties through both transgenic and genome editing approaches.
| Item Type: | Article |
|---|---|
| Divisions: | Global Research Program - Accelerated Crop Improvement |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | Dinanath grass (Pennisetum pedicellatum Trin), Drought tolerance, Transcriptome sequencing, Metabolomics |
| Subjects: | Others > Drought Tolerance Others > Genetic Engineering |
| Depositing User: | Mr Nagaraju T |
| Date Deposited: | 15 Jan 2025 05:26 |
| Last Modified: | 15 Jan 2025 05:26 |
| URI: | http://oar.icrisat.org/id/eprint/12908 |
| Official URL: | https://link.springer.com/article/10.1186/s12870-0... |
| Projects: | UNSPECIFIED |
| Funders: | Science & Engineering Research Board (SERB), Government of India. |
| Acknowledgement: | We would like to thank ICAR-Indian Grassland and Fodder Research Institute Jhansi, India and ICRISAT, Hyderabad, India for providing facilities for conducting research and SERB, DST, Government of India for financial support. |
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